Difference between revisions of "Commissioning Plan 2017"

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−
== Magnet Field Setting ==
+
=[[Hall C One pass commissioning plan | Beam energy of 2.2 GeV ]]=
  
−
=== HMS ===
+
= Beam energy of 6.4 GeV =
−
* ALWAYS set DIPOLE by NMR coming DOWN from 900 A <span style="color:red">- still true?</span>
+
== Initial conditions ==  
−
* Set QUADS by initially setting to a current of 200 A above the set currents (or the maximum current of 1100 A for Q1 if set current + 200 > 1100), and then coming DOWN.
+
* HMS/SHMS Conditions:
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! HMS/SHMS collimator: || PION , COLLIMATOR
 +
|-
 +
! HMS/SHMS trigger: || SCIN 3/4, SCIN 3/4
 +
|-
 +
! HMS angle/momentum  || 15 deg, -3.0 GeV/c
 +
|-
 +
! SHMS angle/momentum  || 15 deg, -3.0 GeV/c
 +
|}
  
−
=== SHMS ===
+
== Beam Checkout with Superharps and Beam Position Monitors (3 hours) ==
−
* Set HB magnet to 1500 A and then go up or down setting HB by NMR
+
* Experts: Mark Jones, Deb Biswas, Thir Guatam
−
* Set QUADS … <span style="color:red">- need Q1 mapping data in form we can decide on this</span>
+
* Expected time: 3 hours
 +
* Goals: Initial measurement of beam spot size. Followed by calibration of girder BPMs at 5,30 and 60uA. Measure raster size with superharps.
 +
* Conditions:
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current:  || 5,30 and 60 μA
 +
|-
 +
! fast raster: || off
 +
|-
 +
! target: || none
 +
|}
 +
*Runplan: [https://github.com/MarkKJones/fall2017-plans/blob/master/beam-checkout-superharps-bpms/beam-checkout-superharps-bpms.pdf pdf file]
 +
* Ask MCC to do superharp scan with superharps IHA3H07A and IHA3H07B and put entry in ELOG. Record the 3 BPMs positions (3H07A,3H07B,3H07C) during scan.
 +
** Want beam spot  with  sigma_x and sigma_y below 200 um ( beam pass 1-4) and below 300 um for beam pass 5.
 +
* Verify Girder BPM position to Harp positions.
  
−
Set DIPOLE by NMR (or with Hall Probe at highest momentum settings, not relevant for this commissioning plan) …
+
== Center beam  on C-hole target ( 1 hour)==
 +
* Experts:
 +
* Expected time: 1 hour
 +
* Goal: Center beam on carbon hole target
 +
* Conditions:
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current:  || 5 μA
 +
|-
 +
! fast raster: || 3x3mm
 +
|-
 +
! target: || carbon hole
 +
|-
 +
! HMS/SHMS collimator: || PION , COLLIMATOR
 +
|-
 +
! HMS/SHMS trigger: || SCIN 3/4, SCIN 3/4
 +
|-
 +
! HMS angle/momentum  || 15 deg, -3.0 GeV/c
 +
|-
 +
! SHMS angle/momentum || 15 deg, -3.0 GeV/c
 +
|}
 +
* Run plan: [https://hallcweb.jlab.org/wiki/index.php/Beam_Checkout_Procedures  Procedure]
 +
* Once hole is found, take 20 minutes run at 20uA for good statistics
  
−
== Beam Energy and Equipment Assumption ==
+
== Detailed Detector Checkout ( 2 hour)==
 +
* Experts:
 +
* Expected time: 2 hour
 +
* Prerequisite: Eric Pooser will do invasive checkout of HMS/SHMS trigger with beam.
 +
* Conditions:
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current:  || 20 μA
 +
|-
 +
! fast raster: || off
 +
|-
 +
! target: || 0.5% carbon
 +
|-
 +
! HMS/SHMS collimator: || PION , COLLIMATOR
 +
|-
 +
! HMS/SHMS trigger: || SCIN 3/4,SCIN 3/4
 +
|-
 +
! HMS angle/momentum  || 15 deg, -3.0 GeV/c
 +
|-
 +
! SHMS angle/momentum  || 15 deg, -3.0 GeV/c
 +
|}
 +
=== Trigger ===
 +
*Set HMS/SHMS trigger threshold for PID trigger section to 10 mV.
 +
*Software cuts can be placed on trigger ADC data to study efficiencies.
  
−
Hall C Pre-Ops presumably will start at beam energy above 6 GeV (3-pass or 4-pass) as first order one needs to prove the Key Performance Parameters are met. This means also the noble gas Cherenkov is in place. As soon as data is collected for this Cherenkov to validate the detector being operational (i.e., seeing signals fulfilling the Key Performance Parameters), we need to remove this detector and replace by the alternate SHMS vacuum extension, to reduce multiple scattering before the focal plane. This would require removal of some roof blocks and tech assistance. Beyond the >6 GeV checkout for most of the detector and spectrometer optics studies, we will also need about one day of one-pass beam energy, assumed to be in the 2.0-2.2 GeV range, to measure the dispersion matrix elements of the SHMS with a Carbon elastic scan.
+
=== Cerenkov ===
 +
* SHMS Noble Gas Run Plan: Scan of HV ( Eric Pooser)
 +
Run 1 HV Settings: PMT1 = 2200 V, PMT2 = 2230 V, PMT3 = 2115, PMT4 = 2030
 +
Run 2 HV Settings: PMT1 = 2300 V, PMT2 = 2320 V, PMT3 = 2215, PMT4 = 2130
 +
** These are the spring 2017 KPP HV settings for reference:  NGC1 : 2255 V, NGC2 : 2280 V, NGC3 : 2165 V, NGC4 : 2087 V
 +
** We will also need to check the NGCER sum the PID trigger circuit to ensure that we are not saturating the FADC channel
  
−
= Beam Energy > 6 GeV =
+
*Run plan (series of 15 minutes runs)
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! Run  || HMS DAQ  || SHMS DAQ || Comments
 +
|-
 +
! 1    || No data taking  ||  Only 3/4 scin trigger || Checkout of HMS 3/4 trigger ; SHMS NGC HV NGC1 : 2255 V, NGC2 : 2280 V, NGC3 : 2165 V, NGC4 : 2087 V
 +
|-
 +
!  2 || Only 3/4 scin trigger || No data taking ||Checkout of SHMS 3/4 trigger
 +
  |-
 +
  ! 3  || Only 3/4 scin trigger ||  Only 3/4 scin trigger  || Checkout of HMS ELCLEAN/ELREAL trigger; SHMS NGC HV PMT1 = 2200 V, PMT2 = 2230 V, PMT3 = 2115, PMT4 = 2030
 +
|-
 +
! 4  || Only 3/4 scin trigger ||  Only 3/4 scin trigger  || Checkout of HMS ELCLEAN/ELREAL trigger ; SHMS NGC HV PMT1 = 2300 V, PMT2 = 2320 V, PMT3 = 2215, PMT4 = 2130
 +
|-
 +
! 5  || Only ELCLEAN trigger ||  Only 3/4 scin trigger  || Checkout of SHMS ELCLEAN/ELREAL trigger
 +
|-
 +
! 6   || Only ELREAL trigger ||  Only 3/4 scin trigger  || Checkout of SHMS ELCLEAN/ELREAL trigger
 +
|-
 +
! 7  || ELREAL trigger, prescale 3/4 SCIN ||  Only ELCLEAN  ||
 +
|-
 +
! 8  || ELCLEAN trigger, prescale 3/4 SCIN ||  Only ELREAL ||
 +
|-
 +
! 9  || ELCLEAN trigger, different prescale 3/4 SCIN ||  ELREAL, prescale 3/4 scin ||
 +
|-
  
−
  beam energy : > 6 GeV (3- or 4-pass)
+
|}
−
  beam current : 10 μA
 
−
  beam raster : 1 x 1 mm²
 
−
 
 
−
  target : central carbon
 
−
 
 
−
  HMS angle : 15°
 
−
  HMS momentum : -3 Gev/c
 
−
  HMS collimator : large
 
−
 
 
−
  SHMS angle : 15°
 
−
  SHMS momentum : -3 Gev/c
 
−
  SHMS collimator : large
 
  
−
== Check Electronics and Detector Functionality ==
+
== Checkout of SHMS/HMS focal plane tune ( 1 hour)==
 +
* Experts:
 +
* Expected time: 1 hour
 +
* Goal: Look at focal plane with sieve to check tune
 +
* Conditions:
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current:  || 20 μA
 +
|-
 +
! fast raster: || off
 +
|-
 +
! target: || 0.5% carbon
 +
|-
 +
! HMS/SHMS collimator: || SIEVE , Centered sieve
 +
|-
 +
! HMS/SHMS trigger: || SCIN 3/4,SCIN 3/4
 +
|-
 +
! HMS angle/momentum  || 15 deg, -3.0 GeV/c
 +
|-
 +
! SHMS angle/momentum  || 15 deg, -3.0 GeV/c
 +
|}
  
−
Set the spectrometer magnets to the initial settings as calculated with the <span style="color:red">FIELD_12GEV (has a start been made already?)</span> program. This can be done before any optics fine-tuning of the quadrupoles/optics as the initial detector checkout can occur with a defocused run (in fact, it is preferred). Start at a spectrometer angle of 15 degrees and a central momentum of -3.0 GeV/c (assuming >6 GeV beam energy, if this would be one-pass beam energy choose -1.0 GeV/c). Use a current of about 10 μA, the central (Carbon) target of the optics target, and the fast raster with a size of 1 by 1 mm2. Use the large (pion or HMS-100 for HMS) collimators. Check that all electronics signals are well timed. Determine correct thresholds. Verify that all detector channels are counting. At this time checkoff the '''Initial Detector Checkout Plan''' (“near-final” for HMS, initial for SHMS to check off Key Performance Parameters) to make sure all detectors are operational. Check carefully that all wire chamber channels are cabled up correctly. Verify all scalers are incrementing. Check for double pulsing and time the wire chamber signals. Determine the scintillator plane efficiency for detecting electrons with the correct discriminator threshold, and make sure that the scintillator signals for detecting hadrons are on scale in the scintillator ADCs.
+
== Different Pi/e ratios ( 1.5 hour)==
 +
* Experts: SImona
 +
* Expected time: 1.5 hr
 +
* Goal:
 +
**Runs with different central momentum and different pi/e ratios.
 +
**Two runs with LH2 and one with LD2
 +
**Take each setting with only 3/4 scin trigger and for 30 minutes
 +
** Set PID tirgger thresholds to 10 mV. Offline will determine thresholds to test later.
 +
* Conditions:
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current:  || 5-20 μA
 +
|-
 +
! fast raster: || 2x2mm
 +
|-
 +
! target: || 10cm LH2, 10cm LD2
 +
|-
 +
! HMS/SHMS collimator: || Pion/Collimator
 +
|-
 +
! HMS/SHMS trigger: || SCIN 3/4 /  SCIN 3/4
 +
|-
 +
! SHMS/HMS angle/momentum || 25. deg, -3.0 GeV/c, -1.4
 +
|}
 +
* Run Plan
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! HMS angle/mom || SHMS angle/mom || Target  || HMS/SHMS Trigger
 +
|-
 +
! 25./-3.0 || 25./-3.0 || 10cm LH2  || Only 3/4 scin
 +
|-
 +
! 25./-1.4 || 25./-1.4 || 10cm LH2  || Only 3/4 scin
 +
|-
 +
! 25./-1.4 || 25./-1.4 || 10cm LD2  || Only 3/4 scin
 +
  |}
  
−
== Beam Checkout with Superharps and Beam Position Monitors ==
+
== Defocused Tune for SHMS/HMS ( 1 hour)==
 +
* Experts: Hamlet
 +
* Expected time: 1 hr
 +
* Goal: Have a wider y_fp to calibrate the calorimeter over regions that are not usually hit with the standard hourglass tune.
 +
* Conditions:
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current:  || 5-20 μA
 +
|-
 +
! fast raster: || 2x2mm
 +
|-
 +
! target: || 10cm LH2
 +
|-
 +
! HMS/SHMS collimator: || Pion/Collimator
 +
|-
 +
! HMS/SHMS trigger: || SCIN 3/4 /  SCIN 3/4
 +
|-
 +
! SHMS/HMS angle/momentum  || 25. deg, -3.0 GeV/c, Q2 at 1.2 times normal
 +
|}
 +
*Run Plan:[https://github.com/MarkKJones/fall2017-plans/tree/master/defocused-tune Documents]
  
−
Since the beam line has drastically changed with respect to the 6-GeV beam operations we need to establish the nominal settings for the beam position at the last BPMs before the target. This can be done before or after the initial HMS checkout but should be done before the optics tuning of the SHMS.  
+
== Elastic p(ep) Checkout Small angle (2 hours) ==
 +
* Experts:
 +
* Expected time:
 +
* Goal:
 +
* Conditions:
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current:  || 10 μA
 +
|-
 +
! fast raster: || 1x1mm2
 +
|-
 +
! target: || 10cm LH2
 +
|-
 +
! HMS/SHMS collimator: || PION , COLLIMATOR
 +
|-
 +
! HMS/SHMS trigger: || SCIN 3/4, SCIN 3/4
 +
|-
 +
! HMS angle/momentum  || 13.5/16. deg / 5.398/5.074 GeV
 +
|-
 +
! SHMS angle/momentum  || 8.,10.,13.5 deg / 6.017,5.814,5.398 GeV
 +
|}
 +
*Run plan
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! HMS Angle/Mom || HMS rate  || SHMS Angle/Mom  || SHMS rate  || Run time
 +
|-
 +
! 13.5/5.398    ||  300      ||  8./6.017      || 3300 Hz        || 15 minutes
 +
|-
 +
! 13.5/5.398    ||  300      ||  10./5.817      || 1000        || 30 minutes
 +
|-
 +
! 16.0/5.074    ||  100      ||  13.5/5.398      || 150        || 60 minutes
 +
|}
  
−
=== Superharp Scan ===
+
== HMS/SHMS Angle and Position Matrix Optimization (5 hours)==
 +
* Experts:
 +
* Expected time: 5 hours.
 +
* Goal:
 +
* Conditions:
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current:  || 20 μA ( more is better)
 +
|-
 +
! fast raster: || off
 +
|-
 +
! target: || optics targets
 +
|-
 +
! HMS/SHMS collimator: || Sieve , Centered/Shifted Sieve
 +
|-
 +
! HMS/SHMS trigger: || 3/4 scin, 3/4 scin
 +
|-
 +
! HMS angle/momentum  || 15 and 22. deg,
 +
|-
 +
! SHMS angle/momentum  || 15. and 22. deg,
 +
|}
 +
*Series of runs changing target.
 +
**SHMS has two sieves with the holes shifted in the horizontal.
 +
**HMS has only one sieve which will always be used.
 +
** No raster.
 +
** Time is assuming 20uA.
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! Target  || HMS angle || HMS momentum || SHMS angle || SHMS momentum  || SHMS collimator || Time
 +
|-
 +
! 0,+/- 10cm || 15. deg ||  -4.0|| 15. deg ||  -4.0 || Centered Sieve || 30 min
 +
|-
 +
! 0,+/- 10cm || 15. deg ||  -4.0|| 15. deg ||  -4.0 || Shifted Sieve || 30 min
 +
|-
 +
! +/- 5cm || 15. deg ||  -4.0|| 15. deg ||  -4.0 || Centered Sieve || 30 min
 +
|-
 +
! +/- 5cm || 15. deg ||  -4.0|| 15. deg ||  -4.0 || Shifted Sieve || 30 min
 +
|-
 +
! 0,+/- 10cm || 22. deg ||  -3.2|| 22. deg ||  -3.2 || Centered Sieve || 1.5 hr
 +
|-
 +
! 0,+/- 10cm || 22. deg ||  -3.2|| 22. deg ||  -3.2 || Shifted Sieve || 1.5 hr
 +
|}
  
−
  beam current : 2 μA
+
== Large Ytar: HMS/SHMS Angle and Position Matrix Optimization (9 hours)==
−
  beam raster : off
+
* Experts:
−
 
+
* Expected time: 9 hours.
−
  target : none, or central carbon
+
* Goal:
 +
* Conditions:
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current: || 20 μA
 +
|-
 +
! fast raster: || off
 +
|-
 +
! target: || optics targets
 +
|-
 +
! HMS/SHMS collimator: || Sieve , Centered Sieve
 +
|-
 +
! HMS/SHMS trigger: || 3/4 scin, 3/4 scin
 +
|-
 +
! HMS angle/momentum  || 30. deg, -2.0 GeV/c
 +
|-
 +
! SHMS angle/momentum  || 30. deg, -2.0 GeV/c
 +
|}
 +
*
 +
== Check of ELREAL/ELCLEAN Trigger ( 1.5 hour)==
 +
* Experts: SImona
 +
* Expected time: 1.5 hr
 +
* Goal:
 +
** Use threshold determined form previous LD2 running
 +
**Sanity check of electron triggers. 
 +
* Conditions:
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current:  || 20 μA
 +
|-
 +
! fast raster: || 2x2mm
 +
|-
 +
! target: || 10cm LH2
 +
|-
 +
! HMS/SHMS collimator: || Pion/Collimator
 +
|-
 +
! HMS/SHMS trigger: || Electron triggers
 +
|-
 +
! SHMS/HMS angle/momentum  || 25. deg, -3.0 GeV/c, -1.4
 +
|}
  
−
Make sure there is no target in the beam line, or the central carbon target that can also handle unrastered beam. Take a superharp scan with fast raster off (2 μA current) with superharps IHA3H07A and IHA3H07B. Verify that the beam size is as expected – this was <math>\sigma_x \approx 80 \mu m</math>, <math>\sigma_y \approx 150 \mu m</math> under 6-GeV conditions, as long as it is roughly <math>200 \mu m</math> or better in both directions it should be good enough to proceed.
+
* Run Plan
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! HMS angle/mom || SHMS angle/mom || Target  || HMS/SHMS Trigger || Total DAQ Triggers
 +
|-
 +
! 25./-3.0 || 25./-3.0 || 10cm LH2  || Only 3/4 scin (prescale trig1=0,trig2=-1,trig3=-1) || 300K
 +
|-
 +
! 25./-3.0 || 25./-3.0 || 10cm LH2  || ELREAL (prescale trig1=-1,trig2=0,trig3=-1)  || 300K
 +
|-
 +
! 25./-3.0 || 25./-3.0 || 10cm LH2  || ELCLEAN (prescale trig1=-1,trig2=-1,trig3=0)  || 300K
 +
  |-
 +
! 25./-1.4 || 25./-1.4 || 10cm LH2  || Only 3/4 scin (prescale trig1=0,trig2=-1,trig3=-1) || 300K
 +
|-
 +
! 25./-1.4 || 25./-1.4 || 10cm LH2  || ELREAL (prescale trig1=-1,trig2=0,trig3=-1) || 300K
 +
|-
 +
! 25./-1.4 || 25./-1.4 || 10cm LH2  || ELCLEAN (prescale trig1=-1,trig2=-1,trig3=0)  || 300K
 +
|}
 +
== Coincidence Checkout [9 hrs] ==
 +
* Experts:
 +
* Expected time:
 +
* Goal:
 +
* Conditions:
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current:  || 20-50 μA
 +
|-
 +
! fast raster: || 2x2 mm2
 +
|-
 +
! target: || 10cm LH2
 +
|-
 +
! HMS/SHMS collimator: || PION/SIEVE , COLLIMATOR/CENTERED SIEVE
 +
|-
 +
! HMS/SHMS trigger: || SCIN 3/4, SCIN 3/4
 +
|-
 +
! HMS angle/momentum  || 27.5 deg, -3.609 GeV/c
 +
|-
 +
! SHMS angle/momentum  || 27.5 deg, +3.609 GeV/c
 +
|}
 +
* Series of runs with/without collimator on electron side and switch polarities between HMS/SHMS.
 +
* Last run is used to evaluate accidentals.
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! HMS angle || HMS momentum  || SHMS angle || HMS collimator || SHMS momentum  || SHMS collimator || Time
 +
|-
 +
! 27.5  deg ||  +3.609      || 27.5 deg || Pion  ||  -3.609 || Collimator || 30 min (4Hz at 20uA)
 +
|-
 +
! 27.5  deg ||  +3.609      || 27.5 deg || Pion  ||  -3.609 || Centered Sieve || 2 hr
 +
|-
 +
! 27.5  deg ||  -3.609      || 27.5 deg || Pion  ||  +3.609 || Collimator || 30 min (4Hz at 20uA)
 +
|-
 +
! 27.5  deg ||  -3.609      || 27.5 deg || Sieve  ||  +3.609 || Collimator || 2 hr
 +
|-
 +
  ! 27.5  deg ||  -3.609      || 35.0 deg || Pion  ||  +3.609 || Collimator || 1 hr
 +
|}
  
−
=== Last Beam Line Girder Commissioning ===
+
== Additional Large Ytar: HMS/SHMS Angle and Position Matrix Optimization (6 hours)==
 +
* Experts:
 +
* Expected time: 6 hours.
 +
* Goal:
 +
* Conditions:
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current:  || 65 μA
 +
|-
 +
! fast raster: || 2x2
 +
|-
 +
! target: || optics targets
 +
|-
 +
! HMS/SHMS collimator: || Sieve , Centered Sieve
 +
|-
 +
! HMS/SHMS trigger: || 3/4 scin, 3/4 scin
 +
|-
 +
! HMS angle/momentum  || 25.5,22 deg, -2.6,-3.2 GeV/c
 +
|-
 +
! SHMS angle/momentum  || 30.,22 deg, -2.0,-3.2 GeV/c
 +
|}
 +
*Run Plan:  Time is assuming 65uA. Take one hour long runs. Should take about 5 hours for +/-10cm data and 1 hour for +/-5cm data.
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! Target  || HMS angle || HMS momentum || SHMS angle || SHMS momentum  || SHMS collimator || Counts
 +
|-
 +
! 0,+/- 10cm || 25. deg ||  -2.6|| 30. deg ||  -2.0 || Centered Sieve || Total of 4.0M SHMS triggers.
 +
|-
 +
! +/- 5cm || 22. deg ||  -3.2|| 22. deg ||  -3.2 || Centered Sieve || Total of 1.0M SHMS Triggers.
 +
|}
 +
== Additional Coincidence Checkout [3 hr] ==
 +
 +
* Conditions:
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current:  || 65 μA
 +
|-
 +
! fast raster: || 2x2 mm2
 +
|-
 +
! target: || 10cm LH2
 +
|-
 +
! HMS/SHMS collimator: || PION , COLLIMATOR
 +
|-
 +
! HMS/SHMS trigger: || Coincidence
 +
|-
 +
! HMS angle/momentum  || Various
 +
|-
 +
! SHMS angle/momentum  || Various
 +
|}
 +
*Run Plan:
 +
**HMS is detecting electrons and SHMS is detecting protons.
 +
** Use HMS pion collimator and SHMS collimator.
 +
** Cycle SHMS for each change when raising momentum
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! Target || Prescales || HMS angle || HMS momentum  || SHMS angle  || SHMS momentum  || Time
 +
|-
 +
! LH2  || ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 || 22.0  deg ||  -4.284      ||  33.3 deg  ||  +2.925 || 30 min (65Hz)
 +
|-
 +
! 0.5% carbon || ps1=0,ps2=-1,ps3=-1,ps4=0,ps5=-1,ps6=-1  || 22.0  deg ||  -4.284      ||  33.3 deg  ||  +2.925 || 10min
 +
|-
 +
! 0.5% carbon ||  ps1=0,ps2=-1,ps3=-1,ps4=0,ps5=-1,ps6=-1||35.0  deg ||  -2.869      ||  22.0 deg  ||  +4.38 || 10 min
 +
|-
 +
! LH2  || ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 ||35.0  deg ||  -2.869      ||  22.0 deg  ||  +4.38 || 30 min (6Hz)
 +
|-
 +
! LH2  || ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 ||50.0  deg ||  -1.864      ||  15.3 deg  ||  +5.41 || 1.5 hrs (0.6Hz)
 +
|-
 +
! 0.5% carbon ||  ps1=0,ps2=-1,ps3=-1,ps4=0,ps5=-1,ps6=-1||50.0  deg ||  -1.864      ||  15.3 deg  ||  +5.41 || 10 min
 +
|}
 +
* Run until 8am when Jay Benesch in MCC will do the beam energy measurement.
  
−
  beam current : 10 μA
+
== Beam Energy Measurement (3 hours)==
−
  beam raster : 1 x 1 mm²
+
* Experts: MCC, Jay Benesch
−
 
+
* Expected time: 3 hours
−
  target : central carbon
+
* Goal: Measure beam energy for elastics
−
 
+
* Conditions:
−
  Change raster and current as described below.
+
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current: || 5uA
 +
|-
 +
! fast raster: || off
 +
|-
 +
! target: || none
 +
|}
 +
*MCC procedure
 +
== Target LH2/LD2 boiling study==
 +
* Experts: Eric Pooser
 +
* Expected time:
 +
* Goal: Measure target boiling.
 +
* Conditions: 
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current (uA):  || 2, 7, 10, 20, 30, 40, 50, 60, 65
 +
|-
 +
! fast raster: || 2x2mm
 +
|-
 +
! target: || 10cm LH2, 10cm LD2, 0.5% Carbon, *Al 10 cm Dummy only at 20 and 40 muA*
 +
|-
 +
! SHMS/HMS collimator: || Collimator/PION
 +
|-
 +
! SHMS trigger: || SCIN 3/4
 +
|-
 +
! SHMS angle/momentum:  || 15 deg / -3 GeV/c
 +
|-
 +
! HMS trigger: || SCIN 3/4
 +
|-
 +
! HMS angle/momentum:  || 15 deg / -3 GeV/c
 +
|-
 +
|}
 +
* Run Plan:
 +
** Set spectrometers to above settings
 +
** For each target, do nine separate runs for each current and take 200,000 events.
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! Target || Trigger || Currents
 +
|-
 +
!10cm LH2 || ps1=#, rest to -1, Set # so deadtime is 20% || 2, 7, 10, 20, 30, 40, 50, 60, 65
 +
|-
 +
!10cm LD2 || ps1=#, rest to -1, Set # so  deadtime is 20%  || 2, 7, 10, 20, 30, 40, 50, 60, 65
 +
|-
 +
!0.5% carbon || ps1=#, rest to -1, Set # so  deadtime is 20%  || 2, 7, 10, 20, 30, 40, 50, 60, 65
 +
|-
 +
!10 cm dummy || ps1=#, rest to -1, Set # so  deadtime is 20%  || 20,40
 +
|}
  
−
At a stable beam condition, using the fast raster with a size of 1 by 1 mm2 and the central carbon target, monitor the values of the three BPM's of the last beam line girder (IPM3H07A-C, or “A, B and C”) and take a short run (~10K). Verify that we have all three BPM's (in Epics readout) of the last beam line girder in the data stream and that the values are consistent with those from the MEDM/TCL screen. Next, use unrastered beam (fast raster off) and the central Carbon target of the optics targets, and 10 μA current. Record superharp scans (they will give us the absolute scales) and check those versus the beam positions given by the BPM's both from the MEDM/TCL screen and from Epics readout. Ask MCC to move the beam horizontally by ±1 and ±2 mm with a far upstream magnet, and record at each setting both superharps and the three BPM's, both from MEDM/TCL and from the data stream after short runs. Have the beam moved back to the nominal central position (horizontally) and ask MCC to move the beam vertically by ±1 and ±2 mm, recording at each setting again the two superharps and all three BPM's. Change the current to 20 μA and repeat the whole sequence. Change the current to 60 μA and repeat. Go back to 10 μA current and take a short run (~10K) with a fast raster with varying size, say 2 by 2, 3 by 3, and 4 by 4 mm2, recording superharp scans after each run (this to calibrate the fast raster size).
+
== Final  Checkout of SHMS ELREAL/ELCLEAN Trigger ( 3 hour)==
 +
* Experts: Simona Malace
 +
* Expected time: 3 hr
 +
* Goal:
 +
** Take data to determine thresholds.
 +
**Sanity check of electron triggers.
 +
* Conditions:
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current:  || 65 μA
 +
|-
 +
! fast raster: || 2x2mm
 +
|-
 +
! target: || 10cm LH2
 +
|-
 +
! SHMS collimator: || Collimator
 +
|-
 +
! SHMS trigger: || Various triggers
 +
|-
 +
! SHMS angle/momentum  || 25. deg, -3.0 GeV/c, -1.4
 +
  |}
  
−
== Tuning Optics ==
+
* Run Plan
  
−
=== Reestablish Standard HMS Tune ===
+
** Take run with 3/4 and threshold at 10mV
 +
** Take run with 3/4 and thresholds at: SHMS (PRLO = 10 mV, PRHI = 15 mV, CER = 10 mV)
 +
** Take run with ELREAL only trigger
 +
** Take run with ELCLEAN trigger
 +
** Analyze results and confirm that expected efficiencies are achieved.
 +
** Lower spectrometer momentum to -1.4 GeV to increase pi/e ratio.
 +
** Repeat all of above
  
−
  beam current : < 10 μA
+
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
−
  beam raster : 1 x 1 mm², or 0.5 mm radius, or off
+
|-
−
 
+
! SHMS angle/mom || Target  || SHMS Trigger || Trigger Thresholds || Total DAQ Triggers
−
  target : central carbon
+
|-
−
 
+
!  25./-3.0 || 10cm LH2  || Only 3/4 trigger || All PID legs to 10mV || 300K
−
  HMS collimator : sieve slit
+
|-
 +
!  25./-3.0 || 10cm LH2  || Only 3/4 trigger || SHMS PID legs to: PRLO = 10mV, PRHI = 15 mV, CER =10 mV || 300K
 +
|-
 +
!  25./-3.0 || 10cm LH2  || Only ELREAL  || SHMS PID legs to: PRLO = 10mV, PRHI = 15 mV, CER =10 mV  || 300K
 +
|-
 +
!  25./-3.0 || 10cm LH2  || Only ELCLEAN || SHMS PID legs to: PRLO = 10mV, PRHI = 15 mV, CER =10 mV  || 300K
 +
|-
 +
!  25./-1.4 || 10cm LH2  || Only 3/4 trigger || All PID legs to 10mV || 300K
 +
|-
 +
!  25./-1.4 || 10cm LH2  || Only 3/4 trigger || SHMS PID legs to: PRLO = 10mV, PRHI = 15 mV, CER =10 mV || 300K
 +
|-
 +
!  25./-1.4 || 10cm LH2  || Only ELREAL  || SHMS PID legs to: PRLO = 10mV, PRHI = 15 mV, CER =10 mV || 300K
 +
|-
 +
!  25./-1.4 || 10cm LH2  || Only ELCLEAN || SHMS PID legs to: PRLO = 10mV, PRHI = 15 mV, CER =10 mV || 300K
 +
|-
 +
|}
  
−
Use the HMS sieve slits in combination with the Carbon optics target (i.e. the central Carbon target on the optics target assembly hanging off the cryo target system). Use a current of less than 10 μA, and a fast raster size of 1 by 1 mm2, or with 0.5 mm radius. The exact raster shape does not matter: the raster can even be off in this configuration. Measure a short Carbon spectrum, about 250K events. Produce an ntuple, and do the following: select electrons with shower counter and/or Cherenkov cuts, and make a spectrum of x vs y at the nominal focal plane. What you should see is a ``spider" with 5 legs. The non-straightness of the central leg indicates there is an offset in the Z or Y direction. If you don't see a ``spider" or something resembling it one of the polarities of the HMS magnets is set wrong (or the magnet is off). If you see a ``spider" next thing to figure out is what the X, Y, and Z offsets are of your present ''beam-target interaction point'', but at least your tune is fine for detailed electronics/detector checkout.
+
== SHMS Elastic Single arm Checkout Additional angles (4 hours) ==
 +
* Experts:
 +
* Expected time:
 +
* Goal:
 +
* Conditions:
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current:  || 65uA
 +
|-
 +
! fast raster: || 2x2mm2
 +
|-
 +
! target: || 0.5% carbon, 10cm LH2
 +
|-
 +
! SHMS collimator: || PION , COLLIMATOR
 +
|-
 +
! SHMS trigger: || SCIN 3/4, SCIN 3/4
 +
|-
 +
! SHMS angle/momentum  || 16,20 ,30,35 deg / 5.074,4.522,3.349,2.869 GeV
 +
|}
 +
*Run plan
 +
** Take 15 min run with 0.5% carbon. Run LH2  for 10,000 events in elastic W for SHMS at 16 deg.
 +
** Take 15 min run with 0.5% carbon. Run for 10,000 events in elastic W for SHMS at 20 deg
 +
** Take 15 min run with 0.5% carbon. Run for 10,000 events in elastic W for SHMS at 30 deg
 +
** Take 15 min run with 0.5% carbon. Run for 10,000 events in elastic W for SHMS at 35 deg
  
−
=== Verification of Beam-Target Interaction Point ===
+
== CT Physics [53 hrs] ==
 +
 +
* Conditions:
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current:  || 65 μA
 +
|-
 +
! fast raster: || 2x2 mm2
 +
|-
 +
! target: || 10cm LH2
 +
|-
 +
! HMS/SHMS collimator: || PION , COLLIMATOR
 +
|-
 +
! HMS/SHMS trigger: || Coincidence
 +
|-
 +
! HMS angle/momentum  || Various
 +
|-
 +
! SHMS angle/momentum  || Various
 +
|}
 +
*Run Plan:
 +
**HMS is detecting electrons and SHMS is detecting protons.
 +
** Use HMS pion collimator and SHMS collimator.
 +
** Keep track of good coincidence physics events (with tight PID cuts and coincidence time cut) such that we have 10000 events each for LH2 and Carbon
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! Target || Prescales || HMS angle || HMS momentum  || SHMS angle  || SHMS momentum  || Time
 +
|-
 +
! LH2  || ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 || 45.1  deg ||  -2.131      ||  17.1 deg  ||  +5.122 || 12 hrs
 +
|-
 +
! LH2  || ps1=0,ps2=-1,ps3=-1,ps4=0,ps5=-1,ps6=-1 || 45.1  deg ||  -2.131      ||  17.1 deg  ||  +5.122 || 30 min
 +
|-
 +
! Al. Dummy || ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0  || 45.1  deg ||  -2.131      ||  17.1 deg  ||  +5.122 || 4 hrs
 +
|-
 +
! 6% C || ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0  || 45.1  deg ||  -2.131      ||  17.1 deg  ||  +5.122 || 36 hrs
 +
|-
 +
! 6% C || ps1=0,ps2=-1,ps3=-1,ps4=0,ps5=-1,ps6=-1  || 45.1  deg ||  -2.131      ||  17.1 deg  ||  +5.122 || 30 min
 +
|}
 +
* If possible after completing the LH2 and Dummy we can move to F2 Physics program and come back to the Carbon after the F2 physics program
  
−
  beam current : < 10 μA
+
== F2 Physics ==
−
  beam raster : 1 x 1 mm², or 0.5 mm radius, or off
+
*[https://hallcweb.jlab.org/wiki/index.php/Main_Page#F2_Experiment_.28E12-10-002.29_L.2FT_measurement_Run_Plan Run plan]
−
 
 
−
  target : central carbon
 
−
 
 
−
  HMS collimator : sieve
 
  
−
Use the previous run, or if you are in the iteration process run at less than 10 μA current, use the Carbon optics target. Use a fast raster size of 1 by 1 mm2, or with 0.5 mm radius. The exact raster shape does not matter: the raster can even be off in this configuration. Take a short run (100K). Analyze and make an ntuple. Make the following plots: x vs y at the focal plane, xp vs yp at the target (you may have to use some Particle Id. and reconstruction cuts here!), and y at the target. You want to check the following: is the central leg of the ``spider" in x vs y at the focal plane straight? is the reconstructed y position close to y = 0? Is the central sieve slit hole close to (yp,xp) = (0,0)? If the xp position of the central sieve hole is close to 0, you probably are a bit off in vertical beam position after all, fix this. If you are far off (larger than 2 mr), check all your results carefully, did something go wrong in the vertical beam assignment? If the central leg of the ``spider" is close to vertical, you are close to having mid-plane symmetry for the spectrometer. You can vary the horizontal beam position a bit to check this. Note that the present quad alignment is such that the quad system is about 1 mm to the right of the line through the nominal pivot and the spectrometer angle, so the y position at the target can be a little bit negative, and the central leg of the spider can be slightly tilted. If the yp position of the central sieve hole is within 1 or 2 mr of the nominal zero position you are probably fine. The big uncertainty will be whether the targets are actually located at the nominal pivot (z = 0) position. If the target survey says otherwise, you expect (i) the central leg of the ``spider" not to be straight, (ii) the y reconstruction not to be perfect, and (iii) an offset in yp for the central sieve hole. If the three pieces of information are pretty much consistent with the survey assume you are done (note: the HMS sieve is at a distance of 1.66 meter of the target). You can consider checking this by using a hole target, or by rotating the spectrometer to a larger angle, and verifying that indeed things are consistent.
+
== Remaining Commissioning ==
 +
=== SHMS Elastic Single arm Checkout Additional angles (4 hours) ===
 +
* Experts:
 +
* Expected time:
 +
* Goal:
 +
* Conditions:
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current:  || 65uA
 +
|-
 +
! fast raster: || 2x2mm2
 +
|-
 +
! target: || 10cm LH2
 +
|-
 +
! SHMS collimator: || COLLIMATOR/Center sieve
 +
|-
 +
! SHMS trigger: || SCIN 3/4
 +
|-
 +
! SHMS angle/momentum  || 25 ,30  / -3.911,-3.349
 +
|}
 +
*Run plan
 +
**Take data at SHMS angle = 25 and momentum = -3.911 with collimator for 30 minutes.
 +
**Take data at SHMS angle = 25 and momentum = -3.911 with centered Sieve for 1 hour.
 +
**Take data at SHMS angle = 25 and momentum = -3.6 with collimator for 30 minutes.
 +
**Take data at SHMS angle = 25 and momentum = -3.349 with collimator for 30 minutes.
 +
**Take data at SHMS angle = 30 and momentum = -3.349 with collimator for 1 hour.
 +
**Take data at SHMS angle = 30 and momentum = -3.349 with centered sieve for 2 hour.
  
−
=== Consistency Check of Beam-Target Interaction Point – Verification of Target-Ladder ===
+
  
−
  target : hole
 
  
−
If done with the beam line checkout to establish a nominal centered beam on target, and having verified the beam-target interaction point using the well-understood and aligned HMS, one can consider a short run installing a hole target to ensure consistency. This checks that the target ladder position is well known, and that nothing went wrong in either establishing nominal positions for the last BPMs before target or the beam-target interaction centering with HMS.
 
  
−
=== Verify Quadrupole Settings SHMS ===
+
===22 deg Ytar: SHMS Angle and Position Matrix Optimization (1 hours)===
 +
* Experts:
 +
* Expected time: 1 hours.
 +
* Goal: Need more optics data for SHMS at large angles.
 +
* Conditions:
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current:  || 65 μA
 +
|-
 +
! fast raster: || 2x2
 +
|-
 +
! target: ||  0,+/- 10cm
 +
|-
 +
! SHMS collimator: || Centered Sieve,Shifted Sieve
 +
|-
 +
! SHMS trigger: || ELREAL
 +
  |-
 +
! SHMS angle/momentum  || 22 deg, -3.2 GeV/c
 +
|}
 +
*Run Plan: Take during switch in HMS polarity.  Time is assuming 65uA. 
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
! Target  || SHMS angle || SHMS momentum  || SHMS collimator || Time
 +
|-
 +
! 0,+/- 10cm || 22. deg ||  -3.2 || Centered Sieve || 30 minutes
 +
|-
 +
! 0,+/- 10cm || 22. deg ||  -3.2 || Shifted Sieve || 30 minutes
 +
|}
  
−
  beam current : < 10 μA ?
+
=== SHMS Low momentum electrons and large angle (3 hours)===
−
  beam raster : 1 x 1 mm², or 0.5 mm radius, or off ?
+
* Experts: Eric Christy
−
 
+
* Expected time: 3 hours.
−
  target : central carbon
+
* Goal: 
−
 
+
* Conditions:
−
   SHMS collimator : large
+
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current: || 65 μA, 40uA (Aluminum dummy)
 +
|-
 +
! fast raster: || 2x2
 +
|-
 +
! target: || 10cm Lh2, 10cm Al dummy
 +
|-
 +
! SHMS collimator: || collimator
 +
|-
 +
! SHMS trigger: || ELREAL
 +
  |-
 +
! SHMS angle/momentum  || 35 deg, -2.6 GeV/c
 +
|}
 +
*Run Plan: Take while HMS with positive polarity is taken.  Time is assuming 65uA. 
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
! Target   || SHMS angle || SHMS momentum  || Time
 +
|-
 +
!10cm Lh2 || 35. deg ||  -2.6  || 2 hours
 +
|-
 +
! 10cm || 35. deg ||  -2.6  || 20 minutes
 +
|}
  
−
Now that we know the beam-interaction point, we start looking at the SHMS. Use the Carbon optics target and beam raster pattern as before, and the collimator (no sieve slit needed yet). For SHMS, the point-to-point optics at the focal plane will look skewed as the horizontal bend magnet will ruin the regular symmetry of the spectrometer optics, so x and y will be coupled. Thus, for the SHMS you may have to compare simulated focal plane patterns with measurements to be able to judge if quadrupole fields differ from expected although you can do much with just looking at the focal plane pattern. First verify that we have obtained a point-to-point focus with the extrapolated quadrupole settings, by looking at plots of hsxfp vs. hsyfp. The SHMS should have a “tilted” hour glass pattern for a point target source, with the waist of the hourglass at (0,0). If not, vary the quadrupole settings in small steps (try 0.2, 0.5 or 1% steps. Q2 is most sensitive and 0.2% steps should be sufficient for Q2 – the gradient of motion of the hourglass waist is roughly 2 cm per % Q2 change. For Q1 it is about -0.4 cm per % Q1 change), until the golden tune (this is defined as the SHMS quadrupole settings that most closely reproduces the simulated sieve slit patterns at the focal plane) is obtained. Measure a spectrum with high statistics (>>100K) to use for later off-line checks and to continue the second phase of detector checkout – this is needed before starting the sieve slit runs. Check the time-to-distance maps, align the wire chamber positions in software and enable linked stub fitting, check the detector positions, check the timing and calibration constants (shower counter gains, pedestals, timing offsets, pulse height corrections, attenuation lengths, efficiencies, position dependencies). Optimize tracking properties. Make sure that <math>\Theta</math> and <math>\Phi</math> spectra are wide as expected. Construct <math>x</math>, <math>y</math>, <math>\Theta</math>, and <math>\Phi</math> spectra at the nominal focal plane. Does everything look reasonable? Check tracking with one wire chamber set against tracking with two wire chamber sets. Reconstruct target quantities.
+
===30 deg  Ytar: HMS/SHMS Angle and Position Matrix Optimization (3 hours)===
 +
* Experts:
 +
* Expected time: 3 hours.
 +
* Goal: Need more optics data for SHMS at large angles.
 +
* Conditions:
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current:  || 65 μA
 +
|-
 +
! fast raster: || 2x2
 +
|-
 +
! target: || optics targets
 +
|-
 +
! SHMS collimator: || Centered Sieve
 +
|-
 +
! SHMS trigger: || ELREAL
 +
|-
 +
! SHMS angle/momentum  || 30. deg, -2.0 GeV/c
 +
|}
 +
*Run Plan:  Time is assuming 65uA. Take one hour long runs.  
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
! Target  ||  SHMS angle || SHMS momentum  || SHMS collimator || Time
 +
|-
 +
! 0,+/- 10cm ||  30. deg ||  -2.0 || Centered Sieve || 3 hours
 +
|}
  
−
=== Establish Standard SHMS Tune ===
+
=== Repeat Target LH2 boiling study with new SHMS sheilding===
 +
* Experts:
 +
* Expected time:
 +
* Goal: With new SHMS shielding reconfiguration, repeat LH2 measurement and see if background reduced.
 +
* Conditions: 
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current (uA):  || 10, 30 , 65
 +
|-
 +
! fast raster: || 2x2mm
 +
|-
 +
! target: || 10cm LH2
 +
|-
 +
! SHMS/HMS collimator: || Collimator/PION
 +
|-
 +
! SHMS trigger: || SCIN 3/4
 +
|-
 +
! SHMS angle/momentum:  || 15 deg / -3 GeV/c
 +
 +
|}
 +
* Run Plan:
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! Target || Trigger || Currents
 +
|-
 +
!10cm LH2 || ps1=#, rest to -1, Set # so deadtime is 20% || 10, 30,  65
 +
|}
  
−
  beam current : < 20 μA
+
== Lower priority ==
−
  beam raster : off, or 1 x 1 mm²
+
= Beam energy of 10.6 GeV =
−
 
 
−
  target : central carbon
 
−
 
 
−
  SHMS collimator : sieve slit
 
  
−
Use the SHMS sieve slit with the middle vertical column centered in combination with the Carbon optics target. Use a current of less than 20 μA. Preferentially, the fast raster should be off for this series of measurements. However, a small fast raster size of 1 by 1 mm2 should also work. Measure a short Carbon spectrum of perhaps 100K events. Produce an ntuple, and do the following: make a spectrum of x vs y at the nominal focal plane. What you should see is a tilted ``spider" with 9 legs. The center of the spider/hourglass should be at (x,y) = 0 if everything went right. If not, check the beam interaction point and check the quadrupole magnet settings. Because the HB magnet destroys the mid-plane symmetry of the SHMS, you likely will need to compare simulated focal plane patterns with measurements to be able to judge if quadrupole fields are o.k. If you do see a difference you can try to change the quadrupole settings by say 0.1% and measure a new run and produce and ntuple to compare. If the patterns look similar we are done with establishing the Standard SHMS tune beyond the dispersion. <span style="color:red">We will first do more detailed detector checkout at 3- or 4-pass beam energy towards the Key Performance Parameters. Then, we first likely should go to one-pass beam energy to check the dispersion and then return to >6 GeV beam energy for further optics and systematic understanding checkout.</span>
+
== Beam Energy Measurement ==
 +
* Experts: MCC,Mark Jones, Dave Mack
 +
* Expected time: ? hours
 +
* Goal: Measure beam energy for carbon elastics.
 +
* Conditions:  
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current:  || 5uA
 +
|-
 +
! fast raster: || off
 +
|-
 +
! target: || none
 +
|}
 +
*MCC procedure
  
−
== Detailed Detector Checkout ==
 
  
−
<span style="color:red">Note: still need to do editing in this detailed detector checkout section but the first-order fixes were made.</span>
+
== HMS/SHMS Tune Verification ==
 +
* Experts:
 +
* Expected time:
 +
* Goal:
 +
**Mix of ep elastic data,  and carbon data to check SHMS tune.
 +
**Also LH2 inelastic to calibrate the calorimeter.
 +
* Conditions:
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! beam current:  || max current μA
 +
|-
 +
! fast raster: || 2x2
 +
|-
 +
! target: || 1.5% carbon, 10 LH2
 +
|-
 +
! HMS/SHMS collimator: || PION/SIEVE , COLLIMATOR/Centered Sieve
 +
|-
 +
! HMS/SHMS trigger: || SCIN 3/4, SCIN 3/4
 +
|-
 +
! HMS angle/momentum  ||  see table
 +
|-
 +
! SHMS angle/momentum  || see table
 +
|}
 +
*Run Plan
 +
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
 +
|-
 +
! Target  || HMS angle || HMS momentum|| HMS collimator  || SHMS angle  || SHMS momentum  || SHMS collimator  || Time
 +
|-
 +
! LH2  || 18.5  deg ||  -6.693      || pion ||  8.5 deg  ||  -9.430 || Collimator || 30 min
 +
|-
 +
! LH2 ||  18.5 deg ||  -6.693  || Pion  ||  8.5 deg  ||  -7.3 || Collimator || 30 min
 +
|-
 +
! 1.5% carbon ||  18.5 deg ||  -5.816  || Sieve  ||  8.5 deg  ||  -7.3 || Centered Sieve || 1 hr
 +
|-
 +
! LH2  || 18.5  deg ||  -5.816    || Pion ||  16.5 deg  || -7.234  || Collimator || 1 hr
 +
|-
 +
! LH2  || 18.5  deg ||  -5.816    || Pion ||  16.5 deg  || -5.5  || Collimator || 1 hr
 +
|-
 +
! 1.5% carbon || 18.5  deg ||  -5.816    || Sieve  ||  16.5 deg  ||  -5.5 || Centered Sieve || 2 hr
 +
|}
  
−
=== Wire Chamber High-Voltage Plateaus ===
+
== BCM Calibration ( 1 hour) ==
 +
*
  
−
  target : central carbon
+
== Use GEM to check out SHMS optics ==
−
 
+
* Experts: Latif
−
  HMS angle : 15°
+
* Expected time:
−
  HMS momentum : -3 Gev/c
+
* Goal:
−
  HMS collimator : large
+
* Conditions:  
−
 
+
{|class="wikitable" style="margin-left: 60px; margin-right: auto; border: none;"
−
  SHMS angle : 15°
+
|-
−
  SHMS momentum : -3 Gev/c
+
! beam current: || <1 μA
−
  SHMS collimator : large
+
|-
−
 
+
! fast raster: || off
−
If not already there, rotate the spectrometers to 15° and set the spectrometer momenta at 3.0 GeV/c (negative polarity, assuming >6 GeV beam energy) to increase the count rates. Plot the counts per wire chamber plane vs. the high voltage, determine the wire chamber high-voltage plateaus for electrons for both SHMS and HMS (as there are new wire chambers there – note that these do not require the checkout versus threshold of the previous HMS wire chambers). Choose correct operating voltages for detecting electrons.
+
|-
−
 
+
! target: || optics targets
−
=== Shower Counter Calibration Run ===
+
  |-
−
 
+
! SHMS collimator: || Collimator
−
By the time this starts all changes in the electronics and trigger have been made and the ADC gates for the calorimeter signals have been adjusted. With HMS and SHMS still at angles of 15° and momenta of -3.0 GeV/c, take a run with >100K statistics each. Adjust the delay time for the ADC gates with +/-20 ns and measure again. If the gate timing is optimal, the ``maximum" ADC values should change less than 5%. Adjust the gate timing if not optimal and repeat. If the gate timing is optimal, start gain matching by adjusting the HV's. For optimal HV settings the ADC peaks must be in the range between 80 and 100. Adjust the HV of those PMT's which are out of this range (a ±50 V change results in a change of ~15-20% in amplitude). After this procedure '''NEVER''' change the HV settings for the calorimeter PMT's anymore. Now take large statistics runs (>250K each). If time permits, one can consider reversing the polarities of both spectrometers and take again large statistics runs (>250K each). Do not use the Particle Id. trigger in any of these runs!
+
|-
−
 
+
! SHMS trigger: || 3/4 Scin + Cer
−
=== Calibration Spectra: Carbon ===
+
|-
−
 
+
! SHMS angle/momentum || 25. deg, -2.0 GeV/c
−
Take a large run (250K) for both HMS and SHMS to check wire chamber time-to-distance maps, align the wire chamber positions in software and enable linked stub fitting, check the detector positions, check the timing and calibration constants (shower counter gains, pedestals, timing offsets, pulse height corrections, attenuation lengths, efficiencies, position dependencies). Optimize tracking properties. Make sure that <math>\Theta</math> and <math>\Phi</math> spectra are wide as expected. Construct <math>x</math>, <math>y</math>, <math>\Theta</math> and <math>\Phi</math> spectra at the nominal focal plane. Does everything look reasonable? Check tracking with one wire chamber against tracking with two wire chamber sets. Reconstruct target quantities. This run can be used for the initial timing/calorimeter/cherenkov calibrations.
+
|}
−
 
+
*Run Plan:
−
=== Scintillator Calibration Run ===
 
−
 
 
−
The previous run can also be used for timing tests for a “low count rate” situation:
 
−
* Make sure that all ADC's, TDC's '''including''' the RF TDC are present. Check the timing properties at focal plane (beta resolutions) for this ``low count rate" situation.
 
−
* Determine the scintillator plane efficiency as a function of discriminator threshold setting in the electronics.
 
−
 
 
−
Then, try to mimic a “high count rate” situation:
 
−
* Hodoscope Timing Tests HMS and SHMS --- High Rate. Measure the above run with much higher statistics, say about a factor of five. This you can accomplish by for example using the triple optics target and an increased beam current. Make sure all ADC's, TDC's '''including''' the RF TDC are present. Measure at least 250K events for each spectrometer. Check the timing properties at focal plane (beta resolutions).
 
−
 
 
−
=== Defocused Run HMS and SHMS ===
 
−
 
 
−
  target : BeO
 
−
 
 
−
 
 
−
Here, we want to illuminate the whole detector plane. Adjust the current settings of the HMS Q2 and SHMS Q2 (20% different from default should do the trick). Use the BeO target, and central momentum settings of -3.0 GeV/c (assuming both spectrometers are still at 15o). Make sure that all ADC's, TDC's '''including''' the RF TDC are present. Measure a spectrum with high statistics (250K) to use for later off-line checks. Check the time-to-distance maps, align the wire chamber positions in software and enable linked stub fitting, check the detector positions, check the timing and calibration constants (shower counter gains, pedestals, timing offsets, pulse height corrections, attenuation lengths, efficiencies, position dependencies).
 
−
 
 
−
<span style="color:red">End of detailed detector checkout that still needs updating. Detailed detector checkout should at the least have brought us to the Key Performance Parameters, to be shown at this >6 GeV energy.</span> It is assumed we now move to the further SHMS optics tuning at lower (one-pass) beam energy, where we then after this stage return to >6 GeV beam energy and take detailed measurements to determine the optics matrix elements for extended targets and do the further detector checkout related to Particle Identification. '''The noble-gas Cherenkov should be replaced with the alternate SHMS vacuum extension.'''
 
−
 
 
−
= SHMS Tuning - Beam Energy ~ 2 GeV =
 
−
 
 
−
At this stage the operability of the noble-gas Cherenkov to fulfill the required Key Performance Parameters should have been shown, and the detector should have been removed and replaced with the alternate SHMS vacuum extension.
 
−
 
 
−
== Quad Tuning ==
 
−
 
 
−
=== Inelastic Region ===
 
−
 
 
−
Here we will first check if the chosen quadrupole settings at >6 GeV beam energy will keep the focus of the spectrometer (as determined by the waist of the spider/hourglass) fixed for a different momentum/quadrupole field values. Set the spectrometer angle to 15 degrees (or if it was already at seven degrees in preparation of the elastic scan below this is fine) and set the momentum to -1.2 GeV/c. Make sure that the beam remains centered, simply looking at the IPM3H07A-C beam position monitors may suffice already, otherwise use the superharp/BPMs or view at a BeO target, or use HMS. Use the thin C target as before, and the sieve slit, and up to <math>20 \mu A</math> with an unrastered or small rastered (1 by 1 mm2) beam. Measure a short Carbon spectrum of perhaps 100K events. Produce an ntuple, and do the following: make a spectrum of x vs y at the nominal focal plane. What you should see is a tilted ``spider" with 9 legs. The center of the spider/hourglass should still be at (x,y) = 0 if everything went right. If required you can estimate a needed change in Q1 or Q2 from the gradients as given before (2 cm shift for a 1% Q2 change and -0.4 cm shift per % Q1 change). Minimize the variation in the fields until we believe the quadrupole settings are determined to as close to 0.1% as you can get.
 
−
 
 
−
=== C Elastic ===
 
−
 
 
−
Change to an elastic central momentum setting of the SHMS, this should be at around seven degrees for a 2.2 GeV beam energy. At this angle the ratio of ground state to 2+ at 4.4 MeV for carbon-elastic scattering should be about 0.5:1. If SHMS can only be used at larger angles this drastically affects this ratio, like at nine degrees it is more like 0.02:1. Use the thin C target. Verify occasionally that the beam is centered, either with the superharps/BPMS or as viewed on the BeO target. Check that the ground state for carbon ratio of ground state to 2+ is indeed about 0.5:1 close to xfp = 0. Note that if we did everything right the focal plane should be at z = 0 cm. Project to this position and check the two-dimensional plots of xpfp vs xfp, and delta vs xfp to start looking at the energy resolution for the elastic peak (use the SHMS ntuple). Now we start tuning the quadrupole fields to optimize the energy resolution for the elastic peak. <span style="color:red">It should help that we have comparable strengths of the ground state and first excited 2+ state of Carbon. You may also compare with the simulated focal plane spectra for a delta function in momentum, for variations of Q1 and Q2.</span> Minimize the variation in the quadrupole fields until their settings are roughly determined to better than 0.1% (this likely will not be possible for Q3 which has less effect). If we did the earlier checks of establishing the standard tune at >6 GeV beam energy by optimizing the spider/hourglass right we should already be within a few 0.1% of the right values, but we may need to resolve ambiguities between Q1 and Q2 here. After this, we have established the early SHMS magnet settings and hope it does not change with momentum – if so we are in business!
 
−
 
 
−
== Dispersion Calibration: C ==
 
−
 
 
−
Install the sieve slit. Shift the elastic peak of Carbon across the focal plane by making 4% changes in the momentum setting (from +25 to -15% going down). Determine the dispersion matrix elements. Verify occasionally that the beam is centered.
 
−
 
 
−
== Get X and Y Magnifications: Beam Sweep ==
 
−
 
 
−
Use the central momentum setting, the sieve slit, and the thin Carbon target. Simulate a rastered beam by moving the beam up and down, left and right by a few mm (as much as we can have, but probably 2-3 mm suffices). Determine the influence on aberrative matrix elements.
 
−
 
 
−
== Sieve Slit Measurements with C Optics “Extended” Target ==
 
−
 
 
−
<span style="color:red">The main goal of this step is just to have a set of sieve slit measurements in the can for the low momentum, as the bulk of the optics matrix element data will come later, this is only for checking if we see any momentum-dependence of the optics. If everything is correct we should not for the SHMS.</span>
 
−
 
 
−
Lower the central momentum setting of SHMS to -1.2 GeV/c again. Put the sieve slit in. First verify that the beam is centered on the BeO target. Now we need to mimic an extended target. Presumably, this means measuring two separate runs, for
 
−
* The triple optics target, with carbon foils at -10, 0 and +10 cm
 
−
* The double optics target, with carbon foils at -5 and +5 cm
 
−
Take runs with at least 100 counts for each visible hole. Determine the angular matrix elements. As described, we simulate a 10 cm target length (as viewed by SHMS at a 30 degree scattering angle). Scan over +/- 1 cm (or whatever we used in an earlier step) to verify the effect of beam rastering on the angular matrix elements.
 
−
 
 
−
= Further SHMS Tuning and Particle Identification Checkout - Beam Energy > 6 GeV =
 
−
 
 
−
<span style="color:red">Note: here we assumed a 6.4 GeV beam energy, different energies are fine but we then need to recalculate the kinematics that are picked with heepcheck.</span>
 
−
 
 
−
== Coincidence Electronics and Particle Identification Checkout ==
 
−
 
 
−
=== Superharp Scan [1 hr] ===
 
−
 
 
−
Make sure there is no target in the beam line, or the central carbon target that can also handle unrastered beam. Take a superharp scan with fast raster off (2 μA current) with superharps IHA3H07A and IHA3H07B. Verify that the beam size is as expected – this was <math>\sigma_x \approx 80 \mu m</math>, <math>\sigma_y \approx 150 \mu m</math> under 6-GeV conditions, as long as it is roughly <math>200 \mu m</math> or better in both directions it should be good enough to proceed.
 
−
 
 
−
=== SHMS Optics Verification [1 hr] ===
 
−
 
 
−
Start with the SHMS at 15 degrees and at a central momentum of -3.0 GeV/c. Use the central (Carbon) target of the optics target, and the fast raster with a size of 1 by 1 mm2. Use the SHMS sieve slit with the middle vertical column centered in combination with the Carbon optics target. Use a current of less than 20 μA. Preferentially, the fast raster should be off for this series of measurements. However, a small fast raster size of 1 by 1 mm2 should also work. Measure a short Carbon spectrum of perhaps 250K events. Produce an ntuple, and do the following: make a spectrum of x vs y at the nominal focal plane. What you should see is a tilted ``spider" with 9 legs. The center of the spider/hourglass should be at (x,y) = 0 if everything went right. If not, check the beam interaction point and check the quadrupole magnet settings. Because the HB magnet destroys the mid-plane symmetry of the SHMS, you likely will need to compare simulated focal plane patterns with measurements to be able to judge if quadrupole fields are o.k. Hopefully, everything is o.k. and we have established that the SHMS tune is to first order momentum independent.
 
−
 
 
−
=== Set Discriminator Thresholds for (P.Id.) Trigger ===
 
−
 
 
−
Part of these runs can be intertwined with other checkout. We need to have many small runs where we change the discriminator thresholds for the various trigger signals. Note that we obviously have to come back to some of these thresholds at a later stage, as the shower counter related discriminator thresholds will be momentum dependent, so some of this may come back after the following checkout. You can also check the scintillator plane efficiency as a function of discriminator threshold setting in the electronics.
 
−
 
 
−
=== Timing [3 hr] ===
 
−
 
 
−
Rotate HMS and SHMS both to an angle of 27.5°. Change the HMS momentum to -3.609 GeV/c, change the polarity for SHMS and change the momentum to +3.609 GeV/c. This setup should give you 0.2 Hz for the 3% radiation length Carbon target and a 20 μA beam current. You may want to ask for more beam current (50 μA?) and a change in fast raster to 1 by 1 mm2. You can also use the 10 cm LH2 target, which should give you a little above 1 Hz (for 20 μA beam current). Use the large (pion or HMS-100 for HMS) collimators. Check that all coincidence electronics signals are well timed, i.e. check coincidence trigger signals and ADC/TDC timing.
 
−
 
 
−
=== 1H(e,e’p) Coincidences [0.5 hr] ===
 
−
 
 
−
If not done so yet, install the 10 cm LH2 target and ask for 50 μA and a fast raster of 1 by 1 mm2. The rate from the 1H(e,e’p) reaction should be about 4 Hz. If you have verified that we see coincidences, measure at least 5K events.
 
−
 
 
−
=== 1H or 12C(e, e’ π) [2 hr] ===
 
−
 
 
−
Maintain/set the SHMS polarity to detect positively charged particles. Set the angle of SHMS at 20° and the central momentum setting of SHMS to +2.7 GeV/c, and the angle and central momentum setting of HMS to 16.8° and -3.8 GeV/c <span style="color:red">(please check)</span>. Use either the 10 cm LH2 target or the thick Carbon target (3% radiation length). Make sure we write HMS singles, SHMS singles, AND Coincidences. Measure at least for 20 minutes in this situation. Do we see any evidence for (e, e’ π) coincidences? (we expect about 10K per hour).
 
−
 
 
−
=== 1H(e’K) and 1H(e, e’K) [3 hr] ===
 
−
 
 
−
Set the angle of the SHMS at 15°, and keep the central momentum setting of SHMS at +3.6 GeV/c to detect kaons, and the angle and central momentum setting of HMS to 25° and -2.6 GeV/c <span style="color:red">(please check, maybe better to pick lower-Q2 kinematics, but still not too far from where we are with SHMS and HMS settings, to optimize rates and lower kaon momentum)</span>. Use the 10 cm LH2 target and 50 μA beam current. For this run the SHMS aerogel detector should be installed. Make sure we write HMS singles, SHMS singles, AND Coincidences. Measure at least for one hour in this situation. Check whether we can see any evidence for Kaons from Timing w.r.t. RF and the aerogel detector. Do we see any evidence for (e, e’K) coincidences? (we expect about 500 per hour).
 
−
 
 
−
== Start of Experiment checkout ==
 
−
 
 
−
=== Superharp Scan ===
 
−
 
 
−
<span style="color:red">Similar as what is in the beginning for beam line checkout. If this requires modifications it should be done at several places in the document.</span>
 
−
 
 
−
Make sure there is no target in the beam line, or the central carbon target that can handle unrastered beam too. Take a superharp scan with fast raster off (2 μA current) with superharps IHA3H07A and IHA3H07B. Verify that the beam size is as expected – this was <math>\sigma_x \approx 80 \mu m</math>, <math>\sigma_y \approx 150 \mu m</math> under 6-GeV conditions, as long as it is roughly <math>200 \mu m</math> or better in both directions it should be good enough to proceed).
 
−
 
 
−
=== Last Beam Line Girder Commissioning ===
 
−
 
 
−
<span style="color:red">Similar as what is in the beginning for beam line checkout. Keep similar if editing this or the earlier mention.</span>
 
−
 
 
−
At a stable beam condition, using the fast raster with a size of 1 by 1 mm2 and the central carbon target, monitor the values of the three BPM's of the last beam line girder (IPM3H07A-C, or “A, B and C”) and take a short run (~10K). Verify that we have all three BPM's (in Epics readout) of the last beam line girder in the data stream and that the values are consistent with those from the MEDM/TCL screen. Next, use unrastered beam (fast raster off) and the central Carbon target of the optics targets, and 10 μA current. Record superharp scans (they will give us the absolute scales) and check those versus the beam positions given by the BPM's both from the MEDM/TCL screen and from Epics readout. Ask MCC to move the beam horizontally by ±1 and ±2 mm with a far upstream magnet, and record at each setting both superharps and the three BPM's, both from MEDM/TCL and from the data stream after short runs. Have the beam moved back to the nominal central position (horizontally) and ask MCC to move the beam vertically by ±1 and ±2 mm, recording at each setting again the two superharps and all three BPM's. Change the current to 20 μA and repeat the whole sequence. Change the current to 60 μA and repeat. Go back to 10 μA current and take a short run (~10K) with a fast raster with varying size, say 2 by 2, 3 by 3, and 4 by 4 mm2, recording superharp scans after each run (this to calibrate the fast raster size).
 
−
 
 
−
=== Sieve slit measurement with C Optics “Extended” Target – Part I [2 hrs] ===
 
−
 
 
−
<span style="color:red">Note that C optics “extended” target in reality means two configurations, the triple optics target, with carbon foils at -10, 0 and +10 cm, and the double optics target, with carbon foils at -5 and +5 cm.</span>
 
−
 
 
−
We have to calibrate the angular and vertex position reconstruction of the HMS and SHMS for the full y ranges of the experiments. Start with both HMS and SHMS at an angle of 25.00°, and both spectrometers at a central momentum of -3.0 GeV/c. Use initially the central Carbon target of the triple optics target assembly. Install the sieve slits. Use the electron Particle Id. trigger! Use a current of 50 μA, and use the fast raster with a size of 1 by 1 mm2. Verify the beam is centered on the 3H07C BPM. Take a high statistics run in SHMS (make sure there are at least 100 counts per sieve slit hole for each target, 25K electrons should be sufficient). Take a similar large statistics run with HMS. Repeat the measurements (both SHMS and HMS) using the C optics ``extended" target, take in this case at least 100K statistics.
 
−
 
 
−
=== Sieve slit measurement with C Optics “Extended” Target – Part II [6 hrs] ===
 
−
 
 
−
<span style="color:red">Check rates</span>
 
−
 
 
−
<span style="color:red">Note that C optics “extended” target in reality means two configurations, the triple optics target, with carbon foils at -10, 0 and +10 cm, and the double optics target, with carbon foils at -5 and +5 cm.</span>
 
−
 
 
−
Keep SHMS at 25.00° and rotate HMS to 50.00°. Change the central momentum of both spectrometers to -2.0 GeV/c. We will calibrate the angular and vertex position reconstruction of the HMS for the future L/T experiments now assuming a 10 cm target as viewed at a maximum angle of 60.00°.
 
−
 
 
−
Use initially the central Carbon target of the optics assembly. Install the sieve slits. Use the electron Particle Id. trigger! Use a current of 50 μA, and use the fast raster with a 0.5 mm radius. Verify the beam is centered on the 3H00A BPM. Take a high statistics run in SHMS (make sure there are at least 100 counts per sieve slit hole for each target, 25K electrons should be sufficient). Take a large statistics run with HMS with at least 10K electrons (check in the ntuple with Cherenkov and Shower Counter that you really have 10K electrons). The HMS run should take you of order <span style="color:red">one hour</span>, the SHMS run should take you about <span style="color:red">15 minutes</span>. Repeat the measurements (both SHMS and HMS) using the C optics ``extended" target, take in this case at least 100K statistics for SHMS, 40K statistics for HMS.
 
−
 
 
−
=== Sieve slit measurements to check spectrometer pointing [8 hrs <span style="color:red">?</span>] ===
 
−
 
 
−
<span style="color:red">Check rates</span>
 
−
 
 
−
Use the sieve slits, the Particle Id. trigger, and the 3% radiation length carbon target. If possible, use at least 50 μA (fast raster size of 1 by 1 mm2). Use a central momentum of -3.0 GeV/c, for both HMS and SHMS. Take a sieve slit spectrum with at least a few-K statistics (check in the ntuple to select electrons) for the following spectrometer angles: HMS at 12°, 20°, 30°, 40°, 50°; 60°, SHMS at 40°, 30°, 20°, 10°. You may need a few hours for the larger angles, 40° and higher. If needed, we can pick one of the larger HMS angles (say 50°).
 
−
 
 
−
=== Elastic Checkout [16 hrs] ===
 
−
 
 
−
<span style="color:red">Check rates</span>
 
−
 
 
−
Perform a series of 1H(e,e’)p elastic measurements to verify the optics and acceptance understanding of the spectrometers. '''IF''' we can get beam currents of 20 μA or higher you want to add some dummy runs (~15% of the time) such that this checkout can also be used for absolute calibrations! Assuming roughly a 6.4 GeV beam energy, rotate both HMS and SHMS to angles of 27.5° and set the momenta of both spectrometers to -3.609 GeV/c. Use a current of 50 μA and a fast raster with size 1 by 1 mm2. Use the large collimator, the Particle Id. trigger., and the 10 cm hydrogen target. Take runs to acquire roughly 10K events for HMS (use the large pion collimator!) at angles of 27.5°, 28.8°, 30.1°, 24.9°, and 26.2°. For SHMS at identical angles but also at angles of 31.8°, 33.5°, 35.2° and 23.2°. Roughly, at the central setting you need 45 minutes to acquire 10K statistics, and less at the lower angles, but perhaps 1.5 hour at 30.1°, and up to 5 hours at the largest SHMS angle of 35.2°.
 
−
 
 
−
=== Coincidence Checkout [16 hrs] ===
 
−
 
 
−
We will take a set of 1H(e,e’p) measurements to check the angle and dp/p offsets for the spectrometers. Use a current of 50 μA if possible. Rotate both HMS and SHMS to -27.5° again (or keep them there if already at that angle). Keep both HMS and SHMS at a central momentum of -3.609 GeV/c. First use the sieve slit on the SHMS side and the central Carbon optics target. Use the Particle Id. trigger, and measure about 2K singles in SHMS (that should take about one hour). Now install the 10 cm hydrogen target and measure about 2K singles in SHMS (that is again about one hour). Now take a coincidence spectrum in the same situation, again a measurement of about one hour. Remove the sieve slit on the SHMS side and use the large collimator. Measure a coincidence spectrum for one hour (rate should be 4 Hz, so this will get >10K statistics). Now install the sieve slit on the HMS side and measure another coincidence spectrum for a few hours (a few K statistics).
 
−
 
 
−
=== Current Monitor Calibration [1 hr] ===
 
−
 
 
−
Use a fast raster with size 1 by 1 mm2. Perform a current calibration using the following sequence: 20 μA, 0, 40 μA, 0, 60 μA, 0, 80 μA, 0, 100 μA, 0, each 1 minute long.
 
−
 
 
−
=== Current Dependence [2 hrs <span style="color:red">?</span>] ===
 
−
Use the fast raster with size 1 by 1 mm2. Monitor the HMS and SHMS electron rates continuously with the rates script! Increase the CW current from 10 μA to 60 μA (or 80 if easy to get) in steps of 10 μA. Take 250K statistics in these runs. Make sure you take with every run about 10 seconds of data without beam for current calibration purposes. Measure a 250K statistics run with the dummy target after each run with the hydrogen target, to get a zero baseline. Analyze the runs and check to what extent the yields depend on the current.
 
−
 
 
−
= <span style="color:red">TODO</span> =
 
−
 
 
−
* <span style="color:red">Need to check all kinematics and rates/times</span>
 
−
* <span style="color:red">We probably should do one series of runs with the sieve both before and after HB, to learn if we take HB well into account in the COSY/optics modelling of SHMS, but we were not sure where this would fit best.</span>
 

Latest revision as of 14:53, 29 January 2018

Beam energy of 2.2 GeV

Beam energy of 6.4 GeV

Initial conditions

  • HMS/SHMS Conditions:
HMS/SHMS collimator: PION , COLLIMATOR
HMS/SHMS trigger: SCIN 3/4, SCIN 3/4
HMS angle/momentum 15 deg, -3.0 GeV/c
SHMS angle/momentum 15 deg, -3.0 GeV/c

Beam Checkout with Superharps and Beam Position Monitors (3 hours)

  • Experts: Mark Jones, Deb Biswas, Thir Guatam
  • Expected time: 3 hours
  • Goals: Initial measurement of beam spot size. Followed by calibration of girder BPMs at 5,30 and 60uA. Measure raster size with superharps.
  • Conditions:
beam current: 5,30 and 60 μA
fast raster: off
target: none
  • Runplan: pdf file
  • Ask MCC to do superharp scan with superharps IHA3H07A and IHA3H07B and put entry in ELOG. Record the 3 BPMs positions (3H07A,3H07B,3H07C) during scan.
    • Want beam spot with sigma_x and sigma_y below 200 um ( beam pass 1-4) and below 300 um for beam pass 5.
  • Verify Girder BPM position to Harp positions.

Center beam on C-hole target ( 1 hour)

  • Experts:
  • Expected time: 1 hour
  • Goal: Center beam on carbon hole target
  • Conditions:
beam current: 5 μA
fast raster: 3x3mm
target: carbon hole
HMS/SHMS collimator: PION , COLLIMATOR
HMS/SHMS trigger: SCIN 3/4, SCIN 3/4
HMS angle/momentum 15 deg, -3.0 GeV/c
SHMS angle/momentum 15 deg, -3.0 GeV/c
  • Run plan: Procedure
  • Once hole is found, take 20 minutes run at 20uA for good statistics

Detailed Detector Checkout ( 2 hour)

  • Experts:
  • Expected time: 2 hour
  • Prerequisite: Eric Pooser will do invasive checkout of HMS/SHMS trigger with beam.
  • Conditions:
beam current: 20 μA
fast raster: off
target: 0.5% carbon
HMS/SHMS collimator: PION , COLLIMATOR
HMS/SHMS trigger: SCIN 3/4,SCIN 3/4
HMS angle/momentum 15 deg, -3.0 GeV/c
SHMS angle/momentum 15 deg, -3.0 GeV/c

Trigger

  • Set HMS/SHMS trigger threshold for PID trigger section to 10 mV.
  • Software cuts can be placed on trigger ADC data to study efficiencies.

Cerenkov

  • SHMS Noble Gas Run Plan: Scan of HV ( Eric Pooser)
Run 1 HV Settings: PMT1 = 2200 V, PMT2 = 2230 V, PMT3 = 2115, PMT4 = 2030
Run 2 HV Settings: PMT1 = 2300 V, PMT2 = 2320 V, PMT3 = 2215, PMT4 = 2130
    • These are the spring 2017 KPP HV settings for reference: NGC1 : 2255 V, NGC2 : 2280 V, NGC3 : 2165 V, NGC4 : 2087 V
    • We will also need to check the NGCER sum the PID trigger circuit to ensure that we are not saturating the FADC channel
  • Run plan (series of 15 minutes runs)
Run HMS DAQ SHMS DAQ Comments
1 No data taking Only 3/4 scin trigger Checkout of HMS 3/4 trigger ; SHMS NGC HV NGC1 : 2255 V, NGC2 : 2280 V, NGC3 : 2165 V, NGC4 : 2087 V
2 Only 3/4 scin trigger No data taking Checkout of SHMS 3/4 trigger
3 Only 3/4 scin trigger Only 3/4 scin trigger Checkout of HMS ELCLEAN/ELREAL trigger; SHMS NGC HV PMT1 = 2200 V, PMT2 = 2230 V, PMT3 = 2115, PMT4 = 2030
4 Only 3/4 scin trigger Only 3/4 scin trigger Checkout of HMS ELCLEAN/ELREAL trigger ; SHMS NGC HV PMT1 = 2300 V, PMT2 = 2320 V, PMT3 = 2215, PMT4 = 2130
5 Only ELCLEAN trigger Only 3/4 scin trigger Checkout of SHMS ELCLEAN/ELREAL trigger
6 Only ELREAL trigger Only 3/4 scin trigger Checkout of SHMS ELCLEAN/ELREAL trigger
7 ELREAL trigger, prescale 3/4 SCIN Only ELCLEAN
8 ELCLEAN trigger, prescale 3/4 SCIN Only ELREAL
9 ELCLEAN trigger, different prescale 3/4 SCIN ELREAL, prescale 3/4 scin

Checkout of SHMS/HMS focal plane tune ( 1 hour)

  • Experts:
  • Expected time: 1 hour
  • Goal: Look at focal plane with sieve to check tune
  • Conditions:
beam current: 20 μA
fast raster: off
target: 0.5% carbon
HMS/SHMS collimator: SIEVE , Centered sieve
HMS/SHMS trigger: SCIN 3/4,SCIN 3/4
HMS angle/momentum 15 deg, -3.0 GeV/c
SHMS angle/momentum 15 deg, -3.0 GeV/c

Different Pi/e ratios ( 1.5 hour)

  • Experts: SImona
  • Expected time: 1.5 hr
  • Goal:
    • Runs with different central momentum and different pi/e ratios.
    • Two runs with LH2 and one with LD2
    • Take each setting with only 3/4 scin trigger and for 30 minutes
    • Set PID tirgger thresholds to 10 mV. Offline will determine thresholds to test later.
  • Conditions:
beam current: 5-20 μA
fast raster: 2x2mm
target: 10cm LH2, 10cm LD2
HMS/SHMS collimator: Pion/Collimator
HMS/SHMS trigger: SCIN 3/4 / SCIN 3/4
SHMS/HMS angle/momentum 25. deg, -3.0 GeV/c, -1.4
  • Run Plan
HMS angle/mom SHMS angle/mom Target HMS/SHMS Trigger
25./-3.0 25./-3.0 10cm LH2 Only 3/4 scin
25./-1.4 25./-1.4 10cm LH2 Only 3/4 scin
25./-1.4 25./-1.4 10cm LD2 Only 3/4 scin

Defocused Tune for SHMS/HMS ( 1 hour)

  • Experts: Hamlet
  • Expected time: 1 hr
  • Goal: Have a wider y_fp to calibrate the calorimeter over regions that are not usually hit with the standard hourglass tune.
  • Conditions:
beam current: 5-20 μA
fast raster: 2x2mm
target: 10cm LH2
HMS/SHMS collimator: Pion/Collimator
HMS/SHMS trigger: SCIN 3/4 / SCIN 3/4
SHMS/HMS angle/momentum 25. deg, -3.0 GeV/c, Q2 at 1.2 times normal

Elastic p(ep) Checkout Small angle (2 hours)

  • Experts:
  • Expected time:
  • Goal:
  • Conditions:
beam current: 10 μA
fast raster: 1x1mm2
target: 10cm LH2
HMS/SHMS collimator: PION , COLLIMATOR
HMS/SHMS trigger: SCIN 3/4, SCIN 3/4
HMS angle/momentum 13.5/16. deg / 5.398/5.074 GeV
SHMS angle/momentum 8.,10.,13.5 deg / 6.017,5.814,5.398 GeV
  • Run plan
HMS Angle/Mom HMS rate SHMS Angle/Mom SHMS rate Run time
13.5/5.398 300 8./6.017 3300 Hz 15 minutes
13.5/5.398 300 10./5.817 1000 30 minutes
16.0/5.074 100 13.5/5.398 150 60 minutes

HMS/SHMS Angle and Position Matrix Optimization (5 hours)

  • Experts:
  • Expected time: 5 hours.
  • Goal:
  • Conditions:
beam current: 20 μA ( more is better)
fast raster: off
target: optics targets
HMS/SHMS collimator: Sieve , Centered/Shifted Sieve
HMS/SHMS trigger: 3/4 scin, 3/4 scin
HMS angle/momentum 15 and 22. deg,
SHMS angle/momentum 15. and 22. deg,
  • Series of runs changing target.
    • SHMS has two sieves with the holes shifted in the horizontal.
    • HMS has only one sieve which will always be used.
    • No raster.
    • Time is assuming 20uA.
Target HMS angle HMS momentum SHMS angle SHMS momentum SHMS collimator Time
0,+/- 10cm 15. deg -4.0 15. deg -4.0 Centered Sieve 30 min
0,+/- 10cm 15. deg -4.0 15. deg -4.0 Shifted Sieve 30 min
+/- 5cm 15. deg -4.0 15. deg -4.0 Centered Sieve 30 min
+/- 5cm 15. deg -4.0 15. deg -4.0 Shifted Sieve 30 min
0,+/- 10cm 22. deg -3.2 22. deg -3.2 Centered Sieve 1.5 hr
0,+/- 10cm 22. deg -3.2 22. deg -3.2 Shifted Sieve 1.5 hr

Large Ytar: HMS/SHMS Angle and Position Matrix Optimization (9 hours)

  • Experts:
  • Expected time: 9 hours.
  • Goal:
  • Conditions:
beam current: 20 μA
fast raster: off
target: optics targets
HMS/SHMS collimator: Sieve , Centered Sieve
HMS/SHMS trigger: 3/4 scin, 3/4 scin
HMS angle/momentum 30. deg, -2.0 GeV/c
SHMS angle/momentum 30. deg, -2.0 GeV/c

Check of ELREAL/ELCLEAN Trigger ( 1.5 hour)

  • Experts: SImona
  • Expected time: 1.5 hr
  • Goal:
    • Use threshold determined form previous LD2 running
    • Sanity check of electron triggers.
  • Conditions:
beam current: 20 μA
fast raster: 2x2mm
target: 10cm LH2
HMS/SHMS collimator: Pion/Collimator
HMS/SHMS trigger: Electron triggers
SHMS/HMS angle/momentum 25. deg, -3.0 GeV/c, -1.4
  • Run Plan
HMS angle/mom SHMS angle/mom Target HMS/SHMS Trigger Total DAQ Triggers
25./-3.0 25./-3.0 10cm LH2 Only 3/4 scin (prescale trig1=0,trig2=-1,trig3=-1) 300K
25./-3.0 25./-3.0 10cm LH2 ELREAL (prescale trig1=-1,trig2=0,trig3=-1) 300K
25./-3.0 25./-3.0 10cm LH2 ELCLEAN (prescale trig1=-1,trig2=-1,trig3=0) 300K
25./-1.4 25./-1.4 10cm LH2 Only 3/4 scin (prescale trig1=0,trig2=-1,trig3=-1) 300K
25./-1.4 25./-1.4 10cm LH2 ELREAL (prescale trig1=-1,trig2=0,trig3=-1) 300K
25./-1.4 25./-1.4 10cm LH2 ELCLEAN (prescale trig1=-1,trig2=-1,trig3=0) 300K

Coincidence Checkout [9 hrs]

  • Experts:
  • Expected time:
  • Goal:
  • Conditions:
beam current: 20-50 μA
fast raster: 2x2 mm2
target: 10cm LH2
HMS/SHMS collimator: PION/SIEVE , COLLIMATOR/CENTERED SIEVE
HMS/SHMS trigger: SCIN 3/4, SCIN 3/4
HMS angle/momentum 27.5 deg, -3.609 GeV/c
SHMS angle/momentum 27.5 deg, +3.609 GeV/c
  • Series of runs with/without collimator on electron side and switch polarities between HMS/SHMS.
  • Last run is used to evaluate accidentals.
HMS angle HMS momentum SHMS angle HMS collimator SHMS momentum SHMS collimator Time
27.5 deg +3.609 27.5 deg Pion -3.609 Collimator 30 min (4Hz at 20uA)
27.5 deg +3.609 27.5 deg Pion -3.609 Centered Sieve 2 hr
27.5 deg -3.609 27.5 deg Pion +3.609 Collimator 30 min (4Hz at 20uA)
27.5 deg -3.609 27.5 deg Sieve +3.609 Collimator 2 hr
27.5 deg -3.609 35.0 deg Pion +3.609 Collimator 1 hr

Additional Large Ytar: HMS/SHMS Angle and Position Matrix Optimization (6 hours)

  • Experts:
  • Expected time: 6 hours.
  • Goal:
  • Conditions:
beam current: 65 μA
fast raster: 2x2
target: optics targets
HMS/SHMS collimator: Sieve , Centered Sieve
HMS/SHMS trigger: 3/4 scin, 3/4 scin
HMS angle/momentum 25.5,22 deg, -2.6,-3.2 GeV/c
SHMS angle/momentum 30.,22 deg, -2.0,-3.2 GeV/c
  • Run Plan: Time is assuming 65uA. Take one hour long runs. Should take about 5 hours for +/-10cm data and 1 hour for +/-5cm data.
Target HMS angle HMS momentum SHMS angle SHMS momentum SHMS collimator Counts
0,+/- 10cm 25. deg -2.6 30. deg -2.0 Centered Sieve Total of 4.0M SHMS triggers.
+/- 5cm 22. deg -3.2 22. deg -3.2 Centered Sieve Total of 1.0M SHMS Triggers.

Additional Coincidence Checkout [3 hr]

  • Conditions:
beam current: 65 μA
fast raster: 2x2 mm2
target: 10cm LH2
HMS/SHMS collimator: PION , COLLIMATOR
HMS/SHMS trigger: Coincidence
HMS angle/momentum Various
SHMS angle/momentum Various
  • Run Plan:
    • HMS is detecting electrons and SHMS is detecting protons.
    • Use HMS pion collimator and SHMS collimator.
    • Cycle SHMS for each change when raising momentum
Target Prescales HMS angle HMS momentum SHMS angle SHMS momentum Time
LH2 ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 22.0 deg -4.284 33.3 deg +2.925 30 min (65Hz)
0.5% carbon ps1=0,ps2=-1,ps3=-1,ps4=0,ps5=-1,ps6=-1 22.0 deg -4.284 33.3 deg +2.925 10min
0.5% carbon ps1=0,ps2=-1,ps3=-1,ps4=0,ps5=-1,ps6=-1 35.0 deg -2.869 22.0 deg +4.38 10 min
LH2 ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 35.0 deg -2.869 22.0 deg +4.38 30 min (6Hz)
LH2 ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 50.0 deg -1.864 15.3 deg +5.41 1.5 hrs (0.6Hz)
0.5% carbon ps1=0,ps2=-1,ps3=-1,ps4=0,ps5=-1,ps6=-1 50.0 deg -1.864 15.3 deg +5.41 10 min
  • Run until 8am when Jay Benesch in MCC will do the beam energy measurement.

Beam Energy Measurement (3 hours)

  • Experts: MCC, Jay Benesch
  • Expected time: 3 hours
  • Goal: Measure beam energy for elastics
  • Conditions:
beam current: 5uA
fast raster: off
target: none
  • MCC procedure

Target LH2/LD2 boiling study

  • Experts: Eric Pooser
  • Expected time:
  • Goal: Measure target boiling.
  • Conditions:
beam current (uA): 2, 7, 10, 20, 30, 40, 50, 60, 65
fast raster: 2x2mm
target: 10cm LH2, 10cm LD2, 0.5% Carbon, *Al 10 cm Dummy only at 20 and 40 muA*
SHMS/HMS collimator: Collimator/PION
SHMS trigger: SCIN 3/4
SHMS angle/momentum: 15 deg / -3 GeV/c
HMS trigger: SCIN 3/4
HMS angle/momentum: 15 deg / -3 GeV/c
  • Run Plan:
    • Set spectrometers to above settings
    • For each target, do nine separate runs for each current and take 200,000 events.
Target Trigger Currents
10cm LH2 ps1=#, rest to -1, Set # so deadtime is 20% 2, 7, 10, 20, 30, 40, 50, 60, 65
10cm LD2 ps1=#, rest to -1, Set # so deadtime is 20% 2, 7, 10, 20, 30, 40, 50, 60, 65
0.5% carbon ps1=#, rest to -1, Set # so deadtime is 20% 2, 7, 10, 20, 30, 40, 50, 60, 65
10 cm dummy ps1=#, rest to -1, Set # so deadtime is 20% 20,40

Final Checkout of SHMS ELREAL/ELCLEAN Trigger ( 3 hour)

  • Experts: Simona Malace
  • Expected time: 3 hr
  • Goal:
    • Take data to determine thresholds.
    • Sanity check of electron triggers.
  • Conditions:
beam current: 65 μA
fast raster: 2x2mm
target: 10cm LH2
SHMS collimator: Collimator
SHMS trigger: Various triggers
SHMS angle/momentum 25. deg, -3.0 GeV/c, -1.4
  • Run Plan
    • Take run with 3/4 and threshold at 10mV
    • Take run with 3/4 and thresholds at: SHMS (PRLO = 10 mV, PRHI = 15 mV, CER = 10 mV)
    • Take run with ELREAL only trigger
    • Take run with ELCLEAN trigger
    • Analyze results and confirm that expected efficiencies are achieved.
    • Lower spectrometer momentum to -1.4 GeV to increase pi/e ratio.
    • Repeat all of above
SHMS angle/mom Target SHMS Trigger Trigger Thresholds Total DAQ Triggers
25./-3.0 10cm LH2 Only 3/4 trigger All PID legs to 10mV 300K
25./-3.0 10cm LH2 Only 3/4 trigger SHMS PID legs to: PRLO = 10mV, PRHI = 15 mV, CER =10 mV 300K
25./-3.0 10cm LH2 Only ELREAL SHMS PID legs to: PRLO = 10mV, PRHI = 15 mV, CER =10 mV 300K
25./-3.0 10cm LH2 Only ELCLEAN SHMS PID legs to: PRLO = 10mV, PRHI = 15 mV, CER =10 mV 300K
25./-1.4 10cm LH2 Only 3/4 trigger All PID legs to 10mV 300K
25./-1.4 10cm LH2 Only 3/4 trigger SHMS PID legs to: PRLO = 10mV, PRHI = 15 mV, CER =10 mV 300K
25./-1.4 10cm LH2 Only ELREAL SHMS PID legs to: PRLO = 10mV, PRHI = 15 mV, CER =10 mV 300K
25./-1.4 10cm LH2 Only ELCLEAN SHMS PID legs to: PRLO = 10mV, PRHI = 15 mV, CER =10 mV 300K

SHMS Elastic Single arm Checkout Additional angles (4 hours)

  • Experts:
  • Expected time:
  • Goal:
  • Conditions:
beam current: 65uA
fast raster: 2x2mm2
target: 0.5% carbon, 10cm LH2
SHMS collimator: PION , COLLIMATOR
SHMS trigger: SCIN 3/4, SCIN 3/4
SHMS angle/momentum 16,20 ,30,35 deg / 5.074,4.522,3.349,2.869 GeV
  • Run plan
    • Take 15 min run with 0.5% carbon. Run LH2 for 10,000 events in elastic W for SHMS at 16 deg.
    • Take 15 min run with 0.5% carbon. Run for 10,000 events in elastic W for SHMS at 20 deg
    • Take 15 min run with 0.5% carbon. Run for 10,000 events in elastic W for SHMS at 30 deg
    • Take 15 min run with 0.5% carbon. Run for 10,000 events in elastic W for SHMS at 35 deg

CT Physics [53 hrs]

  • Conditions:
beam current: 65 μA
fast raster: 2x2 mm2
target: 10cm LH2
HMS/SHMS collimator: PION , COLLIMATOR
HMS/SHMS trigger: Coincidence
HMS angle/momentum Various
SHMS angle/momentum Various
  • Run Plan:
    • HMS is detecting electrons and SHMS is detecting protons.
    • Use HMS pion collimator and SHMS collimator.
    • Keep track of good coincidence physics events (with tight PID cuts and coincidence time cut) such that we have 10000 events each for LH2 and Carbon
Target Prescales HMS angle HMS momentum SHMS angle SHMS momentum Time
LH2 ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 45.1 deg -2.131 17.1 deg +5.122 12 hrs
LH2 ps1=0,ps2=-1,ps3=-1,ps4=0,ps5=-1,ps6=-1 45.1 deg -2.131 17.1 deg +5.122 30 min
Al. Dummy ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 45.1 deg -2.131 17.1 deg +5.122 4 hrs
6% C ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 45.1 deg -2.131 17.1 deg +5.122 36 hrs
6% C ps1=0,ps2=-1,ps3=-1,ps4=0,ps5=-1,ps6=-1 45.1 deg -2.131 17.1 deg +5.122 30 min
  • If possible after completing the LH2 and Dummy we can move to F2 Physics program and come back to the Carbon after the F2 physics program

F2 Physics

Remaining Commissioning

SHMS Elastic Single arm Checkout Additional angles (4 hours)

  • Experts:
  • Expected time:
  • Goal:
  • Conditions:
beam current: 65uA
fast raster: 2x2mm2
target: 10cm LH2
SHMS collimator: COLLIMATOR/Center sieve
SHMS trigger: SCIN 3/4
SHMS angle/momentum 25 ,30 / -3.911,-3.349
  • Run plan
    • Take data at SHMS angle = 25 and momentum = -3.911 with collimator for 30 minutes.
    • Take data at SHMS angle = 25 and momentum = -3.911 with centered Sieve for 1 hour.
    • Take data at SHMS angle = 25 and momentum = -3.6 with collimator for 30 minutes.
    • Take data at SHMS angle = 25 and momentum = -3.349 with collimator for 30 minutes.
    • Take data at SHMS angle = 30 and momentum = -3.349 with collimator for 1 hour.
    • Take data at SHMS angle = 30 and momentum = -3.349 with centered sieve for 2 hour.



22 deg Ytar: SHMS Angle and Position Matrix Optimization (1 hours)

  • Experts:
  • Expected time: 1 hours.
  • Goal: Need more optics data for SHMS at large angles.
  • Conditions:
beam current: 65 μA
fast raster: 2x2
target: 0,+/- 10cm
SHMS collimator: Centered Sieve,Shifted Sieve
SHMS trigger: ELREAL
SHMS angle/momentum 22 deg, -3.2 GeV/c
  • Run Plan: Take during switch in HMS polarity. Time is assuming 65uA.
Target SHMS angle SHMS momentum SHMS collimator Time
0,+/- 10cm 22. deg -3.2 Centered Sieve 30 minutes
0,+/- 10cm 22. deg -3.2 Shifted Sieve 30 minutes

SHMS Low momentum electrons and large angle (3 hours)

  • Experts: Eric Christy
  • Expected time: 3 hours.
  • Goal:
  • Conditions:
beam current: 65 μA, 40uA (Aluminum dummy)
fast raster: 2x2
target: 10cm Lh2, 10cm Al dummy
SHMS collimator: collimator
SHMS trigger: ELREAL
SHMS angle/momentum 35 deg, -2.6 GeV/c
  • Run Plan: Take while HMS with positive polarity is taken. Time is assuming 65uA.
Target SHMS angle SHMS momentum Time
10cm Lh2 35. deg -2.6 2 hours
10cm 35. deg -2.6 20 minutes

30 deg Ytar: HMS/SHMS Angle and Position Matrix Optimization (3 hours)

  • Experts:
  • Expected time: 3 hours.
  • Goal: Need more optics data for SHMS at large angles.
  • Conditions:
beam current: 65 μA
fast raster: 2x2
target: optics targets
SHMS collimator: Centered Sieve
SHMS trigger: ELREAL
SHMS angle/momentum 30. deg, -2.0 GeV/c
  • Run Plan: Time is assuming 65uA. Take one hour long runs.
Target SHMS angle SHMS momentum SHMS collimator Time
0,+/- 10cm 30. deg -2.0 Centered Sieve 3 hours

Repeat Target LH2 boiling study with new SHMS sheilding

  • Experts:
  • Expected time:
  • Goal: With new SHMS shielding reconfiguration, repeat LH2 measurement and see if background reduced.
  • Conditions:
beam current (uA): 10, 30 , 65
fast raster: 2x2mm
target: 10cm LH2
SHMS/HMS collimator: Collimator/PION
SHMS trigger: SCIN 3/4
SHMS angle/momentum: 15 deg / -3 GeV/c
  • Run Plan:
Target Trigger Currents
10cm LH2 ps1=#, rest to -1, Set # so deadtime is 20% 10, 30, 65

Lower priority

Beam energy of 10.6 GeV

Beam Energy Measurement

  • Experts: MCC,Mark Jones, Dave Mack
  • Expected time: ? hours
  • Goal: Measure beam energy for carbon elastics.
  • Conditions:
beam current: 5uA
fast raster: off
target: none
  • MCC procedure


HMS/SHMS Tune Verification

  • Experts:
  • Expected time:
  • Goal:
    • Mix of ep elastic data, and carbon data to check SHMS tune.
    • Also LH2 inelastic to calibrate the calorimeter.
  • Conditions:
beam current: max current μA
fast raster: 2x2
target: 1.5% carbon, 10 LH2
HMS/SHMS collimator: PION/SIEVE , COLLIMATOR/Centered Sieve
HMS/SHMS trigger: SCIN 3/4, SCIN 3/4
HMS angle/momentum see table
SHMS angle/momentum see table
  • Run Plan
Target HMS angle HMS momentum HMS collimator SHMS angle SHMS momentum SHMS collimator Time
LH2 18.5 deg -6.693 pion 8.5 deg -9.430 Collimator 30 min
LH2 18.5 deg -6.693 Pion 8.5 deg -7.3 Collimator 30 min
1.5% carbon 18.5 deg -5.816 Sieve 8.5 deg -7.3 Centered Sieve 1 hr
LH2 18.5 deg -5.816 Pion 16.5 deg -7.234 Collimator 1 hr
LH2 18.5 deg -5.816 Pion 16.5 deg -5.5 Collimator 1 hr
1.5% carbon 18.5 deg -5.816 Sieve 16.5 deg -5.5 Centered Sieve 2 hr

BCM Calibration ( 1 hour)

Use GEM to check out SHMS optics

  • Experts: Latif
  • Expected time:
  • Goal:
  • Conditions:
beam current: <1 μA
fast raster: off
target: optics targets
SHMS collimator: Collimator
SHMS trigger: 3/4 Scin + Cer
SHMS angle/momentum 25. deg, -2.0 GeV/c
  • Run Plan:
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