Meeting 30 July 2021

DISCUSSION ITEMS

• Rotating target updates

• Design models, stress/thermal calculations

• Engineering analysis and planning

• TCS updates

• Transverse polarized TCS Brannon Semp (VT) single & double spin asymmetries for TCS

• Other

PARTICIPANTS: Amy Comer, Bert Metzger, Bogdan Wojtsekhowski, Brannon Semp, Dustin Keller, Rolf Ent, Hamlet Mkrtchyan, Josh Crafts, Kevin, Marie Boer, Vardan Tadevosyan, Tanja Horn

DESIGN/ENGINEERING (Amy, Bert, Bogdan, Gabriel, Josh)

• Cooling system work ongoing

• Power deposition along z has been updated

• Testing part of absorber

• Materials

• First tungsten powder blocks for inner part of magnet arrived

• Checking on sintered (still have to shim) tungsten blocks - cost increased over years - need to look into optimization of shielding (main focus on front since most radiation there), dimensions roughly ~3"x(4-5)"x6"

• Change of procurement plan

• initially hoped that get magnet out for procurement, but will still take
• move towards tungsten and start procurement of high density tungsten blocks (16 g/cm3) for center region ~20% of blocks needed

• Action items:

• Check on number of tungsten blocks needed - with 16 g/cm3 and for earlier block size (2 x 4 x 4) assumption ~19.4 (metric) tons
• Start the procurement for the inner part of the shielding

• From later discussion on Tungsten bricks:

• 19.43 metric tons or ~2109 bricks of 2 x 4 x 4
• For the larger bricks of Elmet of 3" x 4.125" x 6.2" that would be ~880.

ROTATING TARGET UPDATE (Dustin)

• Two design options

• standard - limited to one cup, likely will require frequent changes of bellows (quantify)
• new - can take more than one cup, design to optimize bellow wear

• Standard prototype has been built - still needs to be tested (cool down and in beam at NIST)

• New design does not yet have a prototype

• Action item: further develop a plan toward realizing a rotating target for the experiments

TCS TRANSVERSE POLARIZED (Brannon)

• Additional science that could be done within the time of the current C2 approved TCS proposal

• Need to check rates and backgrounds etc.

• Action items:

• focus on removing C2 conditional on TCS proposal first - aim for completing in next four months
• evaluate experimental details of new science in 2022

NEXT MEETING: FRIDAY 27 AUGUST AT 8AM ET