MPS Minutes 20220120

BLM calibration

AL preparing documents for requirements and specs
Needs to be done at reasonable background levels, i.e., not with high dark current conditions from cavities.
Should this go hand in hand with scan to verify coverage after a long shut down period?
Add flow chart for sequence of events
AL to implement comments for BLM calibration requirements/specs document and send out to reviewers
Add requirements: For instance, beam needs to be off for calibration, cavities off => procedure during downtime
Add Rod, Alex and Brandon as reviewer, Mike for final approval
Make sure to define times precisely
Use 2 calibration points for PMTs to verify linearity

AL preparing documents for requirements and specs
Add requirements and table
6-7 VS with 1 or 2 BLMs to be prevented from tripping
Be clear on definition of "disabled". Trip function should be disabled, but readback must be available.

Darklight and FLASH installation complete
Email from Luca Egoriti last week: hoping to put beam on the FLASH station (the old EMBD dump) as soon as the e-linac is back in shape, and since the shielding envelope has changed we foresee higher dose rates in the ehall coming from the target/dump. Hence, we wanted to let you know since there might be some MPS work to be done to accommodate the modifications
Recommissioning required for medium and high energy section.
1kW for FLASH dump in pulse mode. 1W in continuous mode. There might be extra room for BLM thresholds ==> AL to follow up with Luca E.
original dump design was for 500W ?

MA in contact with Hamamatsu on lead times for PMTs. Seem to be around 2-3 months.
2 PMTs may be available from Conny
Thomas Lindner took his PMT back end of 2021
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

Making LICs for BL4N once cases are down a bit
HH offers to be around when Phil L. shows AL and MA how to manufacturer LICs. Possible option to make the LICs in electronics shop.
MA to check with Phil L. if all parts are available.
Do we have enough for full length of tunnel?
Might make longer LICs depending on required position resolution
Tricky part might be the end caps to seal Argon connections.

AL to follow up with Luca E. on power levels for FLASH dump.
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
2nd stage trip implementation:
- Final status of implementation?
- What is left to do/needed?
Do all channels already have an HV OK? Do some still need to be added to watchdog?