RC meeting and Run Plan, Friday December 2nd

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RC Meeting Information

Time: Daily at 3:30pm

• Location: Counting house conference room

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Shift Schedule

https://misportal.jlab.org/mis/physics/shiftSchedule/?experimentRunId=SBS-GEn-2022

Current Status

• Production run on Pol-He3 @ 30 uA beam current
• NMR polarization is rough at the moment, correct calibration is underway by the target experts
• Gordon informed that we can go up to 30 uA beam, previously we were using 20 uA (last swing @ 6:30 PM)
• Last swing shift crew had DAQ issue with intelsbsgem3:ROC22 , see a log entry [ https://logbooks.jlab.org/entry/4093745 ], and also the timing difference between 3Stream config and noSBSGEMs config seems still there, [ https://logbooks.jlab.org/entry/4093739 ], combining these two issues we may need DAQ experts to do a further check

• Hunter finished EPR mesurement
• Jiwan did a scaler rate scan by stepping up beam current every 5 uA [ https://logbooks.jlab.org/entry/4094268 ]
• Hall C requested an controlled access to Hall A for taking out a spare Vacuum [ https://logbooks.jlab.org/entry/4094276 ]

Short Term Run Plan

• Continue production run on He3 target, 30 uA
• Use GEnII-3stream DAQ config
• Use ps3=0, ps5=6, others =-1
• BBCal threshold at -366 mV, HCal threshold at -19 mV
• NMR measurement every 2 hours

Target Training

• We have students want to have Target Training, maybe arrange a training session?

Current Issues

• BB Hodoscope: channel 0R - 15R missing in the 50K replay [ https://logbooks.jlab.org/files/2022/12/4093673/summaryPlots_2966_BBTH.pdf ]
• The Timing difference between -3stream config and noSBSGEMs config seems not fixed, need to be further investigated
• Trigger rate for 30 uA @ Pol-He3 target is around 220 Hz, it seems a bit low to me, I checked the BBCal threshold -366 mV which is consistent with what we used before for production

Planned Accesses to the Hall

• A further evaluation is underway to see if an access is needed to fix the hodoscope

Special Requests

• None

Notices in Effect for Shift Crew

• Power down SBS, BB, and Detector HV before making an access to the Hall