Difference between revisions of "GlueX TOF Meeting, May 27, 2011"

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(Minutes: report from Paul)
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# Prototype Status [http://hadron.physics.fsu.edu/~ostrov/tof/20110527/]
 
# Prototype Status [http://hadron.physics.fsu.edu/~ostrov/tof/20110527/]
 
# Contract Status
 
# Contract Status
#* [http://argus.phys.uregina.ca/cgi-bin/private/DocDB/ShowDocument?docid=1713 Schedule]
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#* [https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=1713 Schedule]
  
 
=Communication=
 
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==Slides==
 
==Slides==
  
Talks can be deposited in the directory <code>/group/halld/www/halldweb1/html/talks/2011-2Q</code> on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2011-2Q/ .
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Talks can be deposited in the directory <code>/group/halld/www/halldweb/html/talks/2011-2Q</code> on the JLab CUE. This directory is accessible from the web at https://halldweb.jlab.org/talks/2011-2Q/ .
  
 
=Minutes=
 
=Minutes=
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</blockquote>
 
</blockquote>
  
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==Status Report from Sasha==
  
repeat resolution measurements with
+
Sasha reported on several items.
cosmics
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light guide production, 6 of them, one not bent
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* The new crate is working well. Now, all modules can be plugged into the single crate with no sag in the power supplies.
now light guides glued
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* He showed [https://halldweb.jlab.org/talks/2011-2Q/Latest%20on%20TOF%20prototype.html plots] on two topics:
 +
*# '''ADC spectrum with Americium source'''. Paul put together a source/scintillator package that can be used to test PMT's as they arrived. The energy peak is clearly visible.
 +
*# '''Troubleshooting multiple timing peak problem'''. The troublesome multiple peaks seen previously have been eliminated. They were due to very large pulses coming from discharge of the cathode to wrapping material on the trigger phototubes.
  
one straight, one bent comparison
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==Summary of Goals from Beni==
tapered section factor of two longer, with same overall length
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  see effect of taper
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  both straight light guides
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try elgen discriminator with new set-up
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talked to tim
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Beni went through the near-term goals based on discussions at previous meetings.
  has assigned chuck hutton as designer
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  will talk next week with chuck, get him in contact with designer at FSU
+
  
buy light guide material
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* Repeat resolution measurements with the new components of the set-up, most notably with the absence of spurious peaks in the timing spectra.
  need to pick that up, they are running out
+
* Continue light guide production, and test the various design geometries.
 +
** straight vs. bent
 +
** small vs. large angle of taper
 +
 
 +
He also talked to Tim and reported that Chuck Hutton will be the designer assigned to the TOF. Beni will talk to Chuck next week and try to get Chuck in touch with the designer at FSU.
 +
 
 +
==Light Guide Material==
 +
 
 +
Mark brought up the plan to buy more light guide material for prototyping. This needs to be picked up again.

Latest revision as of 17:12, 24 February 2017

Location, Time

Friday, May 26, 2011
2:00 pm EDT
JLab: CEBAF Center, Room F326

Agenda

  1. Announcements
  2. Minutes from the last meeting
  3. Prototype Status [1]
  4. Contract Status

Communication

Videoconference

  1. ESNet: 8542553
  2. EVO: EVO site

Telephone

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

Slides

Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2011-2Q on the JLab CUE. This directory is accessible from the web at https://halldweb.jlab.org/talks/2011-2Q/ .

Minutes

Present:

  • FSU: Sasha Ostrovidov
  • JLab: Eugene Chudakov, Mark Ito (chair), Elton Smith, Sascha Somov, Simon Taylor, Ivan Tolstukhin, Beni Zihlmann

Status Report from Paul

Paul Eugenio could not join us, but sent in a written report:

We received the VM2000ma from 3M, and I sent 3 sheets to FIU. We also received the VXS crate, and have swapped it into our test system. We discovered that our test counter PMTs were sagging and separating at the light guide. This was due to using a silicon cookie rather than a glued pmt/light guide joint. We have glued all PMTs now, and Sasha is ready to restart tests.

I have two new students joining our tof effort: Aristedis Tsaris and Hussein Al Goul. They have started getting familiar with our test set up, measuring plateaus, efficiencies, and spectra. They are constructing short paddles and will study single pmt readout and coupling of light from bar to bar, but they will now spend a few weeks at JLab for Hugs.

Status Report from Sasha

Sasha reported on several items.

  • The new crate is working well. Now, all modules can be plugged into the single crate with no sag in the power supplies.
  • He showed plots on two topics:
    1. ADC spectrum with Americium source. Paul put together a source/scintillator package that can be used to test PMT's as they arrived. The energy peak is clearly visible.
    2. Troubleshooting multiple timing peak problem. The troublesome multiple peaks seen previously have been eliminated. They were due to very large pulses coming from discharge of the cathode to wrapping material on the trigger phototubes.

Summary of Goals from Beni

Beni went through the near-term goals based on discussions at previous meetings.

  • Repeat resolution measurements with the new components of the set-up, most notably with the absence of spurious peaks in the timing spectra.
  • Continue light guide production, and test the various design geometries.
    • straight vs. bent
    • small vs. large angle of taper

He also talked to Tim and reported that Chuck Hutton will be the designer assigned to the TOF. Beni will talk to Chuck next week and try to get Chuck in touch with the designer at FSU.

Light Guide Material

Mark brought up the plan to buy more light guide material for prototyping. This needs to be picked up again.