TUPB075

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URL	https://doi.org/10.18429/JACoW-IPAC2025-TUPB075
Title	Bunch lengthening of the extraction beam using second harmonic in J-PARC RCS
Authors	K. Adachi Japan Proton Accelerator Research Complex, Kyushu University C. Ohmori, R. Miyakoshi Japan Proton Accelerator Research Complex F. Tamura, H. Okita, M. Nomura, T. Shimada Japan Atomic Energy Agency K. Hasegawa, K. Hara, K. Seiya, M. Yoshii, Y. Sugiyama High Energy Accelerator Research Organization
Abstract	The 3GeV Rapid-Cycling Synchrotron (RCS) at J-PARC supplies the beam to the Main Ring (MR). Under the current operating conditions, there is the longitudinal beam mismatch between RCS and MR. To improve the RCS-MR longitudinal matching, a method for the bunch lengthening of RCS at the extraction is proposed. The method is based on introducing a second harmonic RF voltage at beam extraction and placing the beam at the unstable fixed point. The considerations of the bunch lengthening in the RCS are described in this presentation. The focus is on optimizing the second harmonic RF voltage pattern. Demonstrations of introducing a second harmonic RF voltage are also discussed.
Paper	download: TUPB075.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	07 April 2025
Revised	05 June 2025
Accepted	05 June 2025
Issued	05 November 2025
DOI	10.18429/JACoW-IPAC2025-TUPB075
Pages	1132-1135
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.