General Meeting Summary 12/2/21

PARTICIPANTS: Paulo, Brad, Fernando, Vardan, Hakob, Steven, Aaron, Rolf, Carlos, Julie, Tanja, Hamlet, Bogdan, Christine, Vladimir, Marie

NPS PMT HV DIVIDER (Fernando, Vladimir, Chris)

• Tests: laser HV=605V@405uA, amplitude 10% of max

• PCB 2 layer (previous) vs 4 layer+shielded (new) - considerably lower noise for 4 layer

• Max peak amplitude (944mV) within fADC250 1V scale

• Good linearity, wide bandwidth

• slight slope as approaching 10 mHz very likely associated with change in pedestal, not pile up
• linearity < 1%

• Next step: upcoming test to assess detector shielding on baseline noise

• Long lead time 10-12 weeks of HV dividers delays NPS assembly

• takes longer than previously expected - now article arrival in ~March 2022, then still need to do socket assembly and testing
• may be related to global supply shortages
• earliest assembly time for NPS based on this: April 2022
• staged delivery schedule allows for testing incrementally and all assemblies available ~1week after week 12

• Actions:

• carry out remaining tests
• expect to submit procurement within a week

DSG UPDATE (Aaron)

• Reflector shaping ongoing (~55% complete)

• perhaps more space needed
• crystal wrapping - 3 months in 2022

• Optimizing screen development - converted to CSS Phoebus

• includes a temperature map

• Thermal analysis - added further details to the model

• Action: Christine check at ODU on status of reflector pre-shaping

PREASSEMBLY (all)

• check with DSG about crystal wrapping
• make list of preassembly items
• stock room accounts
• room for crystal wrapping (assumed is 126) and storage (clean room?)
• make an editable list of preassembly items

MECHANICAL DESIGN (Paulo)

• mechanical roof block - vendor same as for SHMS

• material largely available (boron), shredded plastic is bottleneck

• beamline - beampipe designs release expected early next week, supports, corrector magnet coil support - a clamp or so

• Next:

• reinforcing target platform
• cable run tray supports

• Action: Paulo follow up with Bogdan on corrector magnet

NEXT MEETING: THURSDAY 16 DECEMBER AT 9AM ET

• Main item: discussion of NPS preassembly/assembly plans