TUAD1

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URL	https://doi.org/10.18429/JACoW-IPAC2025-TUAD1
Title	Progress in LINAC beam commissioning for high-intensity operations for J-PARC power upgrades
Authors	Y. Liu, E. Cicek, K. Nanmo, K. Futatsukawa, M. Otani, S. Mizobata, T. Miyao, Y. Nakazawa, Y. Fukui, Z. Fang High Energy Accelerator Research Organization A. Miura, K. Moriya, K. Ohkoshi, K. Okabe, P. Saha, R. Kitamura, T. Shibata Japan Proton Accelerator Research Complex F. Tamura, H. Nakano, H. Takahashi, J. Tamura, K. Shinto, S. Shinozaki, T. Itou, T. Morishita, Y. Fuwa, Y. Kondo Japan Atomic Energy Agency F. Kobayashi Ulvac (Japan)
Abstract	The Japan Proton Accelerator Research Complex (J-PARC) has achieved stable 1 MW operation test on its neutron target and is advancing toward higher power levels of 1.5 MW to support high-power MR operations and a second target station. This progression presents challenges, including increased intra-beam stripping (IBSt) of H⁻ ions, chop leakage from higher beam currents and emittance, low-energy beam loss due to halo formation, frontend fluctuations affecting beam transmission, and RF phase and amplitude fluctuations. To address these issues, a redesigned lattice mitigates IBSt, a new MEBT1 improves chopping and collimation, and machine learning-based compensation schemes manage frontend and RF fluctuations. Additionally, longitudinal and transverse matching schemes enhance beam quality, validated through benchmarked longitudinal measurements. Results from studies at 50 mA and 60 mA beam currents demonstrate significant progress in overcoming these challenges.
Paper	download: TUAD1.pdf
Cite	BibTeX, LaTeX, Text/Word, RIS, EndNote
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	30 May 2025
Accepted	02 June 2025
Issued	05 November 2025
DOI	10.18429/JACoW-IPAC2025-TUAD1
Pages	855-857
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.