GlueX PID Meeting, June 11, 2010

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Location, Time

Friday, June 11, 2010
2:00 pm EDT
JLab: CEBAF Center, Room F326/7
ESNet: 8542553
EVO: direct meeting link (good through 8/20)
Conference Group: 800-377-8846, participant code: 77438230
Slides: talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2010-06 on the JLab CUE (you have to be a member of the "halld" group). This directory is accessible from the web at https://halldweb1.jlab.org/talks/2010-06/ .

Agenda

  1. Announcements
  2. Minutes from the last meeting
  3. Time-of-Flight
    1. Prototype progress
    2. Status of the MOU
  4. Start Counter
    1. prototype progress
      • attenuation length measurements
  5. Target
    1. Status of the MOU
    2. Status of refrigerator plan
  6. Action Items

Minutes

pid meeting notes, 6/11/10

• jlab, beni, tim, tom, simon, chris, sascha • fsu, sasha, paul • umass • fiu

comment from chris, edge of liquifaction capacity if hydrogen target could get us over the edge frozen spin is more of a load , polarized target, but a pulse tube refrigerator might cover that as well ball is in tims court now

pulser cannot easily be changes in amplitude athens scheme talk to elton about calibration system in hall b right now working on testing system at fsu nichia led stability of pmts is an issue time walk done once per year not necessary to do continuously g12 used laser to calibrate tof 1/3 of channel the time walk with the laser data from run in 2001, worked well, time variation in correction very slow dr carman still doing it: tom potentially lser for hall a kevin gio for calorimeter, nitrogen laser

change of thickness of counters • pmt has min cathode diameter of 46 mm • cutting ert to 46 mm diameter, • cookie on one end of bar • light reflect out to see if any coming in outside that diameter • current plan: silicon cookies, silicon sheets from eljen[sp?] • initial glued pmt • tim has done lay-outs • rtv glue possibility, eugene

wrapping • large sample of esr df2000 ma • studies about to start • final light tighe overwrapping, still wait

changing the dac

• received ti board • will be running with led • use a real triggered system • to match adc's and tdc's • vme64 bridge, not using coda • working on program to control


changing trigger paddles to use longer counters to improve rate

MOU

• DOE grant has off campus overhead rate • discussion with chair on MOU. waiting to hear back on overhead rate, • argue that saving money to doe by paying a lower rate

two full length some beam hole length to be machined

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