Latest revision as of 01:50, 1 April 2015

Teleconference Time: 11:00 a.m. EST'

• ESNET (Number is 8542553) and EVO session (GlueX Calorimetry meeting room)
• Phone connection only upon request.
  • +1-866-740-1260 : US+Canada
  • +1-303-248-0285 : International
  • then enter participant code: 3421244# (remember the "#").
  • or www.readytalk.com (and code without the #)

Participant Direct Lines

• JLab Phone: in CC F326 is 757-269-6337 (usual room)
• JLab Phone in CC L207 is 757-269-7084
• Phone in the Regina Videoconference Suite is 306-585-4204
• Athens Phone: in Christina's office is 011-30-210-727-6947

Items for followup from previous meeting(s)

1. Cables
   • Establish cabling for Bcal and Fcal into racks Files sent to Fernando
2. Mechanical
   • Check features in Fcal support structure for cable passages and plexiglas support, and space between window frames on glass and plexiglass (Elton, Tim) Appears that the 3 1.5" holes are adequate.
3. Monitoring
   • Check status of monitoring control boards at JLab (David).
4. Contracts
   • no-cost schedule extension for Fcal (Elton) Extension has been signed.
5. SiPMs
   • Evaluate amount of spare SiPM needed to tack onto the present USM order A full inventory has been conducted. In addition to the 48 units and 1 mini-Bcal, we are short several units to instrument one more module even if all sensors that have been lent our are returned to JLab.

Tentative Agenda

1. Announcements
2. Review of Action Items
3. Monitoring
   1. LED system on Mini BCAL
4. FCAL
   1. Construction Status
      1. Arrival of Steel Frame: FCALPhotos
   2. 2011 Hall B FCAL Beam Test (John)
   3. FCAL PMT Testing Results (Kei)
5. BCAL
   1. Cosmics at Regina
   2. Cosmics run plan (SiPMs) & LEDs at JLab
   3. Update on BCAL Beam Tests 2012
6. USM update
   1. SiPM Update (Javiera)
7. TDR update
   1. Instructions for the TDR (You must be logged into the wiki to access this page).
   2. We need to start revising Chapter 4 Detector, Section 4.3 Calorimetry.
   3. Calibration of Calorimeters
8. Simulations/Reconstruction
9. Any other business

Minutes

Attendees: Elton, Dave, Beni, John, Eugene, Yi (Jlab); Matt, John, Kei (IU), Will, Javiera, Orlando, Hayk, Serguei, Iñaki (USM); Zisis, Andrei (UofR)

1. Announcements
2. Review of Action Items
3. Monitoring
   1. LED system on Mini BCAL
4. FCAL
   1. Construction Status
      • Arrival of Steel Frame: FCALPhotos
      • Structure machined after welding. Some walls are thin and may require backing for bolts. John is test fitting the structure with Al pieces.
      • Question: When to ship to JLab?
      • Vyton is suggested as cushion material at the outside to transmit compression. The material can deteriorate after MRads of irradiation, but should be ok at the outside of the Fcal.
   2. PMT Testing
      • Testing moving smoothly. Board delivery meets assembly schedule. 1100-1500 assembled, tested and burned in. 2% need retesting. Completion expected in August.
      • Cable labeler (suggested by Fernando) purchased, can import labels from xcel file. Will label the cables that are at IU.
   3. 2011 Hall B FCAL Beam Test (John)
      • Analysis progressing smoothly. Results will be presented when ready.
   4. FCAL PMT Testing Results (Kei)
      • Nice summary of pmt testing. Found 58 broken tubes (likely broken before testing). Notice loss of efficiency due to after-pulsing at high rate. They seem to settle down after cycles of testing.
      • Drifting of gain for a couple of hours before they settle down.
      • Andrei: Notes that gain estimated from rates needs to correct for accidentals at high rates.
      • Eugene: Gain on these FEU-84 pmts can change due to charging of the glass. During fabrication the resistivity of the glass needs to be carefully controlled.
   5. Discussion of arrangement of pmts onto detector
      • We decided to use a random arrangement of tubes that exceed specifications. Eugene: tubes with lower specifications can be used at the periphery of acceptance.
5. BCAL
   1. Cosmics at Regina
      • SiPMs used in cosmic runs. Running for 4 days
      • Students are being trained with data.
      • Would like to overhaul DAQ for final stages of running.
   2. Cosmics run plan (SiPMs) & LEDs at JLab
   3. Update on BCAL Beam Tests 2012
6. USM update
   1. SiPM Update (Javiera)
      • Final shipments from Hamamatsu expected this month
      • About 1500 sensors tested in stage 3
      • Fraction of sensors for testing of PDE in stage 2 completed, pending outcome of testing in stage 3
      • Yi: How many outliers have been found? One 1, which has a single dead cell at higher bias.
      • Yi: JLab finds one SiPM that does not meet the uniformity test. What is the distribution at USM? Orlando: PDE uniformity is < 3%
   2. Operating point for SiPMs
      • Serguei: Still investigating optimal operational point.
   3. Light guides (Iñaki)
      • Spare parts for milling machine have not arrived yet. An initial shipment was misplaced and the replacement should arrive this week.
      • To date guides B-F have been milled.
      • Remaining guides (A, G-K) should take about a week to machine once the mill is repaired.
      • Polishing continues. Completed 40%.
7. TDR update
   1. Instructions for the TDR (You must be logged into the wiki to access this page).
   2. We need to start revising Chapter 4 Detector, Section 4.3 Calorimetry.
   3. Calibration of Calorimeters
8. Simulations/Reconstruction
9. Any other business