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FCC-FS EPOL group meeting 42

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Description

The FCC technical and financial feasibility study comprises a work package (EPOL) on precision determination of the centre of mass energy at FCCee. using resonant depolarisation of the beams, in conjunction with precise measurement of the energy spread and other parameters using physics events in the detectors, and other beam diagnostics in particular to control the collision parameters. Specific equipment involves polarimeters for both beams, polarisation wigglers, and depolarising RF kickers. The possible mono-chromatization of the beams in view of a measurement of the e+ e- —> H (125) process will also be studied and special requirements investigated. 

Short group meetings are foreseen at 15:00 on Friday.

FCC-FS EPOL group meeting
Zoom Meeting ID
63437787216
Host
Alain Blondel
Alternative host
Jacqueline Keintzel
Useful links
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J. Keintzel statest the FCC 

Following C. Carli's question, one kicker is used in BMAD, GHC V23. 

There are minutes attached to this event. Show them.
    • 15:00 → 15:10
      Introduction and news 10m
      Speakers: Prof. Eric Torrence (University of Oregon (US)), Guy Wilkinson (University of Oxford (GB)), Jacqueline Keintzel (CERN)
    • 15:10 → 15:30
      Comments on spin decoherence 20m
      Speaker: Desmond Barber
      EPOL20251017.pdf
    • 15:30 → 15:50
      RDP studies 20m
      Speaker: Yi Wu (EPFL - Ecole Polytechnique Federale Lausanne (CH))
      EPOL Oct 2025.pdf
    • 15:50 → 16:10
      Resonant depolarization and spin tune determination with Xsuite 20m
      Speaker: Jorg Wenninger (CERN)
      Xsuite-LEP-FCC.RDP.Oct2025.pdf
      Xsuite-LEP-FCC.RDP.Oct2025.pptx
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