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Title	The Muon Linac Project at J-PARC
Authors	Y. Kondo, Y. Fuwa, R. Kitamura, K. Moriya, T. Takayanagi JAEA/J-PARC, Tokai-mura, Japan S. Bae, H. Choi, S. Choi, B. Kim, H.S. Ko SNU, Seoul, Republic of Korea E. Cicek, H. Ego, Y. Fukao, K. Futatsukawa, N. Kawamura, T. Mibe, Y. Miyake, S. Mizobata, M. Otani, N. Saito, K. Shimomura, T. Yamazaki, M. Yoshida KEK, Ibaraki, Japan K. Hasegawa QST Rokkasho, Aomori, Japan N. Hayashizaki Research Laboratory for Nuclear Research, Tokyo Institute of Technology, Tokyo, Japan T. Iijima, Y. Sue, K. Sumi Nagoya University, Graduate School of Science, Chikusa-ku, Nagoya, Japan H. Iinuma, Y. Nakazawa Ibaraki University, Ibaraki, Japan K. Inami, K. Suzuki, M. Yotsuzuka Nagoya University, Nagoya, Japan K. Ishida RIKEN Nishina Center, Wako, Japan Y. Iwashita Kyoto ICR, Uji, Kyoto, Japan T. Morishita JAEA/LINAC, Ibaraki-ken, Japan G.P. Razuvaev Budker INP & NSU, Novosibirsk, Russia Y. Takeuchi, J. Tojo Kyushu University, Fukuoka, Japan E. Won Korea University, Seoul, Republic of Korea H.Y. Yasuda University of Tokyo, Tokyo, Japan
Abstract	The muon linac project for the precise measurement of the muon anomalous magnetic and electric dipole moments, which is currently one of the hottest issues of the elementary particle physics, is in progress at J-PARC. The muons from the J-PARC muon facility are once cooled to room temperature, then accelerated up to 212 MeV with a normalized emittance of 1.5 pi mm mrad and a momentum spread of 0.1%. Four types of accelerating structures are adopted to obtain the efficient acceleration with a wide beta range from 0.01 to 0.94. The project is moving into the construction phase. They already demonstrated the re-acceleration scheme of the decelerated muons using a 324-MHz RFQ in 2017. The high-power test of the 324-MHz Interdigital H-mode (IH) DTL using a prototype cavity will be performed in 2021. The fabrication of the first module of 14 modules of the 1296-MHz Disk and Washer (DAW) CCL will be done to confirm the production process. Moreover, the final design of the travelling wave accelerating structure for the high beta region is also proceeding. In this presentation, the recent progress toward the realization of the world first muon linac will be presented.
Paper	download WE1AA05.PDF [8.521 MB / 6 pages]
Slides	download WE1AA05_TALK.PDF [3.764 MB]
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Conference	LINAC2022
Series	International Linear Accelerator Conference (31st)
Location	Liverpool, UK
Date	28 August-02 September 2022
Publisher	JACoW Publishing, Geneva, Switzerland
Editorial Board	Peter McIntosh (STFC DL, Daresbury, UK); Graeme Burt (Lancaster Univ., Lancaster, UK); Robert Apsimon (Lancaster Univ., Lancaster, UK); Volker R.W. Schaa (GSI, Darmstadt, Germany)
Online ISBN	978-3-95450-215-8
Online ISSN	2226-0366
Received	14 August 2022
Revised	21 August 2022
Accepted	01 September 2022
Issue Date	16 September 2022
DOI	doi:10.18429/JACoW-LINAC2022-WE1AA05
Pages	636-641
Copyright	Published by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 International license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI.