Meeting 4 December 2020

DISCUSSION ITEMS:

• Simulations - parameterization of power deposition

• Shielding and magnet model - check of numbers of modules and analysis of radiation hard coil model

• CPS Design Model Update

• Hall A/C model and design/implementation - thermal model development etc.

• Hall D design and radiation simulations

• Other

PARTICIPANTS: Hamlet Mkrtchyan, Hovanes Egiyan, Josh Crafts, Marie Boer, Steven Lassiter, Vardan Tadevosyan, Tanja Horn, Rolf Ent, Bogdan Wojtsekhowski, Igor Strakovsky

SHIELDING MODEL (Josh)

• Units: US tons

• currently 2109 W blocks (2" x 2" x 4")

• low by factor of two in volume compared to previous estimate

• Total weight ~43 tons (no magnet, no support structure) with ~31 tons of lead and ~10 tons of tungsten powder and ~2 tons of poly sheets

• consistent with previous estimate of <50 tons
• should be ok for Hall C - HallC crane is 20 tons, but another crane can be brought in to move shielding

• side shielding

• Unistrut probably not good enough
• investigating other solutions

• exterior beam pipe dimensions 4"x4" tube

• eventual topics to consider: air, vacuum, etc.

• survey and alignment - transfer fiducials from inside to outside, location of magnet

• e.g. three (minimum) to four pillar platform for magnet
• magnet should be independent of shielding material
• post from bottom to magnet - radiation impact (W pole?), pole can't support weight
• to deal with weight on top need another shelf on top of magnet to transfer weight

• Remaining:

• slice into individual segments for layout
• factor of two less of tungsten currently - need to check
• design team needs to look now at details, e.g. full box, side loads, penetrations, etc.

POWER DEPOSITION (Bogdan)

• Large table being developed for power deposition

• divide volume of absorber into 5cm elements and in and y in 0.5mm
• element, energy deposition in kWatt/cm3

• Method of applying heat load - grid

• seems ok, but need to analyze carefully since structure has many features

• Action:

• need to check units in table and work on format

THERMAL MODELING (Steven, for Amy)

• Good progress with modeling

• Resolved modeling issues and issues with temperature and energy convergence at high temperatures

• Temperature seems close to original estimate

• Action:

• check model with known solution
• continue with model optimization

HALL D Status (Hovanes)

• Working on radiation simulation

• Action: Power depositions - plots post, table

• discussion of alignment of electron beam

• need instrumentation upstream - beam line girder to monitor beam

NEXT MEETING: FRIDAY 18 DECEMBER 2020 AT 8AM ET