RC Meeting Information

RC Daily Meetings are at 3:15pm, remote connection link: https://bluejeans.com/256205934

Accelerator Status

In Restricted Access for Jessie's team to work
Shifts cancelled through weekend
Counting house unmanned
Focused review on Friday
See Jack's logentry for description on Big Bite incident https://logbooks.jlab.org/entry/3932961
All detectors HV are off and need to remain off for the immediate future

HCAL: Continued to work on LED pulser, TDC hopefully fixed, but no way to know until the detector can be turned back on (which is as of yet still out of the question);
BBCal: Amplitude of PS varies with SBS field; need to look if there is e.g. a left/right dependency to confirm this is indeed due to SBS field; if confirmed, need to come with a plan to improve the PMT shielding; Also coming with a plan to install dry air flow on PMTs for BB+Hodoscope;
Timing Hodoscope: Optimization of timing cuts and investigating bar-by-bar efficiency; also looking at optimization of timing cuts;
Grinch: Need pulser data to adjust time window in order to find the pulser signal; CO2 being cycled in the tank;
GEMS: detector switched off https://logbooks.jlab.org/entry/3932944 ans switched to nitrogen; when allowed to switch back on: visual and mechanical inspection of the detectors before switching the detecots back on, then ramp HV on gradually.
DAQ: update of TI firmware to diagnose trigger acceptance issues;
Replay Analysis: Updating GEM alignment: 2 parametrizations, 1 after BB move, 1 after some manual work on the GEMs; SBS4 optics data to analyzer; Need to fine tune GEM analysis for higher luminosities; LHRS Scalers are succesfully decoded, but they don't make it to the output tree yet.

Check GEM gas mix every 2 hours
HALOG GEM efficiency plots e.g. (https://logbooks.jlab.org/entry/3930258)
Fill Out Run list
New Quick Beam checkout procedure (Target at home, Harps SCAN, check BPM strip chart) No C Hole after initial checkout completed at each configuration
Ramp BB magnet to 0 before "power off". Here is a nice entry by Jack here

Can't identify pulsar events in HCal (Ole, Alex)
Need script/method to determine # good events
Need script to get accumulated charge
Waiting for response from OPS about when "long" ramping procedure required on SBS quick ramp vs [ https://logbooks.jlab.org/entry/3931987 long procedure]
Rates in Hodoscope at ("300 kHz/1 uA on LD2 signals, 10 mV threshold, 40 mV signal on "FADC", "good" signal based on GeM tracks" D.Hamilton) Would like to do a HV scan on timing hodoscope (Ralph)