GlueX Start Counter Meeting, December 20, 2010
Contents
Location, Time
Monday, December 20, 2010
1:30 pm EST
JLab: CEBAF Center, Room F228
Agenda
- Announcements
- Review minutes from previous meeting: all
- Start Counter News: Werner
- Neutron flux and Start Counter SiPM's: Sascha
- Photodetector decision process: all
- MOU plans: all
Communication
Conference Group, US: 800-377-8846, Canada: 888-276-7715, International: 302-709-8424
participant code: 77438230
ESNet: 8542553
EVO: direct meeting link, phone bridge ID: 7 7569
Slides: talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2010-12 on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2010-12/ .
Minutes
Start Counter Meeting Notes, 12/20
werner, lei, mark, sascha
esr sheets sent to fiu
• 500$ test work for 8 pieces, down to 3 pieces • can do bending for no charge • failure rate 3 of 8 • few hundred per counter • perhaps buy in sheets • data acquisition
neutrons • linked to bcal page • dose comparable to bcal SiPM region • polyethylene shielding helps, studied for the tagger, factor of 7 • support structure could be made out of shielding material
• W. wants to look with new SiPM. timing dominated by light output • Richard simulated discriminator with damaged sipm, timing resolution OK with a factor of 50 increase in timing resolution, he expects 300 pe total • W. can change current with temperature. • sc rate 12 kHz, vs 1 MHz for microscope • ask Carl how hot does it have to be.
• focus on SiPM • same SiPM as BCAL • W has a 4x4 array • W has one, F10943, Hamamatsu • ask Carl for another one • language • MRI possibility
• changing set-up to do light output measurement to accomodate SiPM as main detector • new scintillators as well, 2 mm and 3 mm • 12 and 15 mm wide: 30 element for 15 mm • light output reduced by edges, wider has fewer edge area fractionally
• light guides design • • tin viewer
