Meeting 12 June 2020

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Discussion items

  • Simulations: updates
  • Shielding and magnet model
  • Hall A/C model and design/implementation
  • Hall D design
  • NPS+CPS experiments
  • Other

PARTICIPANTS: Donal Day, Igor Strakovsky, Josh Crafts, Tanja Horn, Sean Dobbs, Hamlet Mkrtchyan, Gabriel Niculescu, Vardan Tadevosyan, Rolf Ent, Bogdan Wojtsekhowski, Marie Boer, Steven Lassiter



  • Cu Core - was split into two pieces following advice from previous meeting
  • No need to cut symmetrically, one side could be flat
  • Ask Target Group about machining options
  • Cooling of the Cu Core
  • Action Item: Repeat cooling calculation using Josh's model (Gabriel)
  • all cooling in W-Cu area: make flat, rectangular cooling channel outside (on top of) the Cu core (could bolt on or other method) on each side and check
  • investigate optimal cooling by changing fractions of Cu and W-Cu areas used for cooling channels
  • investigation includes both distance and water temperature (<100 degrees to prevent boiling)
  • How to feed water through shield to the core
  • radiation level lowest at rear (upstream) end - could bring in cooling from there
  • services could be nested, slotted, and come in from the side
  • Weight of the bottom shielding structure
  • helpful to keep it modular to crane it in
  • Discussion of questions about magnet:
  • Magnet lifting points: typically designed in for magnet
  • Magnet itself should sit on feet so can do alignment - typically fiducialize offline with a few points
  • poles can be attach to magnet by two lifting points
  • hex, 5/8"-1" as minimum diameter (but magnet only 2 tons total, so maybe 1/2" bolts (x3) might be enough?)
  • Action item: Josh: send step file to Steve Lassiter


  • Beamline simulations completed - beam focused on KLong production target, no benefit for raster upstream as opposed to making beam larger, can increase size to a few cm
  • CPS radiation simulation was sent to Igor - converting to MNCP6 code geometry
  • Action Item: Gabriel send simulation to Sean for cross checking in Geant4 directly


  • Information gathering - investigating different options: purchase 17.5 g/cm3 solid (more expensive) or pressing powder
  • For Be target area to be covered by W is relatively small
  • Lead brick tolerance: ~1/16" typically
  • Can use lead sheets as shims assuming all identical blocks (dimension and uniformity)