Difference between revisions of "GlueX Start Counter Meeting, December 20, 2010"

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(Agenda: add Sascah)
(notes as minutes)
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[http://evo.caltech.edu EVO]: [http://evo.caltech.edu/evoNext/koala.jnlp?meeting=eiese9vBvvata2aDIi direct meeting link], phone bridge ID: 7 7569 <!-- This link is good through Jan. 13, 2011 --><br>
 
[http://evo.caltech.edu EVO]: [http://evo.caltech.edu/evoNext/koala.jnlp?meeting=eiese9vBvvata2aDIi direct meeting link], phone bridge ID: 7 7569 <!-- This link is good through Jan. 13, 2011 --><br>
 
'''Slides''': talks can be deposited in the directory <code>/group/halld/www/halldweb1/html/talks/2010-12</code> on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2010-12/ .
 
'''Slides''': talks can be deposited in the directory <code>/group/halld/www/halldweb1/html/talks/2010-12</code> on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2010-12/ .
 +
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=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

Revision as of 19:19, 20 December 2010

Location, Time

Monday, December 20, 2010
1:30 pm EST
JLab: CEBAF Center, Room F228

Agenda

  1. Announcements
  2. Review minutes from previous meeting: all
  3. Start Counter News: Werner
  4. Neutron flux and Start Counter SiPM's: Sascha
  5. Photodetector decision process: all
  6. 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