April 4, 2008 Calorimetry

Connection

• The meeting will be held at 1:00 pm ET (11:00 am MST)
• Phone:
  • +1-800-377-8846 : US
  • +1-888-276-7715 : Canada
  • +1-302-709-8424 : International
  • then enter participant code: 39527048# (remember the "#")

Reference Documents

1. Previous minutes: March 21, 2008 Calorimetry
2. Schedule, Tracker and Drawings (gluex pass)
3. Schedule

Tentative Agenda

1. Review Options for Working Group Meeting Time
2. SiPMs Schedule
   • Criteria for selecting SiPM type
   • Testing procedures
     • What
     • Where
3. Fiber Specifications
   • Response of Kuraray and St. Gobain to the request to JLab sources sought / do we need more samples?
   • How to specify a) Fiber color/spectrum and b) light output
   • JLab Tests (Carl)
4. Review of Action Item Tracker
   • Fabrication plan and QA /visit to Alberta?
5. FCAL Update
   • A few plots that show typical FADC response and time resolution that migh be achieved (Mihajlo)
6. BCAL Update
7. SiPm gain non-uniformities and energy resolution (Richard)
8. Calibration Update / Discussion (Athens) - postponed to next meeting
   • Goals for calibration
   • Deployment in various subsystems
9. Any other business

Minutes

Attending: UR Zisis, George, Andrei, JLab: Fernando, Tim, Jim, Stewart, Elke, Elton, Carl, Eugene.

1. Review Options for Working Group Meeting Time
   • Next meeting will be Tuesday 10:30 ET April 15.
2. SiPMs Schedule
   • Criteria for selecting SiPM type.
   • Shipping of SiPMs is becoming problematic. Elke suggested paying for shipping directly to Regina. 2 units to Regina of each type, 3 units to JLab of each type.
   • UR tests
     1. IV curves
     2. Scanning SiPMs for uniformity. Current illumination is 1mm diameter, but improving setup to 0.25 mm diameter to allow for finer scans.
     3. Use coupling to fiber array to measure light yield and normalized to the number of photoelectrons. [Array is about 2x1.8x25 cm3. On one side the fibers are flared out and coupled to a Winston Cone guide.
   • JLab tests, use optical setup using LEDs
     1. IV curve
     2. Linearity of response
     3. Relative gain
     4. Dark rate
     5. Timing characteristics
3. Fiber Specifications
   • Response of Kuraray and St. Gobain to the request to JLab sources sought / do we need more samples?
   • How to specify a) Fiber color/spectrum and b) light output
   • JLab Tests (Carl)
4. Review of Action Item Tracker
   • Fabrication plan and QA /visit to Alberta?
5. FCAL Update
   • A few plots that show typical FADC response and time resolution that migh be achieved (Mihajlo)
6. BCAL Update
7. SiPm gain non-uniformities and energy resolution (Richard)
8. Calibration Update / Discussion (Athens) - postponed to next meeting
   • Goals for calibration
   • Deployment in various subsystems
9. Any other business