September 2, 2021 KLONG Design Meeting

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