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 30: Line 30:
  
 
=Minutes=
 
=Minutes=
still working on light guides
 
  
from discussions last week, good recommendations
+
Present:
from bent 1/2 inch plate to machine a channel
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* '''FSU''': Sasha Ostrovidov
simplifies  
+
* '''JLab''': Chuck Hutton, Mark Ito (chair), Tim Whitlatch
grab by the light guide only
+
 
  what about pressure from the whole assembly
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==Prototype Status==
flat section .4", 1 cm
+
 
full scale model to see if support
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Sasha working on attaching the light guides to the prototype in a removable manner.
1/4 scale full frame
+
 
aim for tuesday, for next design meeting
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==Mechanical Design==
4 pm mon send out draft drawings
+
 
 +
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

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