Revision as of 09:04, 4 December 2009

Teleconference Time: 11:00 a.m. EST

• ESNET and EVO session
• Phone:
  • +1-800-377-8846 : US
  • +1-888-276-7715 : Canada
  • +1-302-709-8424 : International
  • then enter participant code: 77438230# (remember the "#"). Phone connection only upon request.

Items for followup from previous meeting

1. Order prototype light guides (Elton)

Documents to Review

1. Plan for SiPM Testing (Carl and Fernando)
   • BCAL Readout Tests Using The Hamamatsu 4x4 Array
   • BCAL Readout Tests Using the SensL 4x4 SiPM Array
   • Report on Hamamatsu MPPC arrays

Tentative Agenda

1. Announcements
2. Review of Action Items
3. Results of tests of SiPMs (Fernando and Carl)
4. USM report
5. Light Guide Geometry
6. Light Guide Simulations
7. Discussions on MOU with USM

Minutes

Attending: Fernando, Carl, Elton, Eugene, Chuck, John, Beni (JLab); Zisis, George (UofR); Will, Alam (USM).

1. Announcements
2. Review of Action Items
   • Communication with Plastic Craft has not been very good and the light guide order has not been placed.
3. Results of tests of SiPMs
   1. Electronic certification (Fernando)
      • Fernando has completed the electronic certification of both Hamamatsu and SensL. Hamamatsu devices have met all our specifications. SensL package quality is very good and accompanied by quality documentation. However, the pulse lengths are about 200 ns long, exceeding our requirements.
      • Fernando has posted GlueX-docs summarizing the tests.
   2. Detector performance (Carl, see presentation posted)
      • Hamamatsu devices have been characterized for uniformity, dark current and PDE, achieving expected results in all areas.
      • Measurement of the amplitude vs changes in operating voltage show that there is a 10% amplitude variation for 56 mV change in Vop (or 1deg C).
      • Fernando: going forward, we will need to concentrate on mechanical and cooling considerations. This includes temperature stabilization in combination with bias compensation to thermistor changes.
      • Will: Have timing tests been performed with the sensors? No, but Fernando has measured the rise time (about 15 ns for both sensors). Scope pictures show that the response is quite uniform to LED pulsed illumination.
4. USM report
   • Grant funds have been received, and they are diligently using them to setup the lab.
   • Serguei has been investigating options for purchasing light guides for various sources. A German company is a possible vendor (PTW-Freiburg, Physikalisch-Technische Werkstaetten, Dr. Pychlau GmbH, Loerracher Str. 7, D-79115 Freiburg, Germany) [1]

1. Light Guide Geometry
2. Light Guide Simulations
3. Discussions on MOU with USM