Feb 18, 2010 Calorimetry

Teleconference Time: 11:00 a.m. EST

• ESNET and EVO session
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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.
   • Investigate mechanical issues associated with supporting lead glass on top of shashlik modules (Serguei)
3. Bcal
   • Specify the normalization and dynamic range for the number of photons/GeV in showers
   • Decide on specific grouping for SiPM sums
   • Possibility of using air gap for SiPM coupling
   • Finalize shapes of "Winston guides"

Tentative Agenda

1. Announcements
2. Review of Action Items
3. Calibration/Monitoring
   • Light sources in Bcal
4. FCAL
   • Radiation Damage Studies.
     • See Shashlyk Calorimeter Radiation Study
     • Timeline/process for making a decision and Change Request
   • Fabrication contract
   • PMT procurement
5. BCAL
   • Construction Status
   • Fibre tests
6. BCAL Readout
   • Simulations
   • SiPMs: Timeline for RFP and response
     1. Sources sought inquiry ~ completed?
     2. Finalize specifications ~ Feb 22
     3. Submit PR for purchase ~ Feb 26
     4. Issue the Request for Proposals (RFP) ~ Mar 30
     5. Five Samples required prior to proposal evaluation
     6. Evaluation of proposals ~ May
     7. Contract award based on best-value
     8. Project plan is to purchase 4000 units, but may be split between institutions
     9. JLab Award for 20%, with option to purchase remaining 80%
     10. If not purchased by JLab, remaining 80% will be purchased by our collaborators at Universidad Tecnica Federico Santa Maria (Chile)
     11. Note: Two separate procurement agencies will be involved: JLab and USM.
   • Light guides. See GlueX-doc-1432 Figures 1,2,13,14.
   • Geometry for guides, sensors, cooling and cables
   • Update on USM MOU
7. Other business

Minutes

Attendees:Elton, Pedro, John, Yi, Fernando, Tim, Lubomir, Beni (Jlab); Christina, George (Athens); Matt (IU); Zisis, George, Andrei (UofR); Will (USM)

1. Announcements
   • Athens connected via ESNET and communication was great.
2. Review of Action Items
3. Calibration/Monitoring
   • Regina will investigate the effort/timescale for placing LED pulser system on calorimeter modules for testing
   • Elton asked about the possibility of pulsing fewer LEDs and running fibers to each light guide. George said that they would investigate this option
   • Chuck Hutton is updating the solid model of the detector with light guides and SiPMs. Expect a preliminary layout by next week.
4. FCAL
   • Radiation Damage Studies. Brad is completing a technical note on the radiation studies.
     1. See Shashlyk Calorimeter Radiation Study. Plots indicate that significant degradation in performance begins at about a 1 MRad. Tests were made for Hall A, where their application requires operation up to about 100 kRad.
     2. Timeline/process for making a decision and Change Request.
     3. First: Need to investigate mechanical issues. Lubomir will obtain more details from COMPAS regarding integration of these detectors into their experiment. USM has more information about the modules. Will Brooks/Serguei Kuleshov make these available.
     4. Second: Investigate effect of non-hogenerous materials on shower reconstruction
     5. Third: For the Change Request, it might be sufficient to simply state that the inner region of the calorimeter requires radiation hard detectors, and leave decision about precisely which detectors for later.
   • Fabrication contract has been forwarded to DOE (at JLab) for approval.
   • PMT procurement: Expect 10 samples from new production line in the next week.
5. BCAL
   • Construction Status: Good progress. Module 3 is finished; Mods 2,3 at Ross for machining. As soon as Mod 4 is complete it will be moved to Ross to be machined. On schedule to ship first four units to JLab by April 1.
   • Fibre tests. Shipment #8 completed, and #9 started. Anomalies in #7 are now understood.
   • Lead: Shipment #3 shipped. Will verify needs through the end of construction to add to #4 (last) shipment.
6. BCAL Readout
   • Simulations
     1. Several simulation files were produced last summer with old conversion constants, and should be revisited.
     2. Before generating many files, an agreed-upon list of angles and energies will be developed. Zisis to produce list and obtain feedback.
   • SiPMs: Timeline for RFP and response
     1. Sources sought inquiry ~ completed?
     2. Finalize specifications ~ Feb 22
     3. Submit PR for purchase ~ Feb 26
     4. Issue the Request for Proposals (RFP) ~ Mar 30
     5. Five Samples required prior to proposal evaluation
     6. Evaluation of proposals ~ May
     7. Contract award based on best-value
     8. Project plan is to purchase 4000 units, but may be split between institutions
     9. JLab Award for 20%, with option to purchase remaining 80%
     10. If not purchased by JLab, remaining 80% will be purchased by our collaborators at Universidad Tecnica Federico Santa Maria (Chile)
     11. Note: Two separate procurement agencies will be involved: JLab and USM.
   • Light guides. Postponed till next week Readout meeting. Feedback offline in the interim is welcome.
   • Update on USM MOU. Will and Elton will work to refine the MOU and the sow over the next week. Allison, Glenn, Eugene and Elton will meet next Thursday to review this project.
7. Other business