MOPL059

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URL	https://doi.org/10.18429/JACoW-IPAC2023-MOPL059
Title	The status of the energy calibration, polarization and monochromatization of the FCC-ee
Authors	J. Bauche, F. Zimmermann, G. Wilkinson, J. Keintzel, J. Wenninger, M. Benedikt, M. Hofer, P. Janot, R. Tomas, T. Pieloni, T. Lefevre, T. Persson European Organization for Nuclear Research A. Blondel, K. Oide Geneva University A. Ciarma, M. Boscolo Istituto Nazionale di Fisica Nucleare A. Faus-Golfe, A. Martens Université Paris-Saclay, CNRS/IN2P3, IJCLab A. Bogomyagkov Synchrotron Radiation Facility D. Gaskell Thomas Jefferson National Accelerator Facility D. Sagan Cornell University (CLASSE) D. Barber, R. Assmann Deutsches Elektronen-Synchrotron D. Shatilov, E. Levichev, I. Koop, I. Nikolaev, S. Nikitin Russian Academy of Sciences E. Gianfelice-Wendt Fermi National Accelerator Laboratory F. Carlier, Y. Wu Ecole Polytechnique Fédérale de Lausanne H. Jiang Laboratoire de Physique des 2 Infinis Irène Joliot-Curie M. Koratzinos Massachusetts Institute of Technology N. Muchnoi Novosibirsk State University P. Raimondi European Synchrotron Radiation Facility R. Rossmanith Karlsruhe Institute of Technology T. Reubenheimer SLAC National Accelerator Laboratory Z. Zhang Institute of High Energy Physics
Abstract	The Future Circular electron-positron Collider, FCC- ee, is designed for unprecedented precision for particle physics experiments from the Z-pole up to above the top-pair-threshold, corresponding to a beam energy range from 45.6 to 182.5 GeV. Performing collisions at various particle-physics resonances requires precise knowledge of the centre-of-mass energy (ECM) and collision boosts at all four interaction points. Measurement of the ECM by resonant depolarization of transversely polarized pilot bunches in combination with a 3D polarimeter, aims to achieve a systematic uncertainty of 4 and 100 keV for the Z-pole and W-pair-threshold energies respectively. The ECM itself depends on the RF-cavity locations, beamstrahlung, longitudinal impedance, the Earth’s tides, opposite sign dispersion and possible collision offsets. Application of monochromatization schemes are envisaged at certain beam energies to reduce the energy spread. The latest results of studies of the energy calibration, polarization and monochromatization are reported here.
Paper	download: MOPL059.pdf
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Conference	14th International Particle Accelerator Conference
Series
Location	Venice, Italy
Date	07-12 May 2023
Publisher	JACoW Publishing, Geneva, Switzerland
Editorial Board	Ralph Assmann - Deutsches Elektronen-Synchrotron DESY Peter McIntosh - Science and Technology Facilities Council (STFC/DL/ASTeC) Giovanni Bisoffi - Istituto Nazionale di Fisica Nucleare (INFN/LNL) Alessandro Fabris - Elettra-Sincrotrone Trieste S.C.p.A. Ivan Andrian - Elettra-Sincrotrone Trieste S.C.p.A. Giulia Vinicola - Istituto Nazionale di Fisica Nucleare (INFN/LNF)
Online ISBN	978-3-95450-231-8
Online ISSN	2673-5490
Received	02 May 2023
Revised	10 May 2023
Accepted	16 June 2023
Issued	26 September 2023
DOI	10.18429/JACoW-IPAC2023-MOPL059
Pages	674-677
Copyright	Published by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI.