September 2, 2021 KLONG Design Meeting

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Meeting Time and Place

Thursday September 2, 2021, 1pm Bluejeans https://bluejeans.com/465620466

  • Present - Hovanes Egiyan, Moskov Amaryan, Stephanie Worthington, Keith Harding, Igor Strakovsky, Tim Whitlatch, Mark Stevens

Agenda

  • Minutes from last meeting https://halldweb.jlab.org/wiki/index.php/August_19,_2021_KLONG_Design_Meeting
  • Beryllium sealing
  • Poly compression
  • Preliminary 3D Model
    • Collimator Cave Beamline
  • Heat absorbed by Be and Tungsten (.6kw and 6Kw respectively)
  • Requirements:
    • Cool tungsten plug to below temperature that affects lead (327°C)
    • 5 cm beam tube to PS and 6 cm to final target
    • Moveable out of beamline
    • Be 98% pure or better

Minutes and Action Items

  • Looking at 3D model of collimator cave. The 2 partial shield walls should have 10 cm lead on the downstream face of the concrete
  • discussed using 6 cm beampipe through wall at the mouth of the collimator cave. Need to make sure we can fit this.
  • decided to use aluminum windows to isolate the vacuum in the beamline. 250 microns ok
  • 10 cm distance from beryllium target to downstream vacuum window of.
  • we will need to remove the vacuum chamber from the pair spec magnet and replace with a 6cm beam pipe
  • use 5mm gap between beryllium and tungsten
  • Received quotes for $28K and $11K for 98% pure beryllium, ok to use as little as 90% pure, will seek an additional quote
  • need to look at thermal conductivity of whatever beryllium alloy is used
  • Moskov asked if we should plan for 24 GeV beam requirement. Eugene thought this should be treated separately.

Action Items

  • Look at strength and deflection of base structure - Tim
  • Check to see if 6 cm pipe can fit through the shield wall at the collimator cave - Keith, Tim
  • Check overall dimensions of the collimator cave to compare to 3D model - Keith
  • Get Quote for 90% beryllium - Tim
  • Continue working on collimator cave 3D model - Keith