MOPM068

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URL	https://doi.org/10.18429/JACoW-IPAC2025-MOPM068
Title	FCC-ee radiation environment and shielding
Authors	A. Lechner, A. Frasca, A. Romero Francia, A. Perillo Marcone, A. Piccini, B. Humann, C. Järmyr Eriksson, C. Garion, F. Carra, F. Cerutti, G. Lavezzari, G. Lerner, J. Burnet, J. Bauche, J. Manczak, K. Hanke, L. von Freeden, M. Calviani, M. Morrone, M. Widorski, R. Seidenbinder, R. Kersevan, R. Garcia Alia European Organization for Nuclear Research F. Valchkova-Georgieva CEGELEC SA (Actemium Geneve)
Abstract	The secondary radiation fields generated by synchrotron photons pose a significant challenge for equipment in high energy electron and positron storage rings like the Future Circular Collider (FCC-ee) at CERN. The annual ionizing dose can reach MGy-levels in the FCC-ee tunnel and requires the design of a dedicated radiation shielding enclosing the photon stoppers in dipoles. In this paper, we present a first optimization of the shielding design, taking into account different aspects such as shielding efficiency, engineering and integration constraints, raw material costs, and radiological considerations. We demonstrate that the proposed shielding solution can decrease the dose in the tunnel by about two orders of magnitude, which considerably reduces the need of expensive radiation-hard equipment. In addition, we explore the option of housing accelerator electronics in a dedicated bunker near lattice quadrupoles, which can possibly allow for custom-off-the-shelf-based radiation tolerant electronics systems. We quantify the expected radiation levels in this bunker, which are driven by photo-neutron production by the high-energy component of the synchrotron spectrum.
Paper	download: MOPM068.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	27 May 2025
Revised	05 June 2025
Accepted	05 June 2025
Issued	05 November 2025
DOI	10.18429/JACoW-IPAC2025-MOPM068
Pages	482-485
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.