MPS Minutes 20220210

Meeting commenced: 10:00am Meeting adjourned: am Present: HH, MA, KL, RN, MR, RC, AD, AL

E-Linac status

First beam on Tuesday afternoon
Priority is on FLASH
Thomas said maybe first option for MPS is today or on Monday to do re-commissioning scans
- Once that's done, final thresholds can be set and updated in document "E-Linac BLM controls Configuration Specifications". And Darren can mount high energy LIC covers permanently.
They had beam again yesterday, egun ramp up looked like they went to 300kV without major issues. Looked fast on strip tool. Maybe 10 - 15min?
It looks like EINJ was at 980 MV/m. Yesterday EMBT:PMT3 was at 147 pC, EMBD:LIC2 saw 33 pC.
AL turned on Ar flow on Tuesday -> Just one bottle. Other has different valve, which seemed stuck.
- Regarding Ar flow. Do we already have interlocks in place to prevent running beam, when Ar flow is not given? As technically, you don't have proper BLM response and may not catch beam loss. We have specified when beam shall trip, but is this implemented? And does this also apply for inhibit?
Martin had a few more minutes with Thomas, timeline for first tests?

AL ready to send out document, just need to get values for LICs. There was no Ar flow until Tuesday
Will do another manual calibration today, add values and send out
Question on sequence for PMT/LIC. If first calibration point is not checking out, should system continue to second point anyways? Or state calibration error immediately and abort calibration?
Should there be an automated second attempt of the system to calibrate a channel, or should this only be initiated by expert?

Discussion on power limits. Followed up with Luca. Confirmed 1kW maximum power in pulsed mode, which means 0.1mA for a maximum of 1s at 10 MeV. And for continuous beam it would be 200W.

2 PMTs may be available from Conny??
Thomas L. had factory/of-the-shelve fibre coupler. We may need 3D printed coupler and just buy connector. HH thinks this is possbile. Have 3D printer with black plastic available for use.
MA will try to get drawings from manufacturer -> Was this done?

AL talked to Jessica Blando regarding Ar supply. She said she would take over for Rick and continue to be in charge of purchasing. Have quick in person meeting tomorrow as well to check out the valve. JB also doesn't have key for shed?

AL to follow up with Luca E. on power levels for FLASH dump.
AL to send out document for view screen/BLM interlock requirements/specs
AL to implement comments for BLM calibration requirements/specs document and send out to reviewers
MA: What SiPMs and or PMTs are we looking to buy?
Fibre coupler: MA will try to get drawings from manufacturer for 3D printing option
MA to check with Phil L. if all parts are available for BL4N LICs.
2nd stage trip implementation:
- Final status of implementation?
- What is left to do/needed?
AL to take recommissioning scans in medium and high energy section, once beam is back.