General Meeting Summary 6/30/16

MAGNET UDPATE

• Discussion about updated magnet model - ready for detailed design drawings

• "pyramid pipe" fully implemented now. With this pipe there is enough space for iron to keep magnetic field as low as possible
• Not much space between scattering chamber and magnet front, but it fits
• magnet will be located on SHMS carriage, stands are being worked on, HB magnet will be removed whenever sweeping magnet installed

• Final design drawings expected in 3-4 weeks - once ready can send to companies for iron cutting and coil procurement

CABLE MANAGEMENT

• Decision has been made with Hall C for the overall strategy of cable management - patch panels will be at front of SHMS with exact location TBD

• Next steps will include the logistics of where patch panels will be located and how cables will be routed

• Fitting more than ~1000 cables will require a different solution

CRYSTALS

• Tests on PbWO4 are ongoing at CUA and Orsay

PMTs AND HIGH VOLTAGE DIVIDERS

• Work on CW bases ongoing at ODU - expect finalization by beginning of September

MAGNETIC SHIELDING OF PMTS

• Discussion about estimating the effect of polarized target fringe fields

• Jixie will send field map to Hamlet

FRAME AND MECHANICAL DESIGN

• Assumes to use crystals from Hycal with dimensions 2.05 cm x 2.05 cm and PMT (Hamamatsu R4125) assembly with active base designed by Hamlet

• Design drawings have been sent to IPNO, engineers looking at them

TCS WITH NPS

• Discussion about Vardan's acceptance studies

• TCS will use a fixed setup with two NPS-type detectors
• Simulation assumes finite acceptance calorimeters - losing small angle acceptance as moving away from target (see page 5 of Vardan's slides)
• Page 2 shows the target magnetic field in longitudinal configuration, but experiment requires transvere fields - need to check if assumed correct acceptance for the transverse configuration in the simulation, e.g., where coils/openings are located

• Discussion about following up with Thia on photon source meeting

ADMINISTRATIVE

• MRI annual report has been submitted

ITEMS FOR NEXT MEETING:

• Magnet updates

• PMT magnetic shielding update

• Support structure and frame

• Crytals and PMTs

• Cable management update

• Other...

NEXT MEETING: THUR 21 JULY, TIME: 9:00 AM (EDT)