GlueX Start Counter Meeting, March 25, 2011

Location, Time

Friday, March 25, 2011
4:30 pm EDT
JLab: CEBAF Center, Room F326/7

Agenda

1. Announcements
2. Review minutes from previous meeting: all
3. Start Counter News
4. MOU status

Communication Information

Telephone

To connect by telephone:

1. dial:
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2. enter access code followed by the # sign: 3421244#

Video Conferencing

• ESNet: 8542553
• EVO:
  • Meeting URL: http://evo.caltech.edu/evoNext/koala.jnlp?meeting=M2MvMB2e28DMDs9v9lDM92
  • Phone Bridge ID: 312 1612

Slides

Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2011-1Q on the JLab CUE. This directory is accessible from the web at https://halldweb.jlab.org/talks/2011-1Q/ . You have to be a member of the "halld" Unix group to do this.

Minutes

Present: Werner Boeglin, Eugene Chudakov, Lei Guo, Mark Ito (chair), Simon Taylor, Beni Zihlmann

We had an informal discussion of various issues related to the start counter.

• Werner is going to test some 3x3 mm fibers for light guides
• Currently FIU is seeing 20 ns rise time from the 16 cell array.
• Werner is interested in getting another pre-amp for the SiPM*
• He is also interested in obtaining a Peltier element; he is hopeful that cooling the SiPM may help timing resolution.
• Mark will set up a conference call with Werner, Fernando Barbosa, and Yi Qiang to discuss the previous two items.
• Beni lent the FIU guys an Ortec constant fraction discriminator (physically handed it over) to see if that helps with timing resolution in their set-up.
• Puneet Khetarpal, an FIU post-doc, might be able to start working on the start counter project part-time. His main responsibilities are in Hall B.
• The MOU between FIU and JLab will be circulated next week among Hall D staff for comment.