Wiki-page for E12-11-112

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Overview

E12-011-112 (x>1) at Hall A is proposed to precisely measure the isospin dependence of two-nucleon short range correlations using mirror nuclei 3H and 3He. More details can be found in the PAC38 Proposal and Patricia's web page.

Trigger configuration

  • All run were taken at single arm mode ( inclusive e' ).

LHRS (run number <20000): 

T1:  S0 && S2
T2: (S0 && S2) && Cer
T3: (S0 || S2) && Cer

RHRS (run number >90000): 

T4:  S0 && S2
T5: (S0 && S2) && Cer
T6: (S0 || S2) && Cer


Run Periods

Fall 2018

Date LHRS RHRS
09.18.2018 17 degree 24 degree
10.30.2018 28 degree
  • Issues:
  1. BCM new receiver gain changed during optics run
  2. wierd BPM Y signal ( seems a noise pickup from beamline, went away by itself [1] [2] )
  3. PS 25 and SH39 not connected until sept 30
  4. LQ2 cycle at 1600 A which is lower than the default setting for 3.82 and 3.93 GeV. Since this was how we set up magnets during optics run, live with it.
  5. LHRS L1A signal is noisy but Trigger rate and ADC gate rate is good (https://logbooks.jlab.org/entry/3602167), fixed during the Oct 9 hall access
  6. run 3581, 3582 have wrong Q1 current ( 882.8A instead of 875 A)
  7. suspicious hotspot on raster pattern during the L17-SRC1 runs ( hitting the collimator?)
  8. RHRS shower gate adjusted on Oct 09, need a new calibration
  9. Run 3912-3919 LQ1 regulator on
  10. Raster1 has been off since Oct 14.
  11. Oct 14 - Oct 20: beam dump vacuum leak, target 15k valve leak, etc...
  12. Oct 21-23: LQ3 tripped several times. RD quench.
  13. Starting from run 94026 on RHRS after RD revived, saw noise when T6 turned on. Kept T6 off till the end. This will affect R28-LS, R28-HS, and the inelastic data we took in the last day. ( starting from run 93822 - right after move to 28 degree, s2 trigger eff dropped to ~95%. DR.tS2coinc spectrum different from before).
  14. small hydrogen contamination in the new Tritium cell.

Spring 2018

Calibrations

December 2017

  • Beam Energy: 1 pass (2.216 GeV)
  • Targets: 3H, 3He, 2H, 1H
  • Run plan: spreadsheet

Calibration Runs

  • BPM
  • BCM
  • Optics
Run number Description
757, 758 LHRS BPM pedestal runs
90357, 90358 RHRS BPM pedestal runs
805 - 810 LHRS harp scan
90595- 90600 RHRS harp scan
814 - 819 LHRS BCM calibration
90604- 90608 RHRS BCM calibration

Production Runs

Run number Angle (degree) Momentum (GeV)
809 - 924 17 2.0
932 - 949 22 1.805


Meetings


How-to Documentation

Links

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