Difference between revisions of "GlueX TOF Meeting, March 15, 2012"

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==Slides==
 
==Slides==
  
−
Talks can be deposited in the directory <code>/group/halld/www/halldweb1/html/talks/2012-1Q</code> on the JLab CUE. This directory is accessible from the web at https://halldweb1.jlab.org/talks/2012-1Q/ .
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Talks can be deposited in the directory <code>/group/halld/www/halldweb/html/talks/2012-1Q</code> on the JLab CUE. This directory is accessible from the web at https://halldweb.jlab.org/talks/2012-1Q/ .
  
 
==Chairman's Cell Phone==
 
==Chairman's Cell Phone==
Line 44: Line 44:
  
 
* The main support structure has been changed from a bent 1/2-inch plate to machined U-channel, where the basic stock is a standard item. This simplifies the manufacturing considerably, reducing it to machining one edge and possible straightening.
 
* The main support structure has been changed from a bent 1/2-inch plate to machined U-channel, where the basic stock is a standard item. This simplifies the manufacturing considerably, reducing it to machining one edge and possible straightening.
−
* Mark reported the concern about avoiding putting pressure on the scintillator to prevent crazing. This would mean support by the light guide only. Tim pointed out that there might be significant stresses on the scintillator even then and wondered if that was a worry. Mark agreed to look into this.
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* Mark reported Elton's concern about avoiding putting pressure on the scintillator to prevent crazing. This would mean support by the light guide only.
−
grab by the light guide only
+
** Tim pointed out that there might be significant stresses on the scintillator even then and wondered if that was a worry. Mark agreed to look into this.
−
  what about pressure from the whole assembly
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** Chuck was concerned that the flat section of the light guide next to the scintillator was a bit narrow to be used to support the entire module, given other tolerances that might move the support area. The flat section is only about 1 cm wide.
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flat section .4", 1 cm
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* Tim brought re-raised the idea of scale models
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full scale model to see if support
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** a full-scale model of a corner of the array as Paul suggested last time
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1/4 scale full frame
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** a 1/4-scale of the entire assembly, to look for assembly/installation problems
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aim for tuesday, for next design meeting
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** If the FSU Physics machine shop is available for this kind of work, then there are huge cost savings.
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4 pm mon send out draft drawings
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* We will aim for another design meeting on Tuesday, March 20. Mark will try to set it up.
  
 
==Action Items==
 
==Action Items==
  
 
* Look into issue of avoiding pressure on the scintillator. -> Mark
 
* Look into issue of avoiding pressure on the scintillator. -> Mark
 +
* Set up next design meeting. -> Mark

Latest revision as of 00:14, 1 April 2015

Thursday, March 15, 2012
10:00 am EST
JLab: ARC, Room 428

Agenda

  1. Announcements
  2. Minutes from the last meeting
  3. Mechanical design: Tim, Chuck
  4. Prototype status: Paul, Sasha
  5. TDC choice: all
  6. Contract Status: Mark, Paul
  7. Calibration and Alignment discussion.

Communication

Videoconference

  1. ESNet: 8542553
  2. EVO: EVO site

Slides

Talks can be deposited in the directory /group/halld/www/halldweb/html/talks/2012-1Q on the JLab CUE. This directory is accessible from the web at https://halldweb.jlab.org/talks/2012-1Q/ .

Chairman's Cell Phone

(757)504-0664.

Minutes

Present:

  • FSU: Sasha Ostrovidov
  • JLab: Chuck Hutton, Mark Ito (chair), Tim Whitlatch

Prototype Status

Sasha working on attaching the light guides to the prototype in a removable manner.

Mechanical Design

Tim and Chuck have been working on changes from discussions at the last meeting. He remarked that good recommendations were offered by the FSU team.

  • The main support structure has been changed from a bent 1/2-inch plate to machined U-channel, where the basic stock is a standard item. This simplifies the manufacturing considerably, reducing it to machining one edge and possible straightening.
  • Mark reported Elton's concern about avoiding putting pressure on the scintillator to prevent crazing. This would mean support by the light guide only.
    • Tim pointed out that there might be significant stresses on the scintillator even then and wondered if that was a worry. Mark agreed to look into this.
    • Chuck was concerned that the flat section of the light guide next to the scintillator was a bit narrow to be used to support the entire module, given other tolerances that might move the support area. The flat section is only about 1 cm wide.
  • Tim brought re-raised the idea of scale models
    • a full-scale model of a corner of the array as Paul suggested last time
    • a 1/4-scale of the entire assembly, to look for assembly/installation problems
    • If the FSU Physics machine shop is available for this kind of work, then there are huge cost savings.
  • We will aim for another design meeting on Tuesday, March 20. Mark will try to set it up.

Action Items

  • Look into issue of avoiding pressure on the scintillator. -> Mark
  • Set up next design meeting. -> Mark
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