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

Thursday 27 Jan 2022, 16:30 → 18:45 Europe/Zurich

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 16:30 on Thursday typically every two weeks. 

16:30 → 16:40 Welcome, Introduction

Speakers: Alain Blondel (Universite de Geneve (CH)), Jorg Wenninger (CERN)

16:40 → 17:00 RF and energy loss effects

Speaker: Jacqueline Keintzel (CERN)

20220127_Keintzel_EPOL_Z_compMADX.pdf

17:00 → 17:20 Exploration of spin polarization simulations in the FCC-ee using Bmad

Speakers: Felix Simon Carlier (EPFL), Tatiana Pieloni (EPF Lausanne), Yi Wu (EPFL - Ecole Polytechnique Federale Lausanne (CH))

EPOL_pre_Yi.pdf

17:20 → 17:40 Exotic monochromatization schemes for FCC-ee

Speaker: Dmitry Shatilov (Budker Institute of Nuclear Physics (RU))

monochr_exotic.pdf

17:40 → 17:55 update on polarimeter precisions

Speaker: Nickolai Muchnoi (Budker INP)

EPOL.pdf

FitResult4x.pdf

FitResult.pdf

Report with polarimeter description: http://jacow.org/eefact2018/papers/tupbb03.pdf 

See "Spectrometer" section on p.159

18:00 → 18:15 Actions, agenda for next meetings