April 15, 2008 Calorimetry
From GlueXWiki
Connection
- The meeting will be held at 10:30 am ET
- 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
- Previous minutes: March 21, 2008 Calorimetry
- Schedule, Tracker and Drawings (gluex pass)
- Schedule
Tentative Agenda
- Review Options for Working Group Meeting Time
- Calibration Update / Discussion (Athens)
- Goals for calibration
- Deployment in various subsystems
- FCAL Update
- A few plots that show typical FADC response and time resolution that migh be achieved (Mihajlo)
- BCAL Update
- Reanalysis of timing resolution from cosmics (Media:talk080415.pdf) - Andrei/Irina
- SiPM gain non-uniformities and energy resolution [1] (Richard)
- SiPMs
- Phone conference yesterday. Divided shipments of 1 mm2 A20HD and A35HD and 3 mm2 A20HD units shipped to UofR and JLab. 3mm2 A35HD units delayed by 4-6 weeks. Testing to be conducted upon receipt:
- UR tests
- IV curves
- Scanning SiPMs for uniformity. Current illumination is 1mm diameter, but improving setup to 0.25 mm diameter to allow for finer scans.
- 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
- IV curve
- Linearity of response
- Relative gain
- Dark rate
- Timing characteristics. [Notes from George: timing response of newer glass arrays show rise times of about 10 ns, and contained in a 70-75]
- Later, not in initial tests: temperature dependence of units.
- Fiber Specifications
- Response of Kuraray and St. Gobain to the request to JLab sources sought / do we need more samples?
- Summary of fiber spectra analysis (Alex) [2]
- How to specify a) Fiber color/spectrum and b) light output
- JLab Tests (Carl)
- Review of Action Item Tracker
- Fabrication plan and QA /visit to Alberta?
- Any other business