June 24, 2021 KLONG Design Meeting

Meeting Time and Place

Thursday June 24, 2021, 1pm Bluejeans https://bluejeans.com/465620466

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

Minutes from last meeting https://halldweb.jlab.org/wiki/index.php/June_10,_2021_KLONG_Design_Meeting
Media:KLONG_Be_target_overall.pdf
Preliminary 3D Model
- Square tubes
- 5 mm gap between Be and tungsten
- 5 cm tube downstream since that is the clearance in sweep magnet
- Be target holder
- lead geometry
- Borated Poly geometry
Heat absorbed by Be and Tungsten
Requirements:
- Cool tungsten plug to below temperature that affects lead

We went through the marked up sketch of overall dimensions and everyone was ok with it.
Discussed beam size and beam pipe size. 5cm beam pipe ok to just past the sweep magnet . Need to check if the PS is 6cm. Will use 6 cm after the sweep.
Moskov said the target is 6 cm so we do not need to be bigger than that.
Keith presented the 3D model
- 6" (15 cm) square steel tube ok upstream of tungsten. This will make it easier to stack lead
- 5mm gap between beryllium and tungsten ok
- Square tungsten to match steel tube ok (6"), Igor will do new calculation when design finalized
- Square steel tube downstream of tungsten plug ok. Tentatively 5 cm, may be bigger if cooling tubes are needed for tungsten
- some type of cradle support for the beryllium ok.
- Vacuum tube (5 cm) to start right after target assy - is kapton window ok or is aluminum needed?
- Verify weight of lead, appears to be 18 tons (Igor's initial estimation was 12.5 t )
- Location of Be within several mm ok
- Assembly will be on rollers and move out of beamline manually
- Hovanes asked if it would be easier to fabricate beryllium if square. This needs to be looked at.
Energy absorption in beryllium and tungsten not yet calculated
Igor requests 16.3 g/cc for tungsten (the source is Rolf, one can check it with Bogdan)