General Meeting Summary 8/27/20

PARTICIPANTS: Aaron Brown, Arshak Asaturyan, Alexandre Camsonne, Bogdan Wojtsekhoski, Carlos Munoz-Camacho, Hamlet Mkrtchyan, Marie Boer, Paulo Medeiros, Vardan Tadevosyan, Rolf Ent, Vladimir Berdnikov, Tanja Horn, Charles Hyde, Ho San Ko, Julie Roche, Jacob Murphy, David H

FRAME (Carlos)

• All fibers are cut

• VM2000 reflector sheets have been sent to JLab - received at JLab, located in NPS cleanroom

• currently have two tools are available at JLab - make additional ones to increase efficiency
• total time required for one reflector shaping is ~30 min

• Assembly to test various things

• PCB boards assembly with PMTs and cables and fibers - testing fiber lengths
• Cooling plates with mu metal "frame" at the back (crystals supported in front, but stacked in the back)
• Probes to measure temperature
• Heat exchanger + chillers
• Assembly instructions are being prepared

CABLES (Carlos)

• Orsay set up documentation for cables on Wiki

• Discussion about rating of HV connectors (Samtec)

• S. Wood checking with C. Cuevas on possible local tests
• More recent concerns: some pins/connectors exposed -- solution: interlock system, turn off HV when box is opened (>40V must be interlocked)

• Action Items:

• Add link to DSG on Cables Wiki page
• Check with Steve and Chris on status of HV connector - update at next NPS meeting
• Send updated drawing of frame to Paulo

DSG UPDATE (Aaron)

• HV cable fabrication ongoing and procurement of HV cable component underway

• Voltage stability testing

• Developing EPICS monitoring screens, e.g. environments

• HV rating concerns discussion

• one note: in actual experiment running low current

DESIGN/ENGINEERING (Paulo)

• Ongoing work: Lift fixture, Slide frame

• Released recs: platform, rails, etc.

HV DIVIDERS

• Waiting for work to start at JLab (Fernando's team)

CRYSTALS (Vladimir)

• Crytur crystals arriving every month and have been inspected - all good quality so far

• SICCAS arrived - need to identify 60 crystals for NPS

• Action Item: Keep documentation of crystals by ID

PAC RECAP OF NPS PROPOSALS

• PAC report not yet available - comments below from the public closeout session

• Positron DVCS

• PAC encourages investigation
• currently can only approve with C2 since not all information on beam is available at this time - needed to make allocation of days
• further develop unique physics case for positrons that cannot be reached with additional electron data

• Timelike Compton Scattering

• not yet convinced that experiment is feasible - need more information
• report should have details on the experimental aspects to focus on

NEXT MEETING: THURSDAY 10 SEPTEMBER AT 9AM ET