Sep 30, 2010 Calorimetry

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Teleconference Time: 11:00 a.m. EDT

  • ESNET and EVO session
  • Phone in CC F326 is 757-269-6337
  • Phone in the Regina Videoconference Suite is 306-585-4204
  • 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. Monitoring
  2. Fcal
    • Tim to check on magnetic checks of non-corrosion coated shield. Measurements completed. Tim will forward results.
  3. SiPM decision
    • IU: geometry for summed units
    • JLab: Complete testing of radiation damage to sensors, temperature dependence, etc.

Tentative Agenda

  1. Calibration (Athens)
  2. Announcements
    • Change of meeting time?
  3. Review of Action Items
  4. FCAL
    1. (Update from Matt): There are no major updates from the FCAL. We were assembling the final batch of CW prototypes, but I have not yet heard whether they are all together and working.
  5. BCAL
    1. Construction Status
  6. SiPM update
  7. Simulations
  8. Other Updates


Attendees: Yi, Elton, Tim, Eugene, Beni (JLab); Will, Alam (USM).

  1. Announcements
    • Due to change of time for the Lehman closeout, the meeting started at 11:30.
    • Elton has requested that Zisis and Matt turn in their EVMS reports today in preparation for the progress meeting tomorrow.
  2. Review of Action Items
    • Magnetic measurements of the comparison of coated (new) and uncoated magnetic shields has been completed at 180 G. Tim will forward the results.
  3. FCAL
    1. (Update from Matt): There are no major updates from the FCAL. We were assembling the final batch of CW prototypes, but I have not yet heard whether they are all together and working.
  4. BCAL
    1. Readout
      • Alam has received components for the electronic test boards and will start assembly.
      • Will is waiting for feedback from Elton on division of responsibilities for various parts of the readout project. Elton and Eugene will discuss this afternoon and provide feedback.
      • Eugene: Notes that the schedule presently has the light guides as a large procurement in November. We will need to decide on whether it should be included into a single large contract with USM. The design needs to be finalized and verified with measurements.
      • There is also substantial budget for the effort to cool the SiPMs. There have been discussions with the detector group, consulting with Fernando, to request some of their resources and expertise to be placed on the project. There is a draft agreement for electrical engineering time as well as time from Carl for testing of SiPMs.
    2. Construction Status:
      • The stacking of Modules 19 and 20 was finished this week, and both modules were transported to RMS this morning. The long sides of Mods 17 and 18 have been machined. Shipment 5 (Mos 17-20) is estimated around the 3rd week of October. RMS has been given instructions on keeping the modules clean and to carry out a closer inspection of the polished faces.
      • We will proceed with using Reefer (refrigerator) trucks for shipments during the cold months.
      • Fibre testing on the Npe side continue with Shipment 14.
  5. SiPM update
    • Recovery times, tau, are being tracked. At 60 degrees, tau~ 0.8 days, at 25 deg, tau=6 days, at -5 deg (fixing the unrecoverable damage to that at 25 and 60 deg) tau~47 days.
    • Revovery measurements will continue at -5 and 25 deg. The samples at 60 deg will be re-irradiated to check whether baseline is affected by a second irradiation. The recovery of this set after second irradiation will be done at 40 deg to get another point on the recovery curve.
    • The recovery times were plotted vs temperature, and shown to have the SAME dependence as the dark rate. Yi does not think this is a coincidence, but indicates that temperature dependence of the charge mobility in the silicon affects both the dark rate and their recovery.
    • These data willl be very valuable in deciding on an operation plan for the SiPMs.
  6. Simulations
  7. Other Updates