General Meeting Summary 4/29/21

PARTICIPATNS: Aaron Brown, Alexander Somov, Arshak Asaturyan, Brad Sawatzky, Carlos Munoz-Camacho, Carlos Yero, Bogdan Wojsekhowski, Rolf Ent, Hakob Voskanyan, Hamlet Mkrtchyan, Julie Roche, Paulo Medeiros, Stephen Wood, Steven Lassiter, Vardan Tadevosyan, Vladimir Berdnikov

ANODE CURRENT MEASUREMENTS (Vladimir)

• Ongoing work: design a new divider with the changes observed so far and with a new, externally powered amplifier

• Design new divider
• Prototyping
• Finalize production by June
• Connection divider to socket and testing
• Impact of magnetic field on low HV PMT - no difference to before since main impact is distance to first dynode and that does not change.

• Brief update on linearity measurements

• Action Items

• Prepare a summary of studies and optimized divider design based on them at the next meeting including

DSG UPDATES (Aaron)

• HV Supply switching tests - all cables and connectors perform well so far

• Hardware Interlock system program and interfaces in development

MECHANICAL DESIGN/ENGINEERING (Paulo)

• Detector cart out for procurement

• Joints for platform installation given to work coordinator

• Will start welding to SHMS soon

• cable routing plan - ongoing activity

SUPPORT HARDWARE (Brad)

• Fast Electronics Group

• Samtec connector certification - procedure developed - results will go into OSP

• testing a few more components

CRYSTALS (Vladimir, Alex S.)

• Crytur

• crystals arrive in small batches each month - visual inspection looks good
• more crystals grown with new raw material arrived - no obvious difference to previous crystals

• old raw material: purchased from BTCP premixed by Giessen U. and has been used for NPS crystals so far
• new raw material: purchased by Crytur from a Russian vendor (Neochem)

• planning to test new vs. old raw material crystals with prototype in beam

• Hall D experiences delays with Siccas

• problems with Pb oxide powder
• so far received 300 out of ~900 crystals that were due at beginning of the year

• Action items:

• impact of one layer SICCAS on NPS resolution? - Carlos will check with Ho-San on available MC samples (idea: smear energy of existing output file and re-run clustering and missing mass reconstruction)
• stacking strategy decision (depends on first item)

• review options in the NPS tasklist

NEXT MEETING: THURSDAY MAY 20 AT 9:00AM ET