| Paper |
Title |
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| MOPAB325 |
Development of Bunch Width Monitor with High Time Resolution for Low Emittance Muon Beam in the J-PARC Muon g-2 / EDM Experiment |
1004 |
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- M. Yotsuzuka, T. Iijima, K. Inami, Y. Sue, K. Sumi
Nagoya University, Graduate School of Science, Chikusa-ku, Nagoya, Japan
- T. Iijima
KMI, Nagoya, AIchi Prefecture, Japan
- Y. Kondo
JAEA, Ibaraki-ken, Japan
- T. Mibe
KEK, Tsukuba, Japan
- Y. Nakazawa
Ibaraki University, 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
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The J-PARC muon g-2/EDM experiment plans to measure the muon anomalous magnetic moment and electric dipole moment sensitive to new physics with high precision. This experiment uses a novel method using the low-emittance muon beam achieved by cooling and re-acceleration. In the muon linac consisting of four different accelerating cavities, the main cause of the emittance growth is the beam mismatch between the different cavities. Especially for the cavity in the low-beta section (ß=0.08-0.27), the longitudinal acceptance is narrow and beam mismatch has a significant impact. In order to perform beam matching in the low-beta cavity, a new beam monitor that can measure the low-emittance muon beam with high time resolution is required. Therefore, we developed a bunch width monitor (BWM) using a microchannel plate. The time resolution of the BWM was measured to be 40 picoseconds on the test bench using a picosecond pulse laser. It means that the BWM is possible to perform diagnosis with a phase accuracy of 1% for the acceleration phase of 324 MHz. We also evaluated factors that limit the current time resolution. In this presentation, the results of an evaluation of the BWM are reported.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB325
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| About • |
paper received ※ 19 May 2021 paper accepted ※ 08 June 2021 issue date ※ 10 August 2021 |
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| TUPAB174 |
Basic Design Study for Disk-Loaded Structure in Muon LINAC |
1801 |
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- 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
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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.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB174
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|
| About • |
paper received ※ 19 May 2021 paper accepted ※ 31 August 2021 issue date ※ 18 August 2021 |
|
| Export • |
reference for this paper using
※ BibTeX,
※ LaTeX,
※ Text/Word,
※ RIS,
※ EndNote (xml)
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