GlueX Target Meeting, May 17, 2011

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Location, Time

Tuesday, May 17, 2011
1:00 pm EST
JLab: CEBAF Center, Room F224/225

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/ .

Minutes

Present: Hovanes Egiyan, Jim Fochtman, Mark Ito, Chris Keith, Tim Whitatch

• 500 gauss on cold head is max. Is this ok • cool in one shift • average diameter of target: is that OK? needs to be decided • length of target: can this be finalized • Max OD of scattering chamber driven by start counter, CDC in turn • what is alignment requirement for target? • how well do we have to know the density of the liquid

Additional requirements

• quality of scattering chamber vacuum: prevent freezing material on target • flammable gas compatible • interlock nearby electrical systems/ignition sources if target cell ruptures ∘ hydrogen gas sensors will be needed ∘ pressure switch on vacuum chamber • stainless steel tubing • welding whenever possible

P&I

• Tanks outside connect to single line • vent line to go outside hall, manual valve • vacuum pump needs explosion proof motoer

P&I 2

• mount gas panel outside hall, changing gas could be done without access, still manual

Other considerations

• could put gas panel and control electronics in the "target" rack • electronics ∘ temperature controller ∘ nice: local visual read-back for pressure transducers ∘ turbo controller for scattering chamber ∘ vacuum gauge controller • these designs allow automatic transition to gas in cell, but not vacuum

Next frontier

• mechanical design for target condenser, cell, scattering chamber • may not want to have cold head to provide mechanical support • Jim will contact Chris to work out issues before the next meeting

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