MPS Minutes 20220616

MPS meeting minutes – June 16th – 2022

Present:HH, RC, KL, AD, AL, MR, MA, SR, BH Meeting commenced: 10am PT

Meeting adjourned: 10:30am PT

MPS status

• LIC0 trouble shooting
  • EMBD:LIC0 indicated red on "installed" status. Maybe module wasn't seated properly?
  • HH investigated this morning
  • It's fixed but unclear how this happened. Maybe during FLASH update
  • In the future verify epics status for each channel after completing work
• The beam path restrictions are not really set up to make sure BLMs are running. Only checking HV for low-energy section
• Can we implement this now for the medium and high-energy sections? Would this cause issues, when temporarily disabling detectors?
  • Check seated status, Argon, HV, PMT current readback
  • Similar to optics ok, given set of detectors to be turned on. Maybe modification of the run permit
  • Work request
  • Amend document for seated status
  • Calibrations
• Argon flow started yesterday
• Keiko updated signal PV in the alarm handler and archiver for former ELBT:PMT1A now ELBT:LICSP1 (spare channel)

S1 to S2 delay

• the delay between stage 1 trip detection to stage 2 trip has been implemented by HH
• detect mode was fixed at 10us (plus some inherent delay through the FSD and timing system ~5us).
• Delay is adjustable between 1us and 25us. Default is 10us.
• Look for S2 trips. Log how many we get.
• Brandon just started tuning and inserting view screen tripped PMT1B causing S2 trip. Dark current much higher than before shutdown?
• EPICS indications for S1/S2 trips => Ricky to check what is indicated when to avoid confusion on trip vs stage status.

FLASH

• Board modifications complete
• HH thinks the modified board will work for FLASH. Before it can be install, Controls will need to change the conversion factors on

the EPICS screen. Basically all existing conversion need to be increased by 100.

• HH updated user manual.
• Ricky to update the conversion factors.
• FLASH to run next week
• MA: Has the new FLASH board (Reads 920 nA.) been tested with a current source? HH checked in the lab.
• Nothing was changed in the hall
• HH: Old board can be put back easily if needed.

AOB

• Check if we can use EACA conditioning to test fibre. Check if yanyun is doing pulsed conditioning or cw.

Action Items

• AL: Addendum to BLM controls configuration specs document (Document-193864). Add "installed" status.
• AL: submit work request to implement add BLM settings/status to beam path restrictions
• RC: Update conversion factors for FLASH channel
• AL: Finish calibration documents
• RC: Verify displays of S1/S2 are correct