MPS Minutes 20210825: Difference between revisions

From MPS Wiki
Jump to navigation Jump to search
Line 14: Line 14:
**We shouldn't sacrifice safety for convenience and just bump up thresholds
**We shouldn't sacrifice safety for convenience and just bump up thresholds
**Rod: This requires well specified changes
**Rod: This requires well specified changes
**In principle single channel can be disabled. Just have viewscreen status as trigger.
**Rod: Option for more detectors to discriminate between de-focused and focused spills? Might be to complicated for immediate solution.
**Rod: Option for more detectors to discriminate between de-focused and focused spills? Might be to complicated for immediate solution.
**Threshold settings depending on mode of operation? Need to discuss with Thomas.
**Should we have threshold settings depending on mode of operation? Need to discuss with Thomas.
**MA: Does cyclotron have monitors that are getting disabled from time to time? --> Unclear.


==E-LINAC status==
==E-LINAC status==

Revision as of 18:50, 25 August 2021

Present: MA, HH, RN, AD, MR, KL, AL

Commissioning status

  • Finished scans in medium energy section
  • Initial issues with EMBT:MB0 power supply stopped us from taking scan the week before
  • Taking scans at EINJ setpoint 950 - 975 ~10.5 MeV
    • Higher EINJ setting increased dark current by factor of ~3. Spill levels in medium section ~factor of 2-3 higher compared to 2020 data. In high energy section as well.
    • Still need to take dark current scan to add background to thresholds
    • Should also have a study of energy dependence and dark current
  • 10kW was reached at 25MeV (EINJ setting ~710). No issue with BLMs tripping
  • Problem really mostly with tuning procedure when beam is on view screens
    • Is there a way one could implement interlock procedure that disables a particular detector when specific view screen is inserted and re-enables when the view screen is out of the beamline again?
    • Presently, we're tripping when on view screens as beam is spilled and trip settings are for well-focused beam.
    • We shouldn't sacrifice safety for convenience and just bump up thresholds
    • Rod: This requires well specified changes
    • In principle single channel can be disabled. Just have viewscreen status as trigger.
    • Rod: Option for more detectors to discriminate between de-focused and focused spills? Might be to complicated for immediate solution.
    • Should we have threshold settings depending on mode of operation? Need to discuss with Thomas.
    • MA: Does cyclotron have monitors that are getting disabled from time to time? --> Unclear.

E-LINAC status

  • 10kW was reached at 25MeV (EINJ setting ~710).
  • Next goal is 10kW at 30MeV.
  • Fields were measured by RPG outside of the ehall and didn't appear to increase with higher power
  • RPG measured fields at the dump afterwards. ~10uSvr/hr as usual.
  • On Wednesday evening energy was already increased to 27.8 MeV at 6kW. Tune wasn't ideal. Spills just at threshold limits in high energy section. AL slightly increased levels from 50nC to ~75nC to avoid trips. In high energy section we have factor of 2 safety margin before hitting 100nC in 100ms losses.


AOB

  • AL reached out to Thomas about meeting for global reset. Will arrange meeting time when Thomas is back from vacation
  • After MPS re-commissioning report, AL will write up LED calibration specs
  • Still need to get Post-Mortem data to analyse from BLM trips.
  • No update on fibre. Reflector has not arrived yet.