Difference between revisions of "GlueX Target Meeting, April 12, 2011"

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(notes as minutes)
(→‎Minutes: intermediate)
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=Minutes=
 
=Minutes=
  
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target meeting minutes
+
Present: Hovanes Egiyan, Mark Ito, Chris Keith, Rory Miskimen, Tim Whitlatch (chair), Elliott Wolin
  
−
• notes as minutes
+
* Tim brought along drawings and notes made two years ago, modeled on the Hall B cryotarget.
−
• present
+
** We may need to pick Steve Christo's brain, especially about lessons learned in Hall B.
−
• Touch up the notes
+
** The Hall B targets are Kapton, with DP190 epoxy joining the seams. The scattering chambers are made of Rohacell.
−
 
+
** 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.
−
Notes
+
* The refrigerator will be bought in October or November.
−
 
+
** 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.
−
Present: Hovanes Egiyan, Mark Ito, Chris Keith, Rory Miskimen, Tim Whitlatch (chair), Elliott Wolin
+
** 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.
 +
** The refrigerator have no cold moving parts.
 +
* 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.
 +
* The gas panel can probably copied from that used by Q-Weak.
  
−
construction plans were made two years ago
 
−
may need to pick steve's brain, lessons learned
 
−
kapton for most of hall b, dp190 epoxy
 
−
scattering chamber rohacell
 
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tests on kapton
 
−
no grandfather clause
 
−
must be built according to code
 
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must be tested since design will not fulfill code on its face
 
−
• cell
 
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• vacuum chamber
 
−
• refrigerator
 
−
• cryo system
 
−
refrigerator will be bought oct or nov
 
−
liq hydrogen, 1 liter per hour
 
−
15 watts at 20 K
 
−
we must design and build heat exchanger
 
−
no cold moving parts
 
−
helium 4 will take longer to liquify
 
 
probably copy the q-weak gas panel
 
probably copy the q-weak gas panel
 
P&I diagram for gas/hydrogen system
 
P&I diagram for gas/hydrogen system
−
want to be able to empty/fill the target on hour-type time-scale
 
 
temperature control heater probably on the compressor
 
temperature control heater probably on the compressor
 
mechanical
 
mechanical

Revision as of 16:09, 12 April 2011

Location, Time

Tuesday, March 10, 2011
1:00 pm EST
JLab: CEBAF Center, Room F326/327

Agenda

  1. Review minutes from previous meeting: all
  2. Target Mechanical Design: Tim, Chris
  3. MOU status: Mark

Communication

Video Conferencing

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/ .

Minutes

Present: Hovanes Egiyan, Mark Ito, Chris Keith, Rory Miskimen, Tim Whitlatch (chair), Elliott Wolin

  • Tim brought along drawings and notes made two years ago, modeled on the Hall B cryotarget.
    • We may need to pick Steve Christo's brain, especially about lessons learned in Hall B.
    • The Hall B targets are Kapton, with DP190 epoxy joining the seams. The scattering chambers are made of Rohacell.
    • 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.
  • The refrigerator will be bought in October or November.
    • 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.
    • 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.
    • The refrigerator have no cold moving parts.
  • 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.
  • The gas panel can probably copied from that used by Q-Weak.

probably copy the q-weak gas panel P&I diagram for gas/hydrogen system temperature control heater probably on the compressor mechanical target attached to a flange upstream, and that attached to cold head, etc. get manual from Chris get Steve for next meeting

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