Lennarz: Created page with "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 t..."

2021-08-25T19:06:54Z

Created page with "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 t..."

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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.

==Action Items==
*AL to arrange meeting with Thomas
*AL to finish MPS re-commissioning report
*AL/MA to coordinate dark current scan with Thomas/Yanyun/Ops
*MA/AT/AL test fibre with reflector and beam. Test position sensitivity
*AL to write up LED calibration specs
*MA/AL write up specs for beam enable after commissioning results.

MPS Minutes 20210818 - Revision history

Lennarz: Created page with "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 t..."

Lennarz: Created page with "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 t..."