Nov 5, 2013 Calorimetry

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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 (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. Revisit raw data format for Flash-250 MHz following Flash-125 MHz discussion. (all)

Tentative Agenda

  1. Announcements
  2. Action Items
  3. Monitoring
  4. FCAL
  5. BCAL
  6. Reconstruction and Simulation
  7. TDR update
  8. Calibration of Calorimeters
    1. BCAL Calibration GlueX-doc-2361
    2. Pi0 and Eta Statistics GlueX-doc-1702
  9. Any other business


Attendees: Elton, Dave, Beni, Yi, Alam (JLab); Will (CMU); Sean (NW); Matt (IU); Zisis, Andrei, Giovanni (UofR).

  1. Announcements
  2. Action Items
  3. Monitoring NIM paper
    • Responding to referee comments
    • Feedback incorporated from authors
    • Uploaded"final" manuscript to DocDB
    • Comments welcome, will return submission at the end of the week
  4. FCAL
    • John is keeping progress going
    • Trial fit of plexiglass panes last week
    • Getting ready for when power is available (likely next week)
    • Interlock system. Hand-made circuits with perforated boards did not meet Fernando's standards. He will replace them with printed circuit boards to improve safety and ease of maintenance.
    • JLab contract (now closed) with IU is being audited and procurement has requested some backup information. Matt is waiting for Fitri Lamm from IU research services will return from vacation.
  5. BCAL
    • Cabling is mostly complete. Missing are still connections to crates that are not installed because they are waiting for the power to be install in the racks.
    • The distribution panels (4x2 for the bias and 4x2 for the pulsing system) are not yet ready. The bias distribution is about half built. Alam designed the distribution boards for the pulsing system. The parts are in and need to be put together. Both of these should be completed over the next few weeks and ready about the time the power is available to the racks.
    • Elton: Notes that Orlando Soto (from USM) is being invited to JLab, has his visa, but due to budget woes, travel arrangements should be made soon. We are trying to push the paperwork through now.
    • Shaun has progressed in the cosmics analysis and is looking at timing information to calculate the muon angles and thus tighten the energy depositions. No time-walk effect appears to be visible - subsequently, Shaun saw that there is a mild dependence on the up-down time.
  6. Reconstruction and Simulation
    • Andrei and Irina simulated the shower curvature effect as a function of energy and angle (see more below).
  7. TDR update
    • Zisis will update the calibration section by January to meet Mike's tentative deadline of the February Collaboration Meeting.
  8. Calibration of Calorimeters
    1. BCAL Calibration GlueX-doc-2361
      • Preliminary discussion of bringing the detector online
      • Elton: Data from summed outputs need to keep track of which bias are on, which can provide information on individual MPPCs.
      • Cosmics will be very useful, although the use for calibration has not been worked out.
      • Question: Should we add external counters (above/below) solenoid. How to interface to DAQ. Elton: CMU is planning on bringing a large counter, which could be shared. There is good access below the solenoid, which could select muons that penetrate through the iron. He will investigate how much room is available above the solenoid.
      • How will these data be incorporated into (and which) data bases? Sean: A new calibration meeting (Weds instead of the tracking meeting) will be started to go over calibrations.
      • Sean: What calibration parameters are needed and how does the reconstruction use them? Elton suggested that Will send around formulas currently used in the code to start discussions. (It is unclear the origin of these reconstruction formulas - subsequently, Will L. found their origin in work that Matt and Mihajlo had done in 2008, GlueX-doc-989).
      • Lookup tables: There are also constants used in the sampling fraction that uses lookup tables. Same is true for the curvature effect that is being understood.
    2. Pi0 and Eta Statistics GlueX-doc-1702
      • Elton quickly went over slides giving rates of pi0 and etas (from BGGEN) in the Fcal and Bcal. 17million pi0s per 10 hours and 3 million etas per 10 hours. In the Bcal the photons are mostly at forward angles.
  9. Any other business