Meeting 2 April 2021

DISCUSSION ITEMS

• Power deposition/stress calculations

• TCS Updates

• Other

PARTICIPANTS: Bogdan Wojsekthowski, Donal Day, Hamlet Mkrtchyan, Josh Crafts, Tanja Horn, Steven Lassiter, Vardan Tadevosyan, Amy Comer, Arshak Asaturyan, Gabriel Niculescu, Marie Boer

POWER DEPOSITION/STRESS CALCULATIONS (Bogdan, Amy, Steven L.)

• Investigations of stress with simplified model - applied 1kW - found that cuts help in reducing stress

• OPERA (usually used for EM fields) also allows to calculate stress - heat deposition only along z (segmented)

• Full 3D calculations with heat deposition in both z and x/y - requires many elements

• longer cu absorber would be good to better distribute heat (6 kW at end)

• investigate downstream heat distribution in more detail beyond cu

• upstream side: impact of beam missteering

• conjugate heat transfer; cooling efficiency - making good progress with FLUENT calculations

• Actions items:

• finalize stress with all cuts and distributions
• investigate material under radiation - in particular horizontal swelling
• investigate impact of misteering on upstream part - narrow piece, geometry dependent effect
• cross check calculations (Bogdan, Steven)
• absorber design getting close to starting with magnet design
• write design parameters (dump viewer, radiation monitor, etc.)

TCS UPDATES (Vardan)

• Polar angle dependence of rate - study any further reduction in background

• Background seems more concentrated at small polar angles - could reduce background by factor 2 to ~60kHz if cut on polar angle 8 degrees and reduce detection efficiency from 75% to 72%

• Action items

• further investigate timing (<50ns) - for trigger can use pulse rise time 3-5ns
• impact of magnetic field - could collect unpolarized data

NEXT MEETING: FRIDAY 16 APRIL AT 8:00AM ET