MPSMinutes 20210520

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?

Ehall 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.