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FCC-FS EPOL group and FCCIS WP2.5 meeting 37

→ Europe/Zurich
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
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The FSR can be found here:

https://cds.cern.ch/record/2928193

http://cds.cern.ch/record/2928793 

http://cds.cern.ch/record/2928194


The complementary EPOL note can be found here: 

https://doi.org/10.17181/5madt-cfy16

J. Tamazirt presets news on the polarimeter fitting results. The errors are in the order of MeV for continous monitoring. G. Wilkinson suggests to understand the biases. 

I. Koop presents news on LEP3. Increasing the Qs to ~ 0.08 would be neccessary for performing RDP at Z.

J. Wenninger presents polarization studies in LEP and FCC. Propagating bumps through LEP lead to spin amplification, while the same idea would lead to chaotic spin motion in FCC-ee. 

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