Feb 4, 2010 Calorimetry

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Teleconference Time: 11:00 a.m. EST

  • ESNET and EVO session
  • Phone in CC F326 is 757-269-6337
  • 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. Calibration/Monitoring
    • Geometry for inputing monitoring sources into Bcal
  2. Fcal
    • Specify the number of Rad Hard blocks to writeup a change request to the project.
  3. Bcal
    • Specify the normalization and dynamic range for the number of photons/GeV in showers
    • Decide on specific grouping for SiPM sums
    • Finalize shapes of "Winston guides"

Documents to Review

Tentative Agenda

  1. Announcements
  2. Review of Action Items
  3. Calibration/Monitoring
    • Light sources in Bcal
  4. FCAL
    • Radiation Damage Studies
    • Fabrication contract
    • CR for rad hard glass
    • PMT procurement
  5. BCAL
    • Construction Status
    • Fibre tests
  6. BCAL Readout
    • Simulations
    • SiPMs update
    • Winston guides
    • Geometry for guides, sensors, cooling and cables
  7. Other business


Attendees: Elton, John, Yi, Pedro, Lubomir, Beni, Eugene (JLab); Christina (Athens); Serguei joined later (USM)
Note: JLab difficulties with connecting to ESNET prevented UofR from joining the meeting.

  1. Announcements
    • None
  2. Review of Action Items
    • List to guide discussion and further work
  3. Calibration/Monitoring
    • Light sources in Bcal. Christina reminded us that her talk in Pittsburgh gave new dimensions for LED pulse electronics. The concept is to place them on the tapered end of the Winston cones for pulsing both near and far end sensors.
    • JLab will investigate geometrical constraints and report at next meeting.
    • Light source in Fcal. Reported at the collaboration meeting. The strategy is clear, although the total number of sources, spectrum and precise location can be determined at a later stage.
  4. FCAL
    • Fabrication contract. Small and disadvantaged businesses (SDB) proposals are under evaluation. We hope package will go to DOE soon.
    • Rad hard glass. Eugene mentioned the possibility of substituting the rad hard glass with shashlik-type calorimeters. GAMS has a shashlik calorimeter that they are planning to use for substitution with the 38mm glass they have. USM has purchased 30 units from COMPAS for use in Hall B. The detectors are fabricated in Protvino (Denisov's lab). There are questions about compatibility, including mechanical issues of supporting the weight of glass. Serguei will request information from COMPAS. These modules will be tested with 5x5 mm2 Hamamatsu APDs at CERN during the summertime.
    • PMT procurement. Eugene is working with contact in Moskov to provide new tubes coming of a new production line for FEU-84 pmts. The plan is to obtain 10 samples for evaluation and then proceed with an order of about 300 if tubes are satisfactory.
  5. BCAL Readout
    • Simulations. Need input on the normalization and dynamic range of photons collected by each sensor in the Bcal. Will defer discussion for when UofR can join.
    • SiPMs update. Elton has produced draft specifications to discussion with companies.
    • Winston guides.
      • Shapes and sizes of all guides need to be evaluated, as well as viability of air gap between guide and SiPM.
      • USM may be able to build and prototype some suggested shapes.
    • Geometry for guides, sensors, cooling and cables. Chuck Hutton is developing the geometry at the end of the Bcal and will show some details next time.
  6. USM activities (Serguei joined toward the end of the meeting)
    • Have received the Baby Bcal!
    • Building test facility for testing SiPMs
    • Received (but still in customs) 150 Zecotek Photonics 3x3 mm2 SiPMs [see NIM A610 (2009) 381]. Will develop mass testing (16 or 32 at a time) for NA61.
    • Serguei will present first results at the Bcal readout meeting next week.
  7. Other business