GlueX Start Counter Meeting, September 22, 2011

10 am EDT
JLab: CEBAF Center, Room F326/7

Agenda

1. Announcements
2. Review minutes from previous meeting: all
3. Prototype Report
4. MOU status
5. Simulation Status [1]

Communication Information

Video Conferencing

• ESNet: 8542553
• EVO:
  • Meeting URL: http://evo.caltech.edu/evoNext/koala.jnlp?meeting=292I2iMeMB9M9nDD9aD9
  • Phone Bridge ID: 10 1295

Slides

Talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2011-3Q on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2011-3Q/ . You have to be a member of the "halld" Unix group to do this.

Minutes

Present:

• FIU: Werner Boeglin, Puneet Khetarpal, Lei Guo, Eric Pooser
• JLab: Eugene Chudakov, Chuck Hutton, Mark Ito (chair), Tim Whitlatch, Beni Zihlmann

• Eric has been looking at more of the scintillator pieces from Plastic Craft. They have poor surface quality and an attenuation length 4 times worse than when they arrived from Eljen. He is getting a time resolution in the range 230 ps to about 600 ps, going from the upstream end out to the nose. He is using the SiPM as a detector, with no light guide. All of the pieces will be assessed, shipped back to Plastic Craft for resurfacing, and then re-tested.

looking at new scint from eljen, a factor of 4 worse attenuation length poor surface quality w/ w/o vm2000 light output unchanged in nose time resolution gets better closer to upstream end sipm range 230 ps to about 600 ps no light guide 13x13 mm, 2mmx3mm not touching

mechanical design hand-layout of putting sipm inside bore of CDC we can fit need 24 3 inches: 24 10+ inches: 28 10+ inches: whatever

scintillating fibers

4cm

200 kHz/paddle at high luminosity

simulation

problem with placement of SiPM