Meeting 8 May 2020

DISCUSSION POINTS

• Simulations conclusions, updates, and next phase

• Conclusions and next phase
• Radiation Simulations Update

• Shielding and magnet model CAD (Josh)

• CPS Initial Design Model

• Hall A/C model and design/implementation (Steven, Mike, Paulo)

• NPS+CPS experiments

• Other

PARTICIPANTS: Hamlet Mkrtchyan, Igor, Mike Fowler, Sean Dobbs, Tanja Horn, Paulo Medeiros, Mike CAD, Steven Lassiter, Vardan Tadevosyan, Vladimir Berdnikov, Marie Boer, Rolf Ent, Gabriel Niculescu, Dustin Keller, Donal Day, A Comer

SUMMARY NOTES

RADIATION SIMULATIONS UPDATE (Gabriel)

• Conclusion: we are "there" - Picked configuration mk_V

• No need for pink plastic in front - keep lead there
• Air in exit channel - important to pump, since would give radiological gases
• Need gate valve and window to separate scattering chamber from beam line (simulation has entrance window)

CONCLUSIONS: BRIDGING SIMULATION AND MECHANICAL DESIGN (Rolf, Josh, Tanja)

SUMMARY OF CONCLUSIONS AND SHIELDING SKETCHES

• Listing of radiation and material for mk_V

• Seems to suggest ~50 ton device

• Sketches of shielding configuration: side view, front view (how many bricks there are and how to stack them) - start at z=+5cm and estimate total height (155cm), width (180cm) and length (~200cm)

• Hall D KLong possible configuration

• Position magnet with respect to beam - narrow beam pipe hole (3mm), so need very accurate positioning

• Perhaps change beam pipe to have tolerance on all sides
• Mainly need good beam position - need to be able to align to better than 1mm

INITIAL CAD MODEL OF MAGNET AND SHIELDING

• Magnet pole piece is angled to increase the field

• Note: no field clamp needed for CPS magnet

• Shielding model is still simplified - see action items below

• Next steps:

• Need to also take into account the assembly - which piece goes in first, plus:

• cooling, forces, services to magnet etc.
• outer containment for tungsten and poly - container to hold tungsten (stainless steel typically since it is heavy)

• Division of W-Cu insert should minimize heat transfer between segments
• Discussion of best way to interface with engineering/design team

• Autodesk Inventor - should be able to transfer files

• Action Items - to address before turning over to engineering/design team

• Cu-W inserts
• Form of W blocks - get information from vendor
• Container for W blocks

CPS IN HALL C MODEL PRESENTATION (Mike)

• Discussion of the Hall C model including the CPS

• There are interferences - need to further discuss

• Action item: make ppt slides with screen shots - DONE (see link under Discussion items)

NPS+CPS EXPERIMENTS (Marie, Dustin, Vardan)

• Ongoing simulation efforts

• Background studies with pi+/pi- generator

• Plan to run several settings to optimize signal/background

NEXT MEETING: FRIDAY 29 MAY AT 11:00AM (ET)