MPS Minutes 20220120

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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.
  • 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 ?

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.