July 08, 2021 KLONG Design Meeting
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Meeting Time and Place
Thursday July 08, 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/June_24,_2021_KLONG_Design_Meeting
- Media:KLONG_Be_target_overall.pdf
- Existing PS vacuum chamber 5 cm high, entrance tube 3.5 cm round ID, magnet gap - 7 cm
- Tungsten cooling
- Preliminary 3D Model
- Support/rollers
- Tungsten cooling
- 7 cm tube downstream to allow cooling tubes for tungsten
- Be target holder
- lead geometry
- Borated Poly geometry
- Heat absorbed by Be and Tungsten (.6kw and 6Kw respectively)
- Requirements:
- Cool tungsten plug to below temperature that affects lead (327°C)
- 6 cm beam tube near final target
- Moveable out of beamline
- Be 98% pure or better
Minutes and Action Items
- We discussed the beampipe downstream of the beryllium target. Currently there is a 3.5 cm opening in the pipe going into the Pair Spectrometer magnet. Since the beam spot size on the beryllium is about 4 cm (and enlarges to 6cm by the time it hits the liquid target), the PS vacuum chamber would need to be replaced with a 6cm opening beam pipe and be at least 6 cm downstream of this. The sweep magnet in collimator can stay as is and use 5 cm US of sweep.
- Discussed heat absorption in beryllium and tungsten. Igor has a collaborator (Johan) to do some calculation in about 1 month. In the meantime assume linearly increasing absorption throughout.
- ok to use 98% beryllium
- Discussed cooling of the tungsten. Need to discuss with RadCon about using existing LCW system or a stand alone that keeps the water in the hall.