General Meeting Summary 6/30/16
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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)