Difference between revisions of "XEM: Notable Events and Changes"

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=== October 19, 2022 ===
 +
* BCM 3H05 (Unser girder) temperature out of control (https://logbooks.jlab.org/entry/4063487)
 +
** Temperature controller was replaced - no data taken with bad temperature I think
 +
** Later, observed occasional temperature excursions up to 113. Not sure if this is a problem.
 +
*** Shuji discovered this is completely correlated with target motion!
 +
 +
=== October 14-15, 2022 ===
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* HMS DAQ rebuilt
 +
** DAQ went down hard - Bob had to rebuild
 +
** A couple log entries https://logbooks.jlab.org/entry/4059000, https://logbooks.jlab.org/entry/4059166
 +
 +
=== October 15, 2022 ===
 +
* SHMS trigger changes
 +
** ELLO = 3/4 AND Cherenkov (was 3/4 AND Cherenkov AND PRLO)
 +
** ELHI = 3/4 AND PRLO (was 3/4 AND PRHI)
 +
 
=== October 10, 2022 ===
 
=== October 10, 2022 ===
 
* SHMS 2Y- scalers restored during the middle of SHMS run 17336 - those scalers were missing for all runs before this
 
* 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===
 
=== October 9, 2022===
−
* SHMS PID thresholds set:
+
* SHMS PID thresholds set - just before SHMS run 17318 (https://logbooks.jlab.org/entry/4053299):
−
**NGC: -12.7 mV
+
** NGC: -12.7 mV
−
**PRLO: -35.4 mV
+
** PRLO: -35.4 mV
−
**PRHI: -44.2 mV
+
** PRHI: -44.2 mV
 +
 
 +
=== October 8, 2022===
 +
* SHMS NGC PMT1 HV changed back to 1700 V
 +
 
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=== October 7, 2022===
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* Moved SHMS sPre14- HV cable to new channel. No impact on data. (https://logbooks.jlab.org/entry/4052039)
 +
* Sent HMS edtm pulse through discriminator to give constant with (50 ns) for all frequencies (https://logbooks.jlab.org/entry/4051873)
 +
 
 +
=== 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
 +
 
 +
=== October 4 (day)-9 (swing), 2022 ===
 +
* No beam due to magnets connected to RSEP8 power supply - magnets were overheating due to inadequate LCW flow
 +
 
 +
=== October 4, 2022 ===
 +
* SHMS/HMS threshold adjustments (https://logbooks.jlab.org/entry/4050809, https://logbooks.jlab.org/entry/4050908)
 +
** HMS
 +
*** HGCER: Changed from -9.8 mV to -14.7 mV
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*** No changes to PRLO, PRHI, or SHLO
 +
** SHMS
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*** No changes to PRLO, PRHI at this time (changed later)
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** Set NGCER to -15.2 mV
 +
* Reverted SHMS NGV PMT1 HV change (changed back from 1700 to 1835) - this was done after 17259 (https://logbooks.jlab.org/entry/4051044)
 +
 
 +
=== October 3, 2022 ===
 +
* SHMS NGC PMT1, HV changed from 1835 V to 1700 V (https://logbooks.jlab.org/entry/4050329)
 +
** SHMS Run 17238 has this new HV

Latest revision as of 11:58, 22 October 2022

October 19, 2022

  • BCM 3H05 (Unser girder) temperature out of control (https://logbooks.jlab.org/entry/4063487)
    • Temperature controller was replaced - no data taken with bad temperature I think
    • Later, observed occasional temperature excursions up to 113. Not sure if this is a problem.
      • Shuji discovered this is completely correlated with target motion!

October 14-15, 2022

October 15, 2022

  • SHMS trigger changes
    • ELLO = 3/4 AND Cherenkov (was 3/4 AND Cherenkov AND PRLO)
    • ELHI = 3/4 AND PRLO (was 3/4 AND PRHI)

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

October 8, 2022

  • SHMS NGC PMT1 HV changed back to 1700 V

October 7, 2022

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

October 4 (day)-9 (swing), 2022

  • No beam due to magnets connected to RSEP8 power supply - magnets were overheating due to inadequate LCW flow

October 4, 2022

October 3, 2022

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