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SPS BSRT brainstorming with MBI

→ Europe/Zurich
Chiara Pasquino (CERN), Daniele Butti
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Brainstorming on the MBI aspects of possible SPS BSRT refurbishment

Present: W. Andreazza, S. Burger, D. Butti, C. Pasquino, G. Trad

Discussion

  • existing BSRT in 52150 is presented as a reference. The extraction tank is a legacy from SPS synch light monitors. Bulky design, overkill for needs of present BSRT.
    If it will be decided to remain in this location, only action involving MBI would be suport for survey of the vacuum components (e.g. check status of mirrors).
  • presented current status of light extraction in new location downstream of 51610.
  • Tank installed since LS2. Design of mirror and mirror support are missing. Idea is to design a simplified version of HL-LHC BSRTMB extraction.
    • mirror support should feature modular spacers to adapt the mirror transverse position to possible changes in beam apertures
    • T probes are desiderable
    • existing alignment target may need to be reviewed
  • Mini-hutch can only fit under the QF magnet. Light is delivered with an enclosed optical line with 2 folding mirrors.
    • the folding mirrors can be mounted on a vertical beam in front of extraction tank. COTS optimechanics (e.g. Thorlabs, Newport) to allow maximum flexibility
    • the 3-feet girder of the QF should be rotated 180deg to let the optical line pass alongside the girder post
    • the mini-hutch will be a standard optical breadboard. Light/air tightness is necessary. Magnetic shielding may be necessary to protect B-sensitive electronics from QF leaking fields
    • the optical hutch must be removable in case of magnet replacement
  • Calibration/alignment system
    • existing BSRT features a periscope to insert an illuminated target at the position of the source. Used for both alignment and resollution assessment.
    • periscope for new location needs complete redesign -> take inspiration from other BI equipment that have such insertions
    • new periscope will add extra impedance load to machine (likely tolerable accordng to past communications with IWG)
    • would need to adapt existing VSC equipment (i.e. T-connection for pump)
    • interlock necessary, motorized IN/OUT actuator desiderable

 

Conclusion

  • no interest in modifying existing mechanics (same complexisty as building new line)
  • timeline for BSRT in new location implies a go/no go decision in Q3 2026 to launch the design before end of the year
  • having a persicope in new location is very helpful but not strictly necessary if this becomes a showstopper
  • no technical showstopper from the mechanics point of view

 

Actions

  • propose realistic MBI timeline and resources (budget and person power) to finalize new BSRT, including calibration system (DEADLINE: BI TB on this subject)
  • review with IWG impact of in-vaccum changes (mirror and periscope)
  • mention this task in the pipeline for MME

 

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