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CT Experiment (E1206107) Run Plan

The 6.4 GeV Run Plan (52 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.
    • Start with 30uA on lower 6% Carbon, after a 2 hr run, increase to 40 uA and after another 2 hr run move to the upper 6% Carbon and ask for 50 uA.
    • Keep track of good coincidence physics events (with tight PID cuts and coincidence time cut) such that we have 10000 events for LH2 and Carbon
Target Prescales HMS angle HMS momentum SHMS angle SHMS momentum Time Complete
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 Y
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 Y
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 Y
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 Y
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 Y

The 10.6 GeV Run Plan (282 hrs)

  • Conditions:
beam current: 65 μA
fast raster: 2x2 mm2
target: 10cm LH2
HMS/SHMS collimator: LARGE , 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.
  • H(e,e'p) Check
Target Prescales HMS angle HMS momentum SHMS angle SHMS momentum Time Complete
LH2 ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 23.2 deg -5.539 21.6 deg +5.925 4 hrs (3 Hz) Y
  • Q^2 = 14.3 GeV^2 Run Plan
    • Cycle SHMS magnets since raising momentum
    • Keep track of good coincidence physics events (with tight PID cuts and coincidence time cut) such that we have 1000 events each for LH2 and Carbon and take two singles run 30 mins each at the beginning and end of the running on a particular target.
    • For the singles runs the prescale factor on SHMS should be adjusted as needed to get about equal rate in HMS and SHMS (ie equal rates for PS1 and PS4).
Target Prescales HMS angle HMS momentum SHMS angle SHMS momentum Time Complete
LH2 ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 39.3 deg -2.982 12.8 deg +8.505 36 hrs Y
LH2 ps1=0,ps2=-1,ps3=-1,ps4=0,ps5=-1,ps6=-1 39.3 deg -2.982 12.8 deg +8.505 1 hr Y
Al. Dummy ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 39.3 deg -2.982 12.8 deg +8.505 3 hrs Y
6% C ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 39.3 deg -2.982 12.8 deg +8.505 122 hrs Y
6% C ps1=0,ps2=-1,ps3=-1,ps4=0,ps5=-1,ps6=-1 39.3 deg -2.982 12.8 deg +8.505 1 hr Y
  • Q^2 = 11.5 GeV^2 Run Plan
    • Cycle HMS magnets since raising momentum
    • Keep track of good coincidence physics events (with tight PID cuts and coincidence time cut) such that we have 1000 events each for LH2 and Carbon
    • For the singles runs the prescale factor on SHMS should be adjusted as needed to get about equal rate in HMS and SHMS (ie equal rates for PS1 and PS4).
Target , current Prescales HMS angle HMS momentum SHMS angle SHMS momentum Time Complete
6% C, 50uA ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 28.5 deg -4.478 17.8 deg +7.001 18.5 hrs In progress
6% C, 50 uA ps1=0,ps2=-1,ps3=-1,ps4=0,ps5=-1,ps6=-1 28.5 deg -4.478 17.8 deg +7.001 30 min Y
LH2, 65 uA ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 28.5 deg -4.478 17.8 deg +7.001 3.5 hrs Y
LH2, 65 uA ps1=0,ps2=-1,ps3=-1,ps4=0,ps5=-1,ps6=-1 28.5 deg -4.478 17.8 deg +7.001 30 min Y
Al. Dummy, max allowed ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 28.5 deg -4.478 17.8 deg +7.001 1 hrs Y
  • Q^2 = 10.0 GeV^2 Run Plan for checking radiative corrections.
    • Cycle HMS magnets since raising momentum
    • Keep track of good coincidence physics events (with tight PID cuts and coincidence time cut) such that we have 800 events on 1.5% Carbon
Target Prescales HMS angle HMS momentum SHMS angle SHMS momentum Time Complete
1.5% C ps1=-1,ps2=-1,ps3=-1,ps4=-1,ps5=-1,ps6=0 24.5 deg -5.259 20.6 deg +6.209 12 hrs N

F2 Experiment (E12-10-002) L/T measurement Run Plan

  • Experts: Simona Malace, Eric Christy
  • Expected time: 2 days at 30 muA
  • Goal: Measure one epsilon point to better constrain R at large x
  • Conditions: ONLY HMS NEEDED. Prescale to 2 kHz, cycle magnets.
beam current (uA): max current
fast raster: 2x2mm
target: 10 cm LH2, Al 10 cm Dummy
HMS collimator: PION
HMS trigger: ELREAL for physics data taking
HMS trigger: SCIN 3/4 *for one run only* in the beginning for trigger efficiency calculation (we are running one trigger at the time)
HMS angle/momentum: 65 deg / -1 GeV/c - 100 K electrons
HMS angle/momentum: 65 deg / +1 GeV/c - 10 K positrons

F2/EMC Experiment (E12-10-002/E12-10-008) 5 pass Run Plan

  • Spokespeople E12-10-002: E. Christy, T. Keppel, S. Malace (contact), I. Niculescu
  • Graduate Students E12-10-002: Deb Biswas, Abel Sun, Fernando Araiza Gonzalez
  • Spokespeople E12-10-008: J. Arrington, A. Daniel, D. Gaskell (contact), N. Fomin
  • Graduate Students E12-10-008: Abishek Karki, Kayla Craycraft
  • Conditions:
beam current: varies per target
fast raster: 2x2 mm2
targets: 10cm LH2 and LD2, 10 cm Al Dummy, Be, 10,11B, C 1.5 %
HMS/SHMS collimator: Large , COLLIMATOR
HMS/SHMS trigger: ELREAL/ELREAL for NEG. Polarity runs; ELCLEAN/ELCLEAN for POS. Polarity runs
HMS angle/momentum Various (check run plan below)
SHMS angle/momentum Various (check run plan below)


HMS Dipole saturation check run plan (3-4 hrs):

  • Conditions:
  • Run Plan:
    • Perform HMS e-p elastic checks at 21 degrees and use position of elastic peak to check for dipole saturation for 2 momenta.
    • SHMS will be set at 21 degrees and a central momentum of -5.7 GeV for the entire study
    • Both HMS and SHMS detecting electrons.
    • Use HMS pion collimator and SHMS collimator.
    • All runs take with ps1 = 0, ps2 = ps3 = ps4 = ps5 = ps6 = -1
beam current: 60 μA or maximum available
fast raster: 2x2 mm2
targets: 10cm LH2, 10cm dummy
HMS/SHMS collimator: PION, COLLIMATOR
HMS/SHMS trigger: singles
Target HMS angle HMS momentum Time
LH2 21.00 deg -6.1 1 hr
10cm Dummy 21.00 deg -6.1 20 min
LH2 21.00 deg -5.9 1 hr
10cm Dummy 21.00 deg -5.9 20 min


  • Production Run Plan:

SHMS Production Run Plan

HMS Production Run Plan


  • Online Analysis Flow: shift takers! follow closely, please

F2/EMC analysis how-to for shift takers


  • Simona's notes

Daily to do list

Deuteron Electro-Disintegration (E12-10-003) Run Plan

  • Experts: Werner Boeglin, Mark Jones
  • Graduate Student: Carlos Yero
  • Expected Time: 6 days at 70 uA
  • Goal: Measure D(e,e'p)n cross section at three kinematic settings, where FSI are small
  • Conditions: The SHMS will detect electrons and the HMS will detect protons.
beam energy: 10.6 GeV
beam current: 40 μA
fast raster: 2x2 mm
targets: 10cm LH2, 10cm LD2
HMS/SHMS collimator: Pion , Collimator
HMS/SHMS trigger: Coincidence, HMS: h3/4, SHMS: p3/4
HMS angle/momentum Various
SHMS angle/momentum Fixed
  • H(e,e'p) Check Run Plan
    • Check the HMS/SHMS spectrometer pointing
Target SHMS angle SHMS momentum HMS angle HMS momentum Time
LH2 12.169 deg -8.70 GeV/c 37.339 deg +2.938 GeV/c 1 hr
  • D(e,e'p)n Run Plan
    • Calibration run at low missing momentum used as a cross check with existing data
    • Measure the D(e,e'p)n Cross Section at unexplored high missing momentum kinematics settings
Target SHMS angle SHMS momentum HMS angle HMS momentum Missing Momentum Time
LD2 12.169 deg -8.70 GeV/c 38.896 deg +2.932 GeV/c 80 MeV 1 hr

Alternative Run Plan (Assuming Beam Current of 65-70 uA)

  • The initial H(e,e'p) checkout and D(e,e'p)n at low missing momentum is the SAME as above.
LD2 12.169 deg -8.70 GeV/c 53.252 deg +2.305 GeV/c 500 MeV 8 hrs
LD2 12.169 deg -8.70 GeV/c 56.401 deg +2.220 GeV/c 650 MeV 18 hrs
LD2 12.169 deg -8.70 GeV/c 59.388 deg +2.120 GeV/c 800 MeV 36 hrs

Fall 2017 Commissioning Plans

Spring 2017 KPP run

Hall C Links

Hall C

Hall C is one of four experimental halls at JLab.

Hall C Computing.

Hall C in the Press.

Basic Equipment in Hall C

Beamline

SHMS Magnets

For the Fall 2017 run, see intructions at https://hallcweb.jlab.org/wiki/index.php/How-to

The formulas and program should be kept in sync with the repository.


  • Formulas used for setting current of SHMS magnets during KPP
Magnet Formula
HB Current = 330.05*p - 3.1784*p^2 + 0.4018*p^3
Q1 Current = 222.4*p - 7.709*p^2 + 0.6684*p^3
Q2 Current = 3661*p/11
Q3 Current = 2434*p/11
Dipole Current = 3450*p/11

Scattering Chamber

  • The scattering chamber window on the SHMS side is 0.020 inches thick 2024-T4 aluminum.

SHMS Entrance Window and Vacuum vessel

  • The Horizontal Bender entrance window is 0.010 inches thick 2024-T3 aluminum.
  • The dipole exit window is 0.020 inches thick 5056 aluminum.

Target

Spring 2017 KKP run

Fall 2017 run

  • Logbook entry on the Fall target configuration which has links to file describing the targets and their thicknesses and a file with the mechanical drawing of the target ladder.
  • BeO target was replaced by the "halo" cylinder target. Logbook entry with drawing of "halo" cylinder target.
  • Drawing of target ladder with cryo cells and solid target ladder.
  • Drawing of cryotarget cell with 2.5inch diameter and 10 cm long (after using insert entrance window). Used for separate LH2 and LD2 cells in ladder.
  • Drawing of cryotarget with 1.6 inch diameter for 4cm cell.
  • Drawing of cryotarget with 1.6 inch diameter for 10cm cell.

HMS Magnets and Vacuum Vessel

HMS Detectors

SHMS Detectors

DAQ & Trigger

Controls

  • High Voltage
  • Spectrometer Controls (Use go_cmagnets command)
  • HMS and SHMS Collimator Control document.

Online Replay

Data Analysis

Monte Carlo

Hall C at 12 GeV

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