Difference between revisions of "Jan 30, 2014 Calorimetry"

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(Minutes)
(Minutes)
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##* Chiller trips (or is off) or temperature on plates exceeds some threshold -> turn HV and LV power off to MPPCs. Note: Probably it is only necessary to turn off the LV, but both are in the same crate, and I prefer turning them both off
 
##* Chiller trips (or is off) or temperature on plates exceeds some threshold -> turn HV and LV power off to MPPCs. Note: Probably it is only necessary to turn off the LV, but both are in the same crate, and I prefer turning them both off
 
##* We need to investigate the capabilities of the chiller to implement this and find a cable to connect to the MPOD crate
 
##* We need to investigate the capabilities of the chiller to implement this and find a cable to connect to the MPOD crate
## For each side of the BCAL: Compute the dew point from temperature and humidity measured in the 4 sensors. Turn LV and HV off if temperature on cooling plate is close to dew point (e.g. less than 5 deg).
+
## For each side of the BCAL: Compute the dew point from temperature and humidity measured in the 4 sensors. Shut off chiller if temperature on cooling plate is close to dew point (e.g. less than 5 deg).
##* Note: under this condition, one should shut off the chiller and perhaps keep the power on.
+
 
##* This calculation would be done in the PLC and the signal sent to the MPOD crate ORed with the signal from the chiller. This probably means it makes sense to send the chiller signals into the PLC and create an output that would shutdown the crate if either condition is satisfied.
 
##* This calculation would be done in the PLC and the signal sent to the MPOD crate ORed with the signal from the chiller. This probably means it makes sense to send the chiller signals into the PLC and create an output that would shutdown the crate if either condition is satisfied.
 
## Note that shutdown can be relatively slow, as the time scale for environmental changes is ~ minutes.
 
## Note that shutdown can be relatively slow, as the time scale for environmental changes is ~ minutes.

Revision as of 13:32, 30 January 2014

Teleconference Time: 11:00 a.m. EST

  • ESNET (Number is 8542553) and SeeVogh session (GlueX Calorimetry meeting room)
  • Phone connection only upon request.
    • +1-866-740-1260 : US+Canada
    • +1-303-248-0285 : International
    • then enter participant code: 3421244# (remember the "#").
    • or www.readytalk.com (and code without the #)

Participant Direct Lines

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

Items for followup from previous meeting(s)

  1. Provide short summary of constants and their use in determination of the sampling fraction (David)
  2. Provide feedback to Configuration Management document for FCAL and BCAL (Zisis and Matt/John)

Tentative Agenda

  1. Announcements
  2. Action Items
  3. Monitoring
  4. FCAL
    1. (From John, who is snowed in) For the fcal, we ran both 6 crate daqs (north and south) and adjusted the dac settings so that all the pedestals are 100. We are continuing to write to get ready to turn the detector on.
  5. BCAL
  6. BCAL Interlocks see e-mail Elton)
    1. Need to provide input to Dave Butler as he implements the PLC logic and interlock systems for each detector.
    2. Chiller trips (or is off) -> turn HV and LV power off to MPPCs. Note: Probably it is only necessary to turn off the LV, but both are in the same crate, and I prefer turning them both off
      • We need to investigate the capabilities of the chiller to implement this and find a cable to connect to the MPOD crate
    3. For each side of the BCAL: Compute the dew point from temperature and humidity measured in the 4 sensors. Turn LV and HV off if temperature on cooling plate is close to dew point (e.g. less than 5 deg).
      • This calculation would be done in the PLC and the signal sent to the MPOD crate ORed with the signal from the chiller. This probably means it makes sense to send the chiller signals into the PLC and create an output that would shutdown the crate if either condition is satisfied.
    4. Note that shutdown can be relatively slow, as the time scale for environmental changes is ~ minutes.
    5. Note from Fernando: Insure that + and - 5 V power inputs to the BCAL readout is balanced. In particular, if one polarity is lost, the other should be turned off also. This will probably be implemented in EPICs.
  7. Reconstruction and Simulation
  8. TDR update
  9. Calibration
  10. Any other business

Minutes

Attendees: Fernando, Yi, David, Elton, Mark, Sasha, Eugene, Beni, Orlando (JLab); Shawn, Zisis, Andrei (UofR); Christina (Athens)

  1. Announcements
  2. Action Items
  3. Monitoring
  4. FCAL
    1. (From John, who is snowed in) For the fcal, we ran both 6 crate daqs (north and south) and adjusted the dac settings so that all the pedestals are 100. We are continuing to write to get ready to turn the detector on.
    2. Sasha: Data taken to determine ADC pedestals with the goal to align the pedestals at channel=100. The measured widths are about 1.3 counts.
      • Automatic procedure to input the pedestals and generate new configuration files with adjusted thresholds.
      • The pedestals and thresholds will eventually be included into the Run Configuration Data Base (not implemented yet)
      • There are two thresholds: trigger and readout (sparcification). Optimum setting is yet to be determined, but about 5 counts above pedestal.
  5. BCAL
    1. Sasha: BCAL DAQ crates are powered now. Only two controllers are available, possibly 2 more from Dave Abbott. Initially controllers will be placed in one Flash crate and in one TDC crate.
    2. Mark: Remainder of crate controllers are scheduled to be delivered in mid Feb.
    3. Zisis: Would like to pursue plan to place external scintillation counters above and below the magnet. There should be room between the top platform and the magnet. Inventory of paddles at Regina and CMU will be checked.
    4. Mark: Qweak has several 200x30cm2 scintillators that might be available temporarily. Zisis was going to check.
  6. BCAL Interlocks see e-mail Elton)
    1. Need to provide input to Dave Butler as he implements the PLC logic and interlock systems for each detector.
      • Chiller trips (or is off) or temperature on plates exceeds some threshold -> turn HV and LV power off to MPPCs. Note: Probably it is only necessary to turn off the LV, but both are in the same crate, and I prefer turning them both off
      • We need to investigate the capabilities of the chiller to implement this and find a cable to connect to the MPOD crate
    2. For each side of the BCAL: Compute the dew point from temperature and humidity measured in the 4 sensors. Shut off chiller if temperature on cooling plate is close to dew point (e.g. less than 5 deg).
      • This calculation would be done in the PLC and the signal sent to the MPOD crate ORed with the signal from the chiller. This probably means it makes sense to send the chiller signals into the PLC and create an output that would shutdown the crate if either condition is satisfied.
    3. Note that shutdown can be relatively slow, as the time scale for environmental changes is ~ minutes.
    4. Note from Fernando: Insure that + and - 5 V power inputs to the BCAL readout is balanced. In particular, if one polarity is lost, the other should be turned off also. This will probably be implemented in EPICs.
  7. Reconstruction and Simulation
  8. TDR update
  9. Calibration
  10. Any other business