XEM: Notable Events and Changes

October 10, 2022

• SHMS 2Y- scalers restored during the middle of SHMS run 17336 - those scalers were missing for all runs before this
• Noticed spurious signal in SHMS 2Y21- - it turned out to be RF signal plugged into FADC, and map fiule wasn't updated. Commented this out in the map file - does not impact data. Could impact (maybe?) data analyzed before map file change

October 9, 2022

• SHMS PID thresholds set - just before SHMS run 17318:
  • NGC: -12.7 mV
  • PRLO: -35.4 mV
  • PRHI: -44.2 mV

October 8, 2022

• SHMS NGC PMT1 HV changed back to 1700 V

October 6, 2022

• SHMS PRLO and PRHI thresholds increased to -45.4 and -50.9 mV to get rid of huge "no beam rate."
  • These thresholds were used for most of SHMS paddle study - affects runs starting with 17261
• Mark updated the trigger mapping for SHMS DAQ (see elog https://logbooks.jlab.org/entry/4051681)
  • Would only have impacted data taken with elclean trigger - we had not taken any to this point, so not an issue