MOPM039

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URL	https://doi.org/10.18429/JACoW-IPAC25-MOPM039
Title	Updated monochromatization Interaction Region optics design for FCC-ee GHC lattice
Authors	A. Korsun, A. Faus-Golfe Université Paris-Saclay, CNRS/IN2P3, IJCLab F. Zimmermann European Organization for Nuclear Research K. Oide European Organization for Nuclear Research, University of Geneva P. Raimondi Fermi National Accelerator Laboratory Z. Zhang Institute of High Energy Physics, Université Paris-Saclay, CNRS/IN2P3, IJCLab
Abstract	Determining Yukawa couplings of the Higgs boson is one of the most fundamental and outstanding measurements since its discovery. The FCC-ee, owing to its exceptionally high-integrated luminosity, offers the unique opportunity to measure the electron Yukawa coupling through s-channel Higgs production at 125 GeV centre-of-mass (CM) energy, provided that the CM energy spread can be reduced from 50 MeV to a level comparable to the Higgs bosons’ natural width of 4.1 MeV. To improve the energy resolution and reach the desired collision energy spread, the concept of a monochromatization mode has been proposed as a new operation mode at the FCC-ee, relying on the Interaction Region (IR) optics design with a nonzero dispersion function of opposite signs at the interaction point (IP). A first optics design and preliminary beam dynamics simulations have been carried out for V22 of the FCC-ee GHC lattice type. In response to the continuously evolving FCC-ee GHC optics, this paper presents the first updated monochromatization IR optics design based on V23 of the FCC-ee GHC optics.
Paper	download: MOPM039.pdf
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Conference	16th International Particle Accelerator Conference
Series
Location	Taipei, Taiwan
Date	01-06 Jun 2025
Publisher	JACoW Publishing, Geneva, Switzerland
Editorial Board	* Ming-Chyuan Lin - National Synchrotron Radiation Research Center * Yoichi Sato - KEK * Jui-Che Huang - National Synchrotron Radiation Research Center * David Button - Australian Nuclear Science and Technology Organisation * Ping-Shun Chuang - National Synchrotron Radiation Research Center
Online ISBN	978-3-95450-248-6
Online ISSN	2673-5490
Received	28 May 2025
Revised	05 June 2025
Accepted	06 June 2025
Issued	08 September 2025
DOI	10.18429/JACoW-IPAC25-MOPM039
Pages	402-405
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.