Difference between revisions of "Sep 20, 2018 Calorimeter"

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# Announcements
 
# Announcements
 +
#* Accelerator is coming back online. Vacuum leak and obstruction seems to have been fixed. Expect beam as early as Friday.
 
# Action Items
 
# Action Items
 +
#* FCAL MC changes: Sean expects non-linearities to possibly change. Has generated a new MC sample and it should be looked at. Sean will send the links/info to Matt.
 +
#* BCAL LED runs: Ahmed has started looking at the runs and sees only downstream LED working. Will confirm and will give feedback to Elton and Mark.
 +
#* Matt added an action item.
 
# [[GlueX-Collaboration-Sep-2018]]
 
# [[GlueX-Collaboration-Sep-2018]]
 
# Run Updates
 
# Run Updates
 
## FCAL
 
## FCAL
 +
##* PMTs are on and ready. Replaced eight bases, all dead ones. Still some dropping HV at the outer edge, but will continue to monitor. Presently spares are limited to a couple.
 
## BCAL
 
## BCAL
 +
##* Upstream chiller now seems to be operating at a reasonable level. See [https://logbooks.jlab.org/entry/3594999 Log Entry 3594999] although pressures are still higher than downstream chiller.
 +
##* Glitch in operation of BCAL and FCAL temperature feedback loops concerned Fernando and HCO was downgraded to 'not ready'. Mark has restarted the feedback script and that seems to have fixed the problem. [After lunch, Fernando requested that the feedback keep fans below 5000 rpm].
 +
##* Ahmed has been cleaning up occupancy plots and preparing a presentation with annotations for discussion. Zisis is traveling to JLab for shifts and the collaboration meeting.
 
# Calibrations
 
# Calibrations
 
## [https://logbooks.jlab.org/entry/3595747 FCAL Pedestals and LED Rate] (Matt)
 
## [https://logbooks.jlab.org/entry/3595747 FCAL Pedestals and LED Rate] (Matt)
 +
##* FCAL monitoring of spring 2018 data showed the pi0 mass shift for some runs. The runs ( around ~42221) were found to correspond to an (accidentally) high pulsing of the LEDs, up to 1kHz where 10 Hz is nominal.
 +
##* The causality of pi0 mass shift due to pedestals is not established.
 +
##* Colin, Mark and Elton will take a look at pulses on the scope and see how the baseline shifts. Note added: No baseline shifts were found, but at high rates LED pulser rates it was noted that the HV on some pmts was sagging. See [https://logbooks.jlab.org/entry/3595928 Log Entry 3595928].
 
## [https://logbooks.jlab.org/entry/3595753 FCAL Radiation Damage] (Jared)
 
## [https://logbooks.jlab.org/entry/3595753 FCAL Radiation Damage] (Jared)
 
## [https://halldweb.jlab.org/DocDB/0037/003746/001/presentation.pdf pi0 gun for gain calibration] (Colin)
 
## [https://halldweb.jlab.org/DocDB/0037/003746/001/presentation.pdf pi0 gun for gain calibration] (Colin)

Revision as of 17:51, 20 September 2018

Meeting Time: 11:00 a.m.

  1. To join via a Web Browser, go to the page [1] https://bluejeans.com/907185247.
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  5. More information on connecting to bluejeans is available.

Participant Direct Lines

  • JLab Phone in CC L207 is 757-269-7084 (usual room)
  • JLab Phone: in CC F326 is 757-269-6460
  • Phone in the Regina Video-conference Suite is 306-585-4204
  • Athens Phone: in Christina's office is 011-30-210-727-6947

Action Items

  1. BCAL and FCAL: Develop standard fiducial volume cuts for the calorimeters
  2. FCAL: Cross check MC changes by Richard to make sure that gains are not affected in both Geant3 and Geant4 (Matt/IHEP)
  3. BCAL: Interchange LED trigger cables and see if upstream and downstream features change (Elton and Mark) See Log Entries 3593920 and reference.

Complete after new launch

  1. From Mike's work: -cos(phi) type dependence in the data and a phi dependence at the downstream end of the bcal. See Sep 21, 2017 Calorimeter Meeting.

References

  1. FCAL HDFCAL log book
  2. BCAL HDBCAL log book

Tentative Agenda

  1. Announcements
  2. Action Items
  3. GlueX-Collaboration-Sep-2018
  4. Run Updates
    1. FCAL
    2. BCAL
  5. Calibrations
    1. FCAL Pedestals and LED Rate (Matt)
    2. FCAL Radiation Damage (Jared)
    3. pi0 gun for gain calibration (Colin)
  6. Reconstruction and Simulation
    1. Pi0 Calibration DocDB page Update with Layer 4 Cosmics corrections (Tegan)
  7. NIM articles
  8. Any other business

Minutes

Attending: Elton, Mark, Colin, George V., Christina (JLab); Will (CMU); Jon, Matt, Jared (IU); Tegan, Colleen, Zisis, Ahmed (UofR); Sean (FSU); Rupesh (FIU).

  1. Announcements
    • Accelerator is coming back online. Vacuum leak and obstruction seems to have been fixed. Expect beam as early as Friday.
  2. Action Items
    • FCAL MC changes: Sean expects non-linearities to possibly change. Has generated a new MC sample and it should be looked at. Sean will send the links/info to Matt.
    • BCAL LED runs: Ahmed has started looking at the runs and sees only downstream LED working. Will confirm and will give feedback to Elton and Mark.
    • Matt added an action item.
  3. GlueX-Collaboration-Sep-2018
  4. Run Updates
    1. FCAL
      • PMTs are on and ready. Replaced eight bases, all dead ones. Still some dropping HV at the outer edge, but will continue to monitor. Presently spares are limited to a couple.
    2. BCAL
      • Upstream chiller now seems to be operating at a reasonable level. See Log Entry 3594999 although pressures are still higher than downstream chiller.
      • Glitch in operation of BCAL and FCAL temperature feedback loops concerned Fernando and HCO was downgraded to 'not ready'. Mark has restarted the feedback script and that seems to have fixed the problem. [After lunch, Fernando requested that the feedback keep fans below 5000 rpm].
      • Ahmed has been cleaning up occupancy plots and preparing a presentation with annotations for discussion. Zisis is traveling to JLab for shifts and the collaboration meeting.
  5. Calibrations
    1. FCAL Pedestals and LED Rate (Matt)
      • FCAL monitoring of spring 2018 data showed the pi0 mass shift for some runs. The runs ( around ~42221) were found to correspond to an (accidentally) high pulsing of the LEDs, up to 1kHz where 10 Hz is nominal.
      • The causality of pi0 mass shift due to pedestals is not established.
      • Colin, Mark and Elton will take a look at pulses on the scope and see how the baseline shifts. Note added: No baseline shifts were found, but at high rates LED pulser rates it was noted that the HV on some pmts was sagging. See Log Entry 3595928.
    2. FCAL Radiation Damage (Jared)
    3. pi0 gun for gain calibration (Colin)
  6. Reconstruction and Simulation
    1. Pi0 Calibration DocDB page Update with Layer 4 Cosmics corrections (Tegan)
  7. NIM articles
  8. Any other business
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