General Meeting Summary 6/17/21

PARTICIPANTS: Aaron Brown, Fernando Barbosa, Bogdan Wojtsekhowski, Brannon Semp, Camille Z., Carlos Munoz-Camacho, Charles Hyde, Rolf Ent, Hamlet Mkrtchyan, Marie Boer, Paulo Medeiros, Stephen Wood, Stephen Lassiter, Vardan Tadevosyan, Tanja Horn, Alexandre Camsonne, Vladimir Berdnikov

ACTIVE HV DIVIDER (Fernando)

• Tests show signal 1 GeV equivalent

• Copper tape and ground significantly improves noise

• Need likely PMT shielding and ground

• shielding by itself will not be sufficient
• in detector would need to ground mu metal shielding (tabs with wires) - need to decide if temporary or permanent design

• Low voltage distribution

• new prototype with x10 preamp being prepared

• Overall a complex modification as detector box space very limited

• A possible alternative: use existing pin from Samtec connection - requires new cables though

• Actions:

• Scheme for PMT shield+ground and LV cable layout model
  • figure out best way for low voltage distribution (e.g., quadrants)
  • address question: Use 2 or 4 D-sub 37 connectors/PCB?
  • Design LV distribution PCB
• Full test of new prototypes and assembly of sockets

• Design currently AC coupled - could be DC coupled too

• Note that fADC is DC coupled
• In past have observed baseline drifts for DC, e.g., due to temperature - for fADC doesn't matter much since taken into account in algorithms
• DC coupled may be preferrable

• Timeline estimate

• by end of July should have good understanding of new design
• production: ~2 month from start to finish
• early October have all units and then need to assemble all sockets
• estimate: done in December

• NPS could be installed late 2022 - could run in 2023

all assembled in place, then moved to Hall C as one unit (like ComCal)

DSG UPDATES (Aaron)

• Much progress!

• HV supply cable fabrication done

• HV supply cable testing is ongoing

• Labview Keysight Scanning program development - code development and testing

• crystal zone sensors
• hardware protection - interlock system
• temperature map

MECHANICAL UPDATE (Stephen L., Paulo)

• Detector carriage - two components: detector + cable cart

• Detector carriage in procurement
• Cable cart design - certifications pending

• Work with welding support brackets ongoing

• Support structure that attaches to SHMS, e.g., staircase, platform

• certifications ongoing

• Action: post images of detector carriage, etc.

QUESTIONS ON POWER SUPPLY FOR NPS MAGNET

• How high need to go? reversal switch needed?

• PSU with current greater than 1,100A for some overhead
• No need for polarity reversal switch

• See magnet parameter documentation here: Link

NEXT MEETING: THURSDAY 15 JULY AT 9AM ET