Difference between revisions of "GlueX Start Counter Meeting, June 2, 2011"

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* '''JLab''': Mark Ito (chair), Sascha Somov, Beni Zihlmann
 
* '''JLab''': Mark Ito (chair), Sascha Somov, Beni Zihlmann
  
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kuraray contacted
+
==Fiber Order==
−
1 mm square fibers, enough for one paddle
+
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clamped to a shape that can be attached to scintillator
+
  
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will get scintillator by june 13
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Lei contacted Kuraray and ordered 1 × 1 mm fibers. They have arrived. They will be clamped into a shape that can be attached to a scintillator.
  
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measuring with slow pipm to understand from width of pedestal, with leading edge, measureing rise time, conclude that noise is driving resolution
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==Scintillator Order==
  
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have not used constant fraction discriminator, easier to work with leading edge
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The scintillator will arrive from Plastic Craft by June 13.
  
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correct for walk with software, rise time and sigma of noise
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==Resolution Studies==
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Werner is doing measurements with the SiPM array he has to try to understand the source of the timing variance. Using a leading-edge discriminator he is trying to predict the resolution one should expect from the width of the pedestal (noise), and the measured rise time of signals. He corrects for time walk in software. So far he sees resolution consistent with noise driving the observed resolution.
  
 
sipm's have arrived,  
 
sipm's have arrived,  

Revision as of 09:50, 3 June 2011

Location, Time

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

Agenda

  1. Announcements
  2. Review minutes from previous meeting: all
  3. Start Counter News
    1. Fiber information
    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:
  2. enter access code followed by the # sign: 3421244#

Video Conferencing

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

Present:

  • FIU: Werner Boeglin, Lei Guo
  • JLab: Mark Ito (chair), Sascha Somov, Beni Zihlmann

Fiber Order

Lei contacted Kuraray and ordered 1 × 1 mm fibers. They have arrived. They will be clamped into a shape that can be attached to a scintillator.

Scintillator Order

The scintillator will arrive from Plastic Craft by June 13.

Resolution Studies

Werner is doing measurements with the SiPM array he has to try to understand the source of the timing variance. Using a leading-edge discriminator he is trying to predict the resolution one should expect from the width of the pedestal (noise), and the measured rise time of signals. He corrects for time walk in software. So far he sees resolution consistent with noise driving the observed resolution.

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

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