Mar 19, 2009 Calorimetry

Teleconference Time: 4:00 p.m. EST

• Phone:
  • +1-800-377-8846 : US
  • +1-888-276-7715 : Canada
  • +1-302-709-8424 : International
  • then enter participant code: 39527048# (remember the "#")

Items for followup from previous meeting

1. Resolution studies (Blake)
   • Develop criteria for evaluating resolution studies
   • Study impact of inactive material at the end of BCAL on acceptance.
   • Check what configuration (thresholds, step sizes, stack? parameters for secondaries, etc) is being used for the Hall D simulations (Regina)
2. Review options for import/export to Chile (loans, donations, transfers, etc.)
3. From stand-alone MC, or previous notes, collect the distribution of photons expected for numbers of photons for various showers (especially at low energies, e.g. 50 MeV - 200 MeV) and typicall positions (i.e angles) along the calorimeter. (Andrei).

Documents to Review

1. Fiber Summaries (JLab)
   • Kuraray measurements of light output
   • Kuraray measurements of attenuation length
2. Fiber Measurements
   • Kuraray Fibre Tests - Regina

Tentative Agenda

1. Announcements
   • USM receives major grant, which includes substantial support for Hall D hardware testing as part of the major detector lab instrumentation funding.
2. BCAL Update
   1. Kuraray Fibre Tests - Regina
   2. Preparations for construction
3. Cooling of BCAL Readout
4. FCAL Update
   • Note from Matt (on travel): As for progress on my end, I have 3/4 of a technical note finished on implementation of the BCAL electronics threshold in software. I hope to finish that off by next week and circulate it. You can put me on the agenda for the next calorimetry meeting to discuss both the threshold and also implementation of dark noise in the simulation.
5. Simulations
6. Review of Action Items

Minutes

1. Announcements
   • USM receives major grant, which includes substantial support for Hall D hardware testing as part of the major detector lab instrumentation funding. Five institutions received awards, USM received $5M over five years. Some of the funding will be dedicated toward setting up a lab to measure light sensor performance automatically.
2. BCAL Update
   1. Kuraray Fibre Tests - Regina
   2. Beni has reported on his results before. He has recently done some systematic studies (to be added to the web) by modifying the far end of the fiber.
   3. Preparations for construction
      • MOU signatures are being collected at UofR
      • PR for bcal construction to be submitted next week. Statement-of-work, solesource, reference schedule, Advanced Procurement Plan (APP) are completed
      • PR for Bcal construction manager has been signed.
3. Cooling of BCAL Readout
   1. SiPMs: Must operate at ~ 5 degC. Delta_G/G 1/Delta_T (% per deg C)
      • DESY Seminar Garutti: MEPHI/Pulsar -1.7%/degC, Delta_Q/Q 1/Delta_T = -4.5%/degC (Q = Gain*PDE)
      • Carl: SensL A20L, Delta_amplitude/amplitude -2%/degC
      • Hamamatsu catalog: S10362-11-025U/C: -1.9%/degC
      • Richard: Photonique: -1%/degC
      • Lightfoot: SensL: -0.9 %/degC
   2. APDs: Can operate at room temperature ~ 20 degC. Delta_G/G 1/Delta_T
      • Atoain Table 2: API 630-70-74-510: -3%/degC
      • Atoian Table 2: RMD S1315: -3%/degC
      • Atoian Table 2: EG&G C30703E: -4%/degC
      • Atoian Table 2: Hamamatsu S8664-1010N: -4.5%/degC
   3. Goals?
      • For a 5% gain stability need temp stabilization ~ 1 degC.
      • Note: Hall B stabilization of PbW04 Inner calorimeter with APD readout spec was 0.1degC (achieved 0.02degC)
      • Elton proposed to use Delta T < 0.1 degC as a goal for a cooling and/or temp stabilization scheme and determine how difficult this will be. This would keep gain variations below 0.5%.
      • There was quite a bit of discussion related to how to mount the SiPMs, light guides and connections. It was decided for JLab to have some informal discussions on various concepts to be presented at the next meeting.
4. FCAL Update
   • Note from Matt (on travel): As for progress on my end, I have 3/4 of a technical note finished on implementation of the BCAL electronics threshold in software. I hope to finish that off by next week and circulate it. You can put me on the agenda for the next calorimetry meeting to discuss both the threshold and also implementation of dark noise in the simulation.
5. Simulations
6. Review of Action Items