General Meeting Summary 10/28/21

PARTICIPANTS: Aaron, Arshak, Charles, Brad, Hamlet, Paulo, Petr, Steven, Tanja, Vardan, Vladimir, Carlos, Fernando, Rolf, Bogdan, Julie

GROUNDING OF NPS (Fernando)

• Agreed on overall scheme in 15 October special meeting (summary: https://wiki.jlab.org/cuawiki/index.php/Special_Meeting_Grounding_Scheme_Summary_9/22/21)

• Detector chassis isolated from any detector structure

• Chassis connected to electronics ground and thick cable that connects to clean ground in hall

• CAD drawing in progress

HV DIVIDER (Fernando)

• Optimized design PCB nearly complete

• Testing the full dynamic range of optimized divider design suggests that need to increase gain

• also requires higher bandwidth - may need to change chip

• Communication with Orsay team on grounding connectors

• CAD drawing with connector position provided - can be considered final

• Recall two options presented by Orsay team:

• fixed wire
• connector

LOW VOLTAGE (Carlos)

• PCB designed and quotes

• expect end of year/early January

• low voltage cables - can be purchased with connector from samtek or flat cable + modify and add connector

• Action: request quote (Fernando) - Orsay needs to provide cable lengths

• Timelines:

• Low voltage cables should be done by beginning January
• Expect HV Dividers to be in hand end of the year to beginning January

DSG UPDATES (Aaron)

• Thermal simulations

• Ambient air temperature determines crystal temperature
• expected load is 0.5W
• very stable at lower heat loads - for 0.5W per crystal
• keeping at 18degC seems a good choice

• Ambient experimental hall temperature typically 20-21 degC

• plan to investigate adding cooling flow and also add wrapping material and investigate additional ambient temperatures
• NPS will have air flow to prevent condensation, but this will be dry air,

• Reflector shaping - made 110 so far, 16% done

• ODU has 500 foils - expects to deliver the first 100 pre-shaped foils in first week of November

MECHANICAL (Paulo)

• much progress with design and procurement of components

• cabling strategy for roof block finalized - present design focus is on sections near beamline, which will determine remaining cabling strategy

ASSEMBLY PREPARATION DISCUSSION

• Need dates when people on site

• first thoughts - end of January/beginning February sounds possible
• vaccination mandatory to travel to US from November 8th - negative Covid test also still needed

• Electronics - good progress with electronics components

• LV PS received and stored

• Expectation: installation NPS in spring/summer 2023, first NPS run in fall 2023

• Start thinking about next collaboration meeting

NEXT MEETING: THURSDAY 2 DECEMBER 2021 AT 9AM ET