June 18, 2022

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RC Meeting Information

RC Daily Meetings are at 11:00 (am) via Zoom and in person in the counting house meeting room (2nd floor)

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Useful Links

Current Status

  • Jun 17 - Swing (yesterday)
    • pionLT optics checkout completed (Jacob verified 200 counts / hole / foil)
  • Jun 18 - Owl (today)
    • coincidence trigger checkout was completed during late Jun 17 Swing / Early Owl shift --> https://logbooks.jlab.org/entry/4004019
      • During early Owl, shift crew noticed pTRIG5 (coin. trigger HMS EL-REAL + SHMS 3/4) was missing. This was determined by Brad to be a faulty delay module and module was replaced --> https://logbooks.jlab.org/entry/4004101
      • There was also a report of an issue with TDC errors in the replay, but these were found to be an insignificant fraction, and most likely due to a noise burst which caused the TDCs to reject hits due to exceeding its buffer --> https://logbooks.jlab.org/entry/4004102
  • Jun 18 - Day (today)
    • H(e,e'p) coincidence, which needed ~10,000 counts, but decided to stop earlier to take dummy data. As of 6 am they had ~5400 events.
      • Jacob noticed a discrepancy between estimates and reality in the SHMS singles and coincidence rates for H(e,e'p) --> https://logbooks.jlab.org/entry/4004139 . But this discrepancy seems to have been attributed to a too tight missing mass cut, as D. Gaskell explained to me.

Current Run Plan

pionLT Summer 2022 Run Plan

  • Do single Heep coin setting (p. 8) ( DONE )

Begin production physics @ 10.549 GeV beam energy: 

Setting #1: Q2=3.85, W=2.02, x=0.55, high epsilon | HMS angle = 13.31 deg, HMS P = -6.792 GeV/c,  SHMS P = +3.493 GeV/c
  • LH2 SHMS Right | SHMS Angle = 19.65 deg (p. 9-11) | goal 81,000 | total counts: 85,472 | ( DONE )
  • LH2 SHMS Center | SHMS Angle = 21.65 deg ( p.12 ) | goal 81,000 | total counts: ?? | ( IN-PROGRESS )
  • LH2 SHMS Left | SHMS Angle = 23.65 deg ( p.13 ) | goal 81,000 | total counts: ?? | ( PENDING )
Setting #2: Q2=2.73, W=2.63, x=0.31, high epsilon | HMS angle = 12.04 deg, HMS P = -5.878 GeV/c,  SHMS P = +4.605 GeV/c
  • LH2 SHMS Left | SHMS Angle = 16.33 deg (p. 14-15) | goal 145,000 | total counts: ?? | ( PENDING )
  • LH2 SHMS Center | SHMS Angle = 14.33 deg ( p.16 ) | goal 145,000 | total counts: ?? | ( PENDING )
  • LH2 SHMS Right | SHMS Angle = 12.33 deg ( p.17 ) | goal 145,000 | total counts: ?? | ( PENDING )
Setting #3: Q2=3.85, W=2.62, x=0.39, high epsilon | HMS angle = 15.06 deg, HMS P = -5.309 GeV/c,  SHMS P = +5.127 GeV/c
  • LH2 SHMS Right | SHMS Angle = 12.28 deg (p.18-19 ) | goal 61,000 | total counts: ?? | ( PENDING )
  • LD2 SHMS Right | SHMS Angle = 12.28 deg ( p.20 ) | goal 61,000 | total counts: ?? | ( PENDING )
  • LD2 SHMS Center | SHMS Angle = 14.28 deg ( p.21-22 ) | goal 61,000 | total counts: ?? | ( PENDING )
  • LH2 SHMS Center | SHMS Angle = 14.28 deg (p.23 ) | goal 61,000 | total counts: ?? | ( PENDING ) -> NO DUMMY RUN??
  • LH2 SHMS Left | SHMS Angle = 16.28 deg (p.24 ) | goal 61,000 | total counts: ?? | ( PENDING )
  • LD2 SHMS Left | SHMS Angle = 16.28 deg (p.25 ) | goal 61,000 | total counts: ?? | ( PENDING )
Setting #4: Q2=6.00, W=2.40, x=0.55, high epsilon | HMS angle = 19.92 deg, HMS P = -4.752 GeV/c,  SHMS P = +5.512 GeV/c
  • LD2 SHMS Left | SHMS Angle = 16.91 deg (p.26-27 ) | goal 30,000 | total counts: ?? | ( PENDING )
  • LH2 SHMS Left | SHMS Angle = 16.91 deg (p.28 ) | goal 30,000 | total counts: ?? | ( PENDING )

Notices in Effect for Shift Crew

  • Please pro-rate ABU for max current limit in run plan (uA) in beam time accounting. For example, if we receive 15 uA instead of the max_current_limit in the run plan, then the ABU should be: ABU_prorated = 15/(max current limit) * ABU
  • Message from Ole Hansen: There will be a brief (<30min) outage of the Hall A and Hall C /work servers on Tuesday (6/21). This will happen during the workday already instead of the usual 5pm-10pm time slot for monthly IT maintenance. Please plan accordingly, i.e. don't start any mass replays ;-)
  • Check the HMS/SHMS rates for when production starts, since for Heep coin. production SHMS saw higher rates. Make sure shift crew takes snapshot of scalers at every setting

Current Issues

Planned Accesses to the Hall

  • During the next accelerator maintenance period (Wed Jun 22):
    • S. Lassiter needs to put crush washers in LCW filters, so we may see a little bit of water by the HMS boogie for now, until he can put the washers next week, during maintenance period HMS Dipole LCW ( PENDING )
    • Hall C Expert needs to check SHMS ROC 4 Slot 9 Channel 0 FADC for potentially loose connection, as Column 5, Row 1 block appears to have no occupancy. SHMS Cal Occupancy ( PENDING )
    • Xinzhan Bai request to go to restricted access to quickly swap MPD electronics out and check signals (~ 30 min.), whenever there is extended down (most likely during next accelerator maintenance period) : Contact: xbai@jlab.org, cell: (434) 422-2809 ( PENDING )
    • Hall C Expert should check HMS ROC 3 (in HMS Hut) pertaining to this log-entry: ROC 3 TDC FIFO Error ( PENDING )

Planned Accelerator Configuration Changes

Special Requests

  • Mark Jones would like to take HMS optics data with a 4x4 mm^2 raster at some point (when HMS is at a lower momentum, i.e., current setting) for checks. ( DONE )
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