General Meeting Summary 5/20/21

PARTICIPANTS: Aaron Brown, Alexandre Camsonne, Arshak Asaturyan, Fernando Barbosa, Bogdan Wojtsekhowski, Brad Sawatzky, Carlos Munoz-Camacho, Carlos Yero, David Hamilton, Rolf Ent, Stephen Wood, Hamlet Mkrtchyan, Steven Lassiter, Tristan Anderson, Vardan Tadevosyan, Vladimir Berdnikov, Tanja Horn,

HV DIVIDER UPDATES (Fernando)

• New divider design has 5% of maximum anode current

• Amplification for 1V fADC250 scale is x15 (100mW/channel)

• Power supplies:

• high voltage supplies and boards remain, but need extra low voltage supplies
• Specifics for low voltage PS: need MPV8008LI (37-pin D-sub, 5A max per channel). Will need two (2) plus a spare (lead time 6 months) plus chassis and controller
• 2 cable assemblies per module
• implementation on detector level necessary - action item: need to figure out cable routing in the detector box

• Can amplifiers be put separate and outside the detector box?

• noise is a major consideration

• PMT socket reuse

• will be reused
• ship all from OU to JLab

• Actions and approximate timeframe:

• Finalize test divider, e.g., check potential at all electrodes to see if any adjustments and then measure signal amplitudes etc., and design (~ 2 weeks)
• Produce small batch and test (~2 weeks)
• aim for production in July - simple board to put together (~1 month)
• aim to be ready in September/October
• Figure out how to connect low voltage PS

DSG UPDATES (Aaron)

• Long term HV supply cable testing - some issues identified:

• readback current higher than expected - may need to do some module recalibration
• module channel cannot reach current - cables are fine

• Sensor scanning system development

• Hardware interlock system

• need to order a few additional items (humidity sensors, cable assemblies)

DESIGN/ENGINEERING (Steven)

• Cable box behind calorimeter box on order

• Cable layout - work in progress

• Action: circulate image of cable box

CRYSTALS

• Crytur ~ 860 crystals available at present (+100 university). On track to reach goal by end of the FY

• Crystal stacking: Julie and team are evaluating the configurations with SICCAS crystals on outside and CRYTUR inside

VISITS TO JLAB IN SUMMER AND FALL

• JLab currently still in Medcon5: no new students, experts only, but anticipate policy modifications as overall conditions in VA and US improve

• Action: all (external) teams send information about when visits are planned and as specific as possible the planned tasks to Steve (saw@jlab.org)

NEXT MEETING: THURSDAY 17 JUNE AT 9AM ET