GlueX Target Meeting, May 17, 2011
Location, Time
Tuesday, May 17, 2011
1:00 pm EST
JLab: CEBAF Center, Room F224/225
Agenda
- Review minutes from previous meeting: all
- Target Work Reports: all
- Target Requirements Target Requirements Target Layout
- Target P&I Diagrams
- MOU status: Mark
Communication
Telephone
To connect by telephone:
- dial:
- US and Canada: (866)740-1260 (toll free)
- International: (303)248-0285 (toll call) or look up toll-free number at http://www.readytalk.com/intl
- 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