Difference between revisions of "GlueX Target Meeting, May 17, 2011"

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(copy of last time)
 
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=Location, Time=
 
=Location, Time=
  
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Tuesday, April 12, 2011<br>
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Tuesday, May 17, 2011<br>
 
1:00 pm EST<br>
 
1:00 pm EST<br>
 
JLab: CEBAF Center, Room F326/327<br>
 
JLab: CEBAF Center, Room F326/327<br>
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=Agenda=
 
=Agenda=
  
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# Review [[GlueX Target Meeting, March 10, 2011#Minutes|minutes from previous meeting]]: all
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# Review [[GlueX Target Meeting, April 12, 2011#Minutes|minutes from previous meeting]]: all
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# Target Mechanical Design: Tim, Chris
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# Target Work Reports: all
 
# MOU status: Mark
 
# MOU status: Mark
  
 
=Communication=
 
=Communication=
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==Video Conferencing==
 
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* ESNet: 8542553
 
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* [http://evo.caltech.edu/ EVO]:
 
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** Meeting URL: http://evo.caltech.edu/evoNext/koala.jnlp?meeting=vsvivIe8eIItIvasatItas
 
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** Phone Bridge ID: 322 6191
 
  
 
==Telephone==
 
==Telephone==
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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/ .
 
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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=Minutes=
 
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Present: Hovanes Egiyan, Mark Ito, Chris Keith, Rory Miskimen, Tim Whitlatch (chair), Elliott Wolin
 
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* Tim brought along drawings and notes made two years ago, modeled on the Hall B cryotarget.
 
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** We may need to pick Steve Christo's brain, especially about lessons learned in Hall B.
 
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** The Hall B targets are Kapton, with DP190 epoxy joining the seams. The scattering chambers are made of Rohacell.
 
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** We will have to perform pressure tests on the cells. Current code may be more stringent than standards at the time the Hall B targets were commissioned.
 
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* The refrigerator will be bought in October or November.
 
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** The model being considered can liquify hydrogen starting from room temperature, at about a liter per hour, corresponding to 15 watts at 20 K. Liquid hydrogen volume looks to be of order a liter. Helium-4 will take longer to liquify.
 
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** The requirement that we want to be able to empty/fill the target on the time-scale of a few hours (preferably less) was restated.
 
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** The refrigerator have no cold moving parts.
 
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* We will have to design and build the heat exchanger and heating element. The refrigerator will stay on continuously and temperature of the hydrogen controlled with a heater in the cold head.
 
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* The gas panel can probably copied from that used by Q-Weak.
 
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* Mechanical considerations
 
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** The target, its plumbing, and the refrigerator (including cold head) will all be a "rigid body". Adjustment of the position of the target on the beam line will be accomplished by positioning the entire structure.
 
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=Items for the Next Meeting=
 
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* Chris will create a P&I diagram for the gas/refrigerator system
 
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* Chris will distribute the manual for the refrigerator so others can get started thinking about the relevant controls and monitoring.
 
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* We will invite Steve to the next meeting.
 
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* Next meeting in about a month.
 

Revision as of 17:31, 14 May 2011

Location, Time

Tuesday, May 17, 2011
1:00 pm EST
JLab: CEBAF Center, Room F326/327

Agenda

  1. Review minutes from previous meeting: all
  2. Target Work Reports: all
  3. MOU status: Mark

Communication

Telephone

To connect by telephone:

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

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/ .

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