MC4: Hadron Accelerators
A09 Muon Accelerators and Neutrino Factories

Paper	Title	Page
TUPAB174	Basic Design Study for Disk-Loaded Structure in Muon LINAC	1801
	K. Sumi, T. Iijima, K. Inami, Y. Sue, M. Yotsuzuka Nagoya University, Graduate School of Science, Chikusa-ku, Nagoya, Japan H. Ego, T. Mibe, M. Yoshida KEK, Ibaraki, Japan T. Iijima KMI, Nagoya, AIchi Prefecture, Japan Y. Kondo JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan Y. Nakazawa Ibaraki University, Hitachi, Ibaraki, Japan M. Otani, N. Saito J-PARC, KEK & JAEA, Ibaraki-ken, Japan Y. Takeuchi Kyushu University, Fukuoka, Japan H.Y. Yasuda University of Tokyo, Tokyo, Japan
	The world’s first disk-loaded structure (DLS) at the high-velocity part of a muon LINAC is under development for the J-PARC muon g-2/EDM experiment. We have simulated the first designed constant impedance DLS to accelerate muons from ß = 0.7 to 0.94 at an operating frequency of 1296 MHz and a phase of -10 degrees to ensure longitudinal acceptance and have shown the quality of the beam meets our requirements. Because the structure needs a high RF power of 80 MW to generate a gradient of 20 MV/m, a constant gradient DLS with the higher acceleration efficiency is being studied for lower operating RF power. In this poster, we will show the cell structure design yielding a gradient of 20 MV/m with lower RF power.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB174
About •	paper received ※ 19 May 2021       paper accepted ※ 31 August 2021       issue date ※ 18 August 2021
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TUPAB175	ESSnuSB Linac and Transfer Line: Lattice Design and Error Studies	1805
	N. Blaskovic Kraljevic, M. Eshraqi, B.T. Folsom ESS, Lund, Sweden
	Funding: ESSnuSB has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 777419. The ESS neutrino superbeam (ESSnuSB) project is being studied as an upgrade to the European Spallation Source (ESS). This proposed upgrade consists of adding an H− source to the existing beamline in order to send H− pulses in between proton pulses, effectively doubling the beam power from 5 MW to 10 MW. In this contribution, we present the 2.5 GeV linear accelerator (linac) lattice and the design of the transfer line from the linac to the accumulator ring, where pulses would be stacked to achieve short proton pulses of high intensity. The results of error studies, quantifying the effect of accelerator imperfections and H− ion stripping losses on the beam transport through the linac and transfer line, are also presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB175
About •	paper received ※ 19 May 2021       paper accepted ※ 14 June 2021       issue date ※ 31 August 2021
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WEXB06	Development of an APF IH-DTL in the J-PARC Muon g-2/EDM Experiment	2544
	Y. Nakazawa, H. Iinuma Ibaraki University, Hitachi, Ibaraki, Japan E. Cicek, N. Kawamura, T. Mibe, M. Yoshida KEK, Ibaraki, Japan N. Hayashizaki RLNR, Tokyo, Japan Y. Iwata NIRS, Chiba-shi, Japan R. Kitamura, Y. Kondo, T. Morishita JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan M. Otani, N. Saito J-PARC, KEK & JAEA, Ibaraki-ken, Japan Y. Sue, K. Sumi, M. Yotsuzuka Nagoya University, Graduate School of Science, Chikusa-ku, Nagoya, Japan Y. Takeuchi Kyushu University, Fukuoka, Japan T. Yamazaki KEK, Tokai Branch, Tokai, Naka, Ibaraki, Japan H.Y. Yasuda University of Tokyo, Tokyo, Japan
	An inter-digital H-mode drift-tube linac (IH-DTL) is under development in a muon linac at the J-PARC muon g-2/EDM experiment. It accelerates muons from 0.34 MeV to 4.3 MeV at an operating frequency of 324 MHz. The cavity can be miniaturized by introducing the alternative phase focusing (APF) method that enables transverse focusing only with an E-field. The APF IH-DTL cavity was modeled by a three-dimensional field analysis, and the beam dynamics were evaluated numerically. The beam emittance was calculated as 0.316pi and 0.189pi mm mrad in the horizontal and vertical directions, respectively. It satisfies the experimental requirement. Actually, the field error due to the fabrication errors and thermal expansion during operation causes an emittance growth. It was evaluated that the optimized tuners can suppress the emittance growth to less than 10%. In this paper, the detailed design of the APF IH-DTL including the tuner will be reported.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEXB06
About •	paper received ※ 19 May 2021       paper accepted ※ 29 July 2021       issue date ※ 20 August 2021
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THPAB175	nuSTORM Accelerator Challenges and Opportunities	4104
	C.T. Rogers, J.-B. Lagrange STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom N. Gall CERN, Meyrin, Switzerland J. Pasternak STFC/RAL, Chilton, Didcot, Oxon, United Kingdom J. Pasternak Imperial College of Science and Technology, Department of Physics, London, United Kingdom
	The nuSTORM facility uses a stored muon beam to generate a neutrino source. Muons are captured and stored in a storage ring using stochastic injection. The facility will aim to measure neutrino-nucleus scattering cross-sections with uniquely well-characterized neutrino beams; to facilitate the search for sterile neutrino and other Beyond Standard Model processes with exquisite sensitivity, and to provide a muon source that makes an excellent technology test-bed required for the development of muon beams capable of serving as a multi-TeV collider. In this paper, we describe the latest status of the development of nuSTORM, the R&D needs, and the potential for nuSTORM as a Muon Collider test facility.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB175
About •	paper received ※ 19 May 2021       paper accepted ※ 19 July 2021       issue date ※ 31 August 2021
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