GlueX Start Counter Meeting, June 2, 2011

Location, Time

Thursday, June 2, 2011
3:30 pm EDT
JLab: CEBAF Center, Room F326/7

Agenda

1. Announcements
   • Mantis problem tracker: new project Start Counter
2. Review minutes from previous meeting: all
3. Start Counter News
   1. Fiber information
      • Carl responded saying we should talk to Kuraray
      • Elton sent letter to Kuraray folks
   2. New SiPM amplifier, see https://mailman.jlab.org/pipermail/halld-pid/2011-April/000157.html
   3. SiPM order for FIU, see https://mailman.jlab.org/pipermail/halld-pid/2011-April/000159.html
4. MOU status
   • Sent latest version to Allison on May 5.
   • got comments from Glenn Young on May 17.
   • Sent Glenn's comments to Werner today.
   • Will incorporate Glenn's comments and re-submit to Allison.

Communication Information

Telephone

To connect by telephone:

1. dial:
   • US and Canada: (866)740-1260 (toll free)
   • International: (303)248-0285 (toll call) or look up toll-free number at http://www.readytalk.com/intl
2. enter access code followed by the # sign: 3421244#

Video Conferencing

• ESNet: 8542553
• EVO:
  • Meeting URL: http://evo.caltech.edu/evoNext/koala.jnlp?meeting=eaeDetvlv8a9asasIa
  • Phone Bridge ID: 8 5557

Slides

Talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2011-2Q on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2011-2Q/ . You have to be a member of the "halld" Unix group to do this.

Minutes

start counter meeting minutes

• notes as minutes • present

Notes

Mark Sascha Beni Werner Lei

kuraray contacted 1 mm square fibers, enough for one paddle clamped to a shape that can be attached to scintillator

will get scintillator by june 13

measuring with slow pipm to understand from width of pedestal, with leading edge, measureing rise time, conclude that noise is driving resolution

have not used constant fraction discriminator, easier to work with leading edge

correct for walk with software, rise time and sigma of noise

sipm's have arrived,

fernando has made pre-amps for them gains are 35 and 70 both look good measurements done with reference pmt want to do measurements ourselves

fernando on vacation, ask monday for new pre-amp

will build light guide with clear fiber

tuesday werner will be here

special electronics

30 vs 40, more space, each detector ratio of machined area to pressed area better for 30 paddle 15 mm for 40, 12 mm

drawings will be done at jlab

segmentation question from Sascha : werner motivated by aspect ratio thing