WEPR20

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URL	https://doi.org/10.18429/JACoW-IPAC2024-WEPR20
Title	Probing FCC-ee energy calibration through resonant depolarization at KARA
Authors	F. Zimmermann, J. Keintzel European Organization for Nuclear Research A. Mueller, B. Haerer, E. Blomley, J. Steinmann, J. Gethmann, R. Ruprecht Karlsruhe Institute of Technology E. Huttel Karlsruhe Instutute of Technology T. Pieloni, Y. Wu Ecole Polytechnique Fédérale de Lausanne
Abstract	The FCC-ee collider physics program requires a precise determination of the center-of-mass energy. The average energies of the two colliding beams can be measured by resonant depolarization (RDP) of polarized electron and positron bunches. The depolarization is achieved by an electromagnetic device, e.g., a strip line, excited at a sweeping frequency. Once the excitation frequency is equal to the spin precession frequency, which is directly proportional to the beam energy, the polarization is lost or reduced. At KARA the resonant frequency is routinely measured via the change of the Touschek lifetime. We report on an RDP beam measurement campaign at the Karlsruhe Research Accelerator (KARA), exploring how this technique could be applied at the FCC-ee. In particular, we examine the sensitivity of the inferred value of beam energy to various parameters, such as the depolarize scan speed, the scan direction, and the beam operation energy.
Paper	download: WEPR20.pdf
Cite	BibTeX, LaTeX, Text/Word, RIS, EndNote
Conference	15th International Particle Accelerator Conference
Series
Location	Nashville, TN
Date	19-24 May 2024
Publisher	JACoW Publishing, Geneva, Switzerland
Editorial Board	Fulvia Pilat - Oak Ridge National Laboratory Wolfram Fischer - Brookhaven National Laboratory Robert Saethre - Oak Ridge National Laboratory Petr Anisimov - Los Alamos National Laboratory Ivan Andrian - Elettra-Sincrotrone Trieste S.C.p.A.
Online ISBN	978-3-95450-247-9
Online ISSN	2673-5490
Received	14 May 2024
Revised	18 May 2024
Accepted	21 May 2024
Issued	01 July 2024
DOI	10.18429/JACoW-IPAC2024-WEPR20
Pages	2516-2519
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.