General Meeting Summary 12/2/21
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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