GlueX Target Design Mtg, April 12, 2013

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Present: Dave Meekins, Jim Fochtman, Mark Ito, Chris Keith, Tim Whitlatch, James Brock, Josh Pierce, Dave Butler

Agenda

  • Review notes from last week


Notes from last week

  • Discussed Gas system status, vacuum system, cell and scattering chamber and tasks to be done. The following are the results of the discussion;
    • Procurement of gas system components started. Still need piping and relief valves. $40-50K, some components have arrived
    • Tank may be smaller than originally thought and may be located on the insertion cart
    • May put valve on tank to purge to vent system
    • Gas panel work going well
    • Need to determine location for temp purge tank?
    • Jim to talk with facilities on vent stack location
    • Plan to use 20' x 1.5 inch flex line to allow target to be moved in and out of the detector
    • lakeshore boxes from target group are in PLC controls ordered and some have arrived. Dave ordered remaining controls/cables?
    • Looks like a heat exchanger using LCW/Chilled water most economical for refrig. compressor. Jim working this
    • Jim to get with Chris and James on scattering chamber design (some ideas in work) (<15Psig).
    • Tim ordered vacuum system pump cube (Pfeifer turbo cube). Still need to order gauging.
    • Chris sent out list of all items needed for monitoring/controlling from PLC system
    • Hall D people to discuss what needs to be shut off in hall when target vacuum goes south
    • Jim to develop H2 vent details
    • Insertion cart can be extended upstream 18-24" to get panel and turbo in lower mag field. Jim to finalize design with target group.
    • One target cell is made, will need to make two more
    • Josh/James have ideas to develop heat shield and work out cold head weight limits. Jim to work with them on the design
    • Chris working on PLC algorithm and "empty target/fill target" procedure.
    • FMEA needed. Cannot rely on PLC for personnel safety. Use safety pressure switches to turn off/close vacuum valves, power to compressor and heater.
    • Pressurization to failure has been done on individual components. Dave does not believe we need to do the entire system to failure. 2nd DA agreement needed.
    • Heater on return line had little effect on enhancing convection - not needed
    • need heater on supply line to boil off liquid. It took 3 days to boil off neon from cell.
    • If heaters used, need controls
    • Plan on internal review this June
    • Cell was tested vertically. There is no plan to test horizontally until production components are fabricated.
    • Question came up if UPS power is required for any components. Maybe not if relays shut off compressor if power goes out.
    • need to review interlocks on P&I
    • All need to read Dave M. SOW and comment back to him.