General Meeting Summary 5/20/21

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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