MPS Minutes 20210520

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Present: MA, HH, KL, MR, RN, RC, AD, AL (recorder)

Second stage trip

  • HH fixed issue with dumping the data
  • Question regarding the following scenario: If we are running normally and someone hits the stop button for analysis. When the trip happens, the stop is bypassed. -> We should clear when jumping to stage 2.
  • Logistics: Do we scan the status register all the time? This would be required to not get out of synch.
  • RN: This is Intractable 2 masters problem as bit can be set by EPICS or firmware.
  • EPICS should reset bit as soon as status change is detected?
  • MR: We should be constantly scanning already.
  • Second failure scenario for which response needs clarification: If we get a trip condition and everything is connected, however, the FSD or timing system does not send a trip? What if external trip signal is not send?
  • Then we would not go to stage 2 and we do not trip HV
  • MR: This scenario could happen if the cable between FSD breakout board going into event receiver is disconnected or malfunctioning.
  • FSD goes to RF switch AND event receiver.
  • After stage 1 trip we should add a timer (~15us wait should be sufficient), i.e., if no response is received, system should trip.
  • These 2 problems are the last issues HH needs to resolve, then upgrade should be finished.

BLM HV trip (iseg)

  • Issue with BLM tripping during post-mortem test was never resolved.
  • No repsonse from iseg
  • We can try swapping the boards and see if trip still happens
  • Swap boards and addresses, then re-test
  • HH: Is there dial option on modules?
  • MR/AD: This needs change in IOC shell. HH to confirm.
  • Spare modules available? 12-16 channel modules purchase for ARIEL?

E-hall work

  • AL, MA finished re-routing high-energy cables and HH shortened and terminated cables on Tuesday, which took about 6hrs. Labels were attached
  • AL to attach new labels on roof. Also for LEDs. AL to send HH list with required labels after meeting.
  • MA, AL to finish Ar connections next Tuesday and get leak detector from Rick.

Fibre

  • MA to do baseline tests next week

LED calibration

  • AL to write sequence of operation as base for EPICS implementation.
  • Parallel ramp up of all LEDs with PMTs at voltage
  • Compare detector response to reference and set tolerance.
  • Make LED output vs detector response graphs

AOB

  • RN: Are there blanking panels on MPS crate? -> Does not seem to be the case. We should get some.