Difference between revisions of "E12-09-017 Run Plan"

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(Settings to monitor during shift)
(Experimental setup)
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== Experimental setup ==
 
== Experimental setup ==
 
* '''HMS''' spectrometer will be detecting electrons.  
 
* '''HMS''' spectrometer will be detecting electrons.  
* '''SHMS''' Spectrometer will run both positive and negative pi/K
+
* '''SHMS''' Spectrometer will run both positive and negative pi/K.
  
 
== Settings to monitor during shift ==
 
== Settings to monitor during shift ==

Revision as of 18:09, 11 April 2018

E12-09-017 Run Plan

Goal

The goal of the experiment is to measure the pt-dependence of SIDIS from proton, deuteron, and aluminum targets, for final state pi+, pi-, K+, and K-. The goal is to measure absolute cross sections with particular attention to achieving small errors on the ratios of cross sections for different final states and targets. The beam single-spin asymmetry will also be measured at the settings with sufficient phi coverage.

Experimental setup

  • HMS spectrometer will be detecting electrons.
  • SHMS Spectrometer will run both positive and negative pi/K.

Settings to monitor during shift

  • Beam energy: 10.6 GeV. Raster 2x2
  • Beam current:
    • For most settings we can hopefully take 55 to 60 muA beam current.
    • At SHMS forward angles, we will have to run at lower currents in order to keep the DC rates below 500 KHz and the real/accidentals ratio less than 1 to 1.
  • Trigger:
    • Main trigger is 3/4 Hodo in HMS in coincidence with 3/4 Hodo in SHMS (same as for CT experiment).
    • We will also trigger on HMS singles with a pre-scale factor. We will also have some EDT triggers.
  • Prescale: PS6 0 all the time. Set PS4 prescale to 9.

Settings to change according to run plan

  • Targets: for each kinematic setting, record runs for LH2, dummy, LD2
  • SHMS polarity: record each kinematic setting for both positive and negative SHMS polarity
  • Run time:
    • Except for the low current runs, the goal is to collect about 150 mC of charge for each of LH2 and LD2, using three runs lasting about 20 minutes each.
    • It is acceptable to be within 20% of the goal (so anywhere from 120 to 180 mC is ok for the nominal 150 mC runs).
    • For the lower current runs, the goal is 150 mC times square root of the current used divided by 40 muA. So for 10 muA, the goal is 75 mC.
    • The dummy runs should be for half the length of each of the liquid target runs (so about 70 mC in except for the low current runs).

Kinematic Settings

 S#  means setting number
 nom  current is the current for which rates are calculated (on LH2). It is fine to run at higher currents (preferably around 60 uA), except of course on the dummy target (40 uA).
 RHMS  is the expected HMS single arm HODO rate
 RSHMS  is the predicted SHMS single arm HODO rate
 evnts  is the predicted number of good e, pi coincidences per hour
 acid/rad  is the predicted accidental to real ratio in the coincidence time peak for pions
 trg6  is the predicted coincidence trigger rate in Hz

set SHMS to positive polarity

kine group: 1

    HMS   HMS   SHMS  SHMS                            nom   RHMS RSHMS evnts accid/ trg6
S#    P Theta      P Theta    x   Q2    z   p_t   W'2   muA   Khz   kHz kHz/hr real    Hz  Done?
1  -5.27  13.5  5.05  12.0 0.31 3.10 0.90 -0.06  1.16  40.0  11.3  28.5  24.6  0.06  16.6  yes
2  -5.27  13.5  5.05  14.0 0.31 3.10 0.90  0.12  1.14  40.0  11.3  10.6  23.8  0.02   9.3  yes
3  -5.27  13.5  3.37  12.0 0.31 3.10 0.60 -0.04  3.35  40.0  11.3 178.1  99.4  0.16 140.0
4  -5.27  13.5  3.37  14.0 0.31 3.10 0.60  0.08  3.34  40.0  11.3  81.1  97.8  0.07  78.0
5  -5.27  13.5  2.53   8.0 0.31 3.10 0.45 -0.21  4.35  13.5   3.8 476.2  23.5  0.63 108.9
6  -5.27  13.5  2.53  10.0 0.31 3.10 0.45 -0.12  4.41  22.8   6.4 472.9  46.2  0.54 186.6
7  -5.27  13.5  2.53  12.0 0.31 3.10 0.45 -0.03  4.44  39.6  11.2 470.3  89.5  0.49 327.1
8  -5.27  13.5  2.53  14.0 0.31 3.10 0.45  0.06  4.44  40.0  11.3 265.6  88.3  0.28 197.5
9  -5.27  13.5  2.53  16.0 0.31 3.10 0.45  0.15  4.40  40.0  11.3 145.5  80.8  0.17 117.3
10 -5.27  13.5  2.53  18.0 0.31 3.10 0.45  0.23  4.32  40.0  11.3  78.1  66.3  0.11  69.2
11 -5.27  13.5  2.53  20.0 0.31 3.10 0.45  0.32  4.21  40.0  11.3  41.0  58.9  0.07  43.0
12 -5.27  13.5  2.53  22.0 0.31 3.10 0.45  0.41  4.07  40.0  11.3  21.1  36.5  0.05  23.7
13 -5.27  13.5  2.53  24.0 0.31 3.10 0.45  0.50  3.89  40.0  11.3  10.6  21.3  0.05  12.7
14 -5.27  13.5  2.53  26.0 0.31 3.10 0.45  0.58  3.68  40.0  11.3   5.2  16.2  0.03   7.8

set SHMS to negative polarity

kine group: 1

    HMS   HMS    SHMS    SHMS                              nom   RHMS RSHMS evnts accid/ trg6
S#    P Theta       P   Theta     x   Q2    z   p_t   W'2   muA   Khz   kHz kHz/hr real    Hz   Done? 
 1   -5.27  13.5  -5.05   12.0  0.31 3.10 0.90 -0.06  1.16  40.0  11.3  28.5  24.6  0.06  16.6
 2   -5.27  13.5  -5.05   14.0  0.31 3.10 0.90  0.12  1.14  40.0  11.3  10.6  23.8  0.02   9.3
 3   -5.27  13.5  -3.37   12.0  0.31 3.10 0.60 -0.04  3.35  40.0  11.3 178.1  99.4  0.16 140.0
 4   -5.27  13.5  -3.37   14.0  0.31 3.10 0.60  0.08  3.34  40.0  11.3  81.1  97.8  0.07  78.0
 5   -5.27  13.5  -2.53    8.0  0.31 3.10 0.45 -0.21  4.35  13.5   3.8 476.2  23.5  0.63 108.9
 6   -5.27  13.5  -2.53   10.0  0.31 3.10 0.45 -0.12  4.41  22.8   6.4 472.9  46.2  0.54 186.6
 7   -5.27  13.5  -2.53   12.0  0.31 3.10 0.45 -0.03  4.44  39.6  11.2 470.3  89.5  0.49 327.1
 8   -5.27  13.5  -2.53   14.0  0.31 3.10 0.45  0.06  4.44  40.0  11.3 265.6  88.3  0.28 197.5
 9   -5.27  13.5  -2.53   16.0  0.31 3.10 0.45  0.15  4.40  40.0  11.3 145.5  80.8  0.17 117.3
 10  -5.27  13.5  -2.53   18.0  0.31 3.10 0.45  0.23  4.32  40.0  11.3  78.1  66.3  0.11  69.2
 11  -5.27  13.5  -2.53   20.0  0.31 3.10 0.45  0.32  4.21  40.0  11.3  41.0  58.9  0.07  43.0
 12  -5.27  13.5  -2.53   22.0  0.31 3.10 0.45  0.41  4.07  40.0  11.3  21.1  36.5  0.05  23.7
 13  -5.27  13.5  -2.53   24.0  0.31 3.10 0.45  0.50  3.89  40.0  11.3  10.6  21.3  0.05  12.7
 14  -5.27  13.5  -2.53   26.0  0.31 3.10 0.45  0.58  3.68  40.0  11.3   5.2  16.2  0.03   7.8

MORE KINEMATIC SETTING TO COME SOON