Apr 10, 2012 Calorimetry

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Teleconference Time: 11:00 a.m. EST'

  • ESNET (Number is 8542553) and EVO 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 757-269-6337 (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. Cables
    • Review cable labels for Fcal (Matt) and for Bcal (Zisis)

Tentative Agenda

  1. Announcements
  2. Review of Action Items
  3. Monitoring
  4. Cable Labels
  5. FCAL
    1. Construction Status
    2. 2011 Hall B FCAL Beam Test (John)
  6. BCAL
    1. BCAL Beam Tests 2012
    2. BCAL beam test: fadc amplitudes upstream end
    3. BCAL beam test: downstream end
  7. USM update
    1. File:USMUpdateJaviera20120410.pdf (Javiera)
    2. File:USMUpdateOrlando20120410.pdf (Orlando)
    3. File:USMUpdateHayk20120410.pdf (Hayk)
  8. TDR update
    1. Instructions for the TDR (You must be logged into the wiki to access this page).
    2. We need to start revising Chapter 4 Detector, Section 4.3 Calorimetry.
    3. Calibration of Calorimeters
  9. Simulations/Reconstruction
  10. Any other business


Attending: David, Sasha, Tim, Beni, John D., Yi, John L., Hovanes, Eugene, Elton (JLab); Matt (IU); Christina, Pavlos, George (Athens); Orlando, Javiera, Will, Hayk, Serguei, Iñaki (USM).

  1. Announcements
  2. Review of Action Items
  3. Monitoring (Athens)
    1. Order of new control boards has not yet gone out due to Easter holiday.
    2. JLab will also order components and additional control boards
    3. Need to find out about shipping SiPMs to Regina for eventual delivery to Athens.
  4. Cable Labels
  5. Cable labeling is under discussion for the Fcal. Fernando plans to have all ends, including readout electronic slot/channel labels. Matt supports this decision.
  6. Discussion regarding complete labeling to provide flexibility at final connections.
  7. This need to be completed for Bcal also.
  8. FCAL
    1. Construction Status
      • Samples of conformal coating from third party company not yet provided
      • Coating from company have been received and need additional touch up, which will be done at IU
      • Eugene: Asked about range on Flash. This should be decided with assistance from beam data.
    2. 2011 Hall B FCAL Beam Test (John)
      • Accelerator is at 0.879 GeV/pass, 3-pass to Hall B. On Friday they plan to move to 5-pass on Friday. Following Wednesday the accelerator will return to 1.16 GeV/pass
      • Fcal plans to stay in the alcove to take data at all energies.
      • Also need to change FADC readout mode to sparcification and move away from raw data mode
  9. BCAL
    1. BCAL Beam Tests 2012
      • mini-Bcal moved to EEL about 10 days ago, cabled up and took about two days of cosmic-ray data
      • Prototype moved down to Hall B last Tuesday.
      • Hooked up to DAQ and took some data over the weekend (see example below)
      • The cooling circuit had a blockage, but this was fixed yesterday. Temperatures are stable at chiller T= 14 deg C, upstream T=17.5 deg C, downstream T=14.5 C
      • Accelerator is in the process of restoring beam at 3 pass. Will resume data taking when beam is stable.
      • BCAL beam test: fadc amplitudes upstream end
      • BCAL beam test: downstream end
  10. USM update
    1. File:USMUpdateJaviera20120410.pdf (Javiera)
      • Production is ramping up and USM should be able to test at almost twice original production rate
      • Already have more than 500 tested units. Plan to ship in about a week after all data has been digested.
    2. File:USMUpdateHayk20120410.pdf (Hayk)
      • Summary of parameters measured at 3 temperatures in station 3 for V = Vbr +0.9 V.
      • Differences consistent with differences in temperature. Minor irregularities exist and these will be studied before shipping tested units.
      • Corrections performed to the nominal 5, 7 and 20 degrees. Small corrections need to be made to correct to actual temperatures measured at the location of the sensor.
      • The dark rate seems to be the most problematic, especially noted are systematics for IDs < 1700
      • Dark rate determined from the ratio of total events to number of events in pedestal.
      • Dark rates could not be reliably determined in dark conditions at Vbr+0.9V. They were determined by measuring at higher voltages and extrapolated to +0.9V.
    3. File:USMUpdateOrlando20120410.pdf (Orlando)
      • Temperatures are measured at sixteen locations in stage 3 box (between each pair of sensors)
      • Data showed the time evolution of temperatures during cooldown and also variation of each temperature sensor at the beginning, middle and end of data taking.
      • Variations in temperature are very small and stability is very good.
    4. Light Guides (Iñaki)
      • The large milling machine is back operational.
      • Starting today, they will begin machining 24 "A" guides per day
  11. TDR update
    1. No updates
  12. Simulations/Reconstruction
    1. No updates
  13. Any other business