WEPM112

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URL	https://doi.org/10.18429/JACoW-IPAC2025-WEPM112
Title	Characterization of beam optics considering fringe fields of quadrupole magnets in a LIPAc 5 MeV beamline
Authors	J. Hyun, K. Kondo National Institutes for Quantum Science and Technology A. Mizuno Japan Synchrotron Radiation Research Institute B. Branas Lasala, C. Oliver Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas H. Dzitko, Y. Carin Fusion For Energy I. Integrated Project Team, K. Masuda IFMIF/EVEDA Project Team K. Takayama High Energy Accelerator Research Organization N. Chauvin Commissariat à l'Energie Atomique et aux Energies Alternatives, Commissariat à l'Énergie Atomique et aux Énergies Alternatives
Abstract	The 5 MeV beamline of Phase B+ which is an intermediate commissioning stage of the Linear IFMIF Prototype Accelerator (LIPAc) consists of an MEBT, an MEBT Extension Line (MEL) where the SRF will be installed, a HEBT, and a beam dump. It has 17 quadrupole magnets, and some quads have small aperture-to-length ratios and are also densely installed in the MEBT and HEBT sections. In the early stages of Phase B+, we optimized the beam optics with the conventional hard-edge model for all the quads. However, we observed unwanted particle losses and discrepancies in the rms beam sizes between measurements and simulations due to significant fringe fields and magnetic interference. After considering the field maps and the magnetic interference of the quads in the beam optics, we could obtain the matching beam and reduce the particle losses. In this paper, we characterize the beam optics by comparing the transfer matrices with and without the fringe fields and the interferences using a conventional hard-edge model and a more accurate hard-edge model equivalent to the field maps.
Paper	download: WEPM112.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	16 May 2025
Revised	01 June 2025
Accepted	02 June 2025
Issued	05 November 2025
DOI	10.18429/JACoW-IPAC2025-WEPM112
Pages	2233-2235
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.