General Meeting Summary 9/9/21

PARTICIPANTS: Aaron Arshak, Bogdan, Carlos, Hamlet, Paulo, Tanja, Peter, Emmanuel, Steven, Vardan, Vladimir, Julie, Marie, Rolf, Alex

HV DIVIDERS

• All dividers and PMTs have shipped from Ohio U. and have been received at JLab

• All tests have been completed from NPS collaboration

• Action item:

• define next steps, Fernando test etc.

LV CABLING STRATEGY

• Need to take a decision now to make progress

• Action item: schedule dedicated meeting with Fernando in the week of September 13th (before 11am ET) to decide on the path forward

• Participants: Bogdan, IJCLab-Orsay, Vladimir, ....

DSG UPDATES

• Graphical interface development EPICS temperature screens

• sensors are included at front and back

• Thermal analysis: 3x3 unit with with copper shell at constant temperature 10degC, added carbon fiber around individual blocks, applied heat of 0.5W from back

• temperature profile back to front looks very similar
• temperature profile lateral is different crystal to crystal - change between blocks: min~10, max~11.7degC

• Discussion why there is a change in temperature profile lateral (the outer crystals) from back to front

• There may be gaps between crystals in the model - this would effectively make the inner crystal thermally isolated -- need to check

• Note: important for the experiment is the temperature variation crystal to crystal - don't want different light yield crystal to crystal

• light yield change 2%/degC
• ideally want sub-degree variation

• Database being created of all NPS plots, e.g., CAEN model tests, HV supply tests, etc.

• Actions:

• Check on air gaps in the model
• Thermal analysi of the full (36x31) NPS assembly

PRESHAPING ACTIVITY

• 2-3 people from DSG will participate

• currently have available 4 jigs - will produce 6 more

• ODU tech will help too

• provided 6 jigs and 500 foils
• start with 30-40 foils then quality check

• Action item:

• work our arrangement for pre-shaping activity space at JLab
• Produce additional 6 jigs
• Check in on ODU progress

MECHANICAL

• Work ongoing, e.g., detector lift fixture, cables, etc.

CRYSTALS

• Have been receiving ~40 crystals/month from CRYTUR

• all good quality
• most of them now with the "new" raw material (available from vendor instead of using the raw material from Giessen U.)

NEXT MEETING: THURSDAY 30 SEPTEMBER AT 9AM ET