MPS Minutes 20220120

Meeting commenced: 10:00am Meeting adjourned: 10:36am Present: HH, MA, KL, RN, MR, RC, AD, AL

E-Linac status

• Unclear when beam will be back.
• What are priorities once beam is back? FLASH station?
• Hoping for more information in Friday meeting

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

View screen / BLM interlocks for tuning

• 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.

FLASH/Darklight effect on MPS

• 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.
• Power limits for FLASH dump? 1kW for FLASH dump in pulse mode? 200W in continuous mode. There might be extra room for BLM thresholds ==> AL to follow up with Luca E.
• original dump design was for 500W ?

Fibre

• 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

AOB

• 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.

Action Items

• 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.