Jan 21, 2010 Calorimetry

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Teleconference Time: 11:00 a.m. EST

  • ESNET and EVO session
  • Phone only if requested:
    • +1-800-377-8846 : US
    • +1-888-276-7715 : Canada
    • +1-302-709-8424 : International
    • then enter participant code: 77438230# (remember the "#"). Phone line by request only.

Items for followup from previous meeting(s)

  1. Fcal
    • Specify the number of Rad Hard blocks to writeup a change request to the project.
    • Check that darkroom is in installation budget (Elton). Activity number 1562465
  2. Bcal
    • Run MC to investigate changes in resolution due to different fiber attenuation length and light output. - Completed, will be reported at Jan 28-30 Collaboration Meeting.
  3. Bcal readout -- on ice since the chosen technology will be SiPMs.
    • USM will investigate options for producing prototypes in Chile.
    • Jlab to send latest geometrical model of light guides to USM for reference.

Documents to Review

Tentative Agenda

  1. Announcements
  2. Review of Action Items
  3. Calibration/Monitoring Media:lucite_athens.ppt
  4. FCAL
  5. BCAL
    • Construction Status
    • Fibre tests
  6. BCAL Readout
  7. Simulations
  8. Organization of Calorimetry Session for the Jan 28-30 Collaboration Meeting
    • Calibration Presentation
    • FCAL talk(s)
    • BCAL talk(s)
    • Readout talk(s)
  9. Other business


Attendees: Eugene, Carl, Fernando, Beni, Lubomir, Pedro (JLab), Will (USM), Matt, Claire, Brad, Ryan, Mihajlo (IU), George, Andrei, Zisis (Regina)

  1. Announcements: Eugene mentioned that the schedule for purchasing SiPMs may run into project reviews if we do not move on this. The time constraints are related to the fact that this will be a contract awarded to a foreign country, as e expect both Hamamatsu and SensL to submit bids. However, there is nothing holding up the bidding process and work on this will commence immediately.
  2. Review of Action Items
  3. Calibration/Monitoring: George Voulgaris presented tests on the FCAL monitoring system, see: Media:lucite_athens.ppt. Additional tests are pending. Optical joint and cross talk issues will be considered, as will the amount of light that will be injected into the Pb-Glass blocks.
  4. FCAL
    • Radiation Damage Studies: File:FCAL RadiationDamage 100121.pdf
    • Fabrication contract: it is stuck at IU's legal department, waiting for IU to submit a small/diversified contractor plan.
    • CR for rad hard glass: Brad gave a presentation, see: File:FCAL RadiationDamage 100121.pdf. The goal is to determine the number of rad hard blocks needed so as to enter it at the same time in the change request for the redesign of the FCAL. The original vendor (Russian) will make the blocks. The Primakoff lead-tungstate blocks do not fit.
    • PMT procurement: nothing to report.
  5. BCAL
    • Construction Status:
      • Module 01: complete, machined, optical tests pending (method is now final and equipment in place).
      • Module 02: complete, top plate is being glued, will be shipped to Ross Machine Shop next week. Crate design is complete and the first of these new crates will be used next week.
      • Module 03: matrix build is at 40%.
    • Fibre tests: Shipment 7 tests were completed. Again a systematic variation is seen with respect to other shipments. This and the results from shipment 8 (testing in progress) will be reported at the Collaboration meeting.
  6. BCAL Readout:
    • Carl has carried out tests with the SensL arrays. He finds no compelling reason to exclude SensL from the bidding process, as the combination of PDE and gain from both vendors is comparable. Fernando reminded us that SensL claims to be able to adjust the quench resistor so as to have a pulse recovery time within our specs (80ns, it is 180 ns now). Both products need cooling, SensL more so for noise reduction, Hamamatsu for stabilization. SensL pins interfer somewhat with Peltier cooling plate.
    • Will repoted on Elton's visit to Chile. Facilities were inspected and meetings with brass were done. MOU is nearly in final form and USM officials see no concerns. For the fabrication/testing USM will place 5-6 FTEs. Regina will contribute to testing a fraction of the SiPMs. Some (friendly) Northern vs Southern hemisphere competion, and long-distance travels between Chile and Canada will be arranged!
  7. Simulations: Irina/Andrei finished the simulations to examine the effect that the fibre spread in terms of attenuation length and Npe have on the calorimeter's performance. These will be reported by Zisis/Irina during the Collaboration meeting next week.
  8. Organization of Calorimetry Session for the Jan 28-30 Collaboration Meeting
    • Calibration Presentation: one (Christina)
    • FCAL talk(s): Two, Matt (Update), Brad (Rad Hard Blocks)
    • BCAL talk(s): One (Zisis)
    • Readout talk(s): Three (Fernando, Carl, Elton/Pedro)
  9. Other business: none; next Calorimetry Working Group meeting will be on February 4.