GlueX Start Counter Meeting, November 15, 2012

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GlueX Start Counter Meeting
Thursday, November 15, 2012
10 am EDT
JLab: CEBAF Center F326/327

Agenda

  1. Announcements
  2. Review minutes from previous meeting
  3. Mechanical Design
  4. Read-out Design
  5. Simulation: Thickness studies
  6. Contract

Communication Information

Video Conferencing

Slides

Talks can be deposited in the directory /group/halld/www/halldweb1/html/talks/2012-4Q on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2012-4Q/ .

Minutes

Present:

  • FIU: Werner Boeglin, Puneet Khetarpal, Eric Pooser
  • JLab: Chuck Hutton, Mark Ito (chair), Beni Zihlmann

SiPM Gain Measurement

Eric has done a single photo-electron measurement on a tube to determine its gain as a precursor to measuring the SiPM gain. Fernando Barbosa is waiting on this measurement to finalize his design.

Scintillator Quality

After about a month, the scintillator bars (those that were not broken) are showing visible signs of deterioration, with crazing on many areas of the surface. FIU showed photos of bars illuminated from one end by a diffuse laser light source. Loss of light is clearly seen. image???

Werner has been in contact with McNeal about their handling practices. Recall that instructions on how to properly handle scintillator had been sent the the company and they claim that those procedures were followed. Yet some samples of the same scintillator material retained at FIU do not show any degradation.

FIU will go ahead and test the bars in any case. They are considering how to proceed. The quality of the machining done at McNeal is fine. The question is whether or not the material handling problem can be solved.

Light Yield Studies

Equipment Difficulties

mainframe hv died, can only turn on 2 or three channels 1454 want to borrow something CAEN unit belongs to pyrex need 6 channels model number for caen mainframe look at hall b mainframe caen sy2527

dollar amount of contract, does that sijmplify

frame proposal writing process for werner measure scintillators get them started on next batch no money, get started on next batch 

 is there a way we can fund them
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