Author: Iwashita, Y.
Paper Title Page
WEPWA018 Re-acceleration of Ultra Cold Muon in J-PARC MLF 2532
 
  • M. Yoshida, F. Naito
    KEK, Ibaraki, Japan
  • S. Artikova, Y. Kondo
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • N. Hayashizaki
    RLNR, Tokyo, Japan
  • Y. Iwashita
    Kyoto ICR, Uji, Kyoto, Japan
  • K. Torikai
    Gunma University, Heavy-Ion Medical Research Center, Maebashi-Gunma, Japan
  
  Funding: MEXT KAKENHI Grant Number 6108718
The ultra cold muon beam by two-photon laser resonant ionization of muonium atoms is unique way to obtain very low emittance muon beam. Its muon source is a surface muon from the muon target in MLF where one percent proton beam from J-PARC RCS is reacted. In close collaboration with the Muon Science Es- tablishment (MUSE) at Material and Life science experi- mental Facility (MLF) of the Japan Proton Accelerator Re- search Complex (J-PARC), we are developing the reacceleration system of the ultra cold muon beam. Its optimum accelerating structure is similar to a proton accelerator in low beta part and an electron accelerator in high beta part. Further the muon bunch is only two bunch corresponding to the bunch structure of the J-PARC RCS. Thus we are testing the dielectric transmission line accelerator based on the photoconductive switch as the altenative acceleration method. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWA018  
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WEPWA023 Development of Muon LINAC for the Muon g-2/EDM Experiment at J-PARC 2541
 
  • M. Otani, Y. Fukao, T. Mibe, N. Saito, M. Yoshida
    KEK, Ibaraki, Japan
  • Y. Iwashita
    Kyoto ICR, Uji, Kyoto, Japan
  • R. Kitamura
    University of Tokyo, Tokyo, Japan
  • Y. Kondo
    JAEA, Ibaraki-ken, Japan
  
  The muon anomalous magnetic moment (g-2) and electric dipole moment (EDM) are one of the effective paths to beyond Standard Model of elementary particle physics. The E34 experiment aims to measure g-2 with a precision of 0.1 ppm and search EDM with a sensitivity to 10-21 e*cm with high intensity proton driver at J-PARC and a newly developed novel technique of the ultra-cold muon beam. The ultra-cold muons, which are generated from surface muons by the thermal muonium production and laser ionization, are accelerated to 300 MeV/c by muon linear accelerator. The muon LINAC consists of RFQ and following three types of the RF cavities. The muon acceleration to this energy will be the first case in the world. This poster reports about status of the initial acceleration test with RFQ and the development of the RF cavities, especially for the middle beta section.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWA023  
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WEPWA025 RF Acceleration of Ions Produced by Short Pulse Laser 2548
 
  • Y. Fuwa, M. Hashida, Y. Iwashita, S. Sakabe, H. Tongu
    Kyoto ICR, Uji, Kyoto, Japan
  • M. Okamura
    BNL, Upton, Long Island, New York, USA
  • A. Yamazaki
    Nagoya University, Nagoya, Japan
  
  Funding: This work was supported by Grant-in-Aid for Exploratory Research Number 23654085.
RF acceleration of ions produced by short pulse laser is investigated. An RF cavity is prepared for the acceleration. Some experimental results will be presented. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWA025  
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WEPMA053 Multipactor Simulations in 325 MHz Superconducting Spoke Cavity for an Electron Accelerator 2892
 
  • T. Kubo, T. Saeki
    KEK, Ibaraki, Japan
  • E. Cenni, Y. Iwashita, H. Tongu
    Kyoto ICR, Uji, Kyoto, Japan
  • R. Hajima, M. Sawamura
    JAEA, Ibaraki-ken, Japan
  
  Funding: The work is supported by Photon and Quantum Basic Research Coordinated Development Program from the Ministry of Education, Culture, Sports, Science and Technology, Japan.
In order to realize a compact industrial-use X-ray source with the laser-Compton scattering, a 325MHz superconducting spoke cavity for an electron accelerator operated at 4K is under development. After design-optimizations of the first cavity, we started fabrication process. In this paper, multipactor analyses carried out as parts of the design-optimization efforts are briefly summarized. Relations between cavity geometries and averaged secondary electron emission yield are discussed. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMA053  
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WEPMA056 Development of Superconducting Spoke Cavities for Laser Compton Scattered X-ray Sources 2902
 
  • R. Hajima, M. Sawamura
    JAEA, Ibaraki-ken, Japan
  • E. Cenni, Y. Iwashita, H. Tongu
    Kyoto ICR, Uji, Kyoto, Japan
  • T. Kubo, T. Saeki
    KEK, Ibaraki, Japan
  
  Funding: This study is supported by Photon and Quantum Basic Research Coordinated Development Program of MEXT, Japan.
A 5-year research program on the development of superconducting spoke cavities for electron accelerators has been funded by MEXT, Japan since 2013. The purpose of our program is establishing design and fabrication processes of superconducting spoke cavity optimized for compact X-ray sources based on laser Compton scattering. The spoke cavity is expected to realize a compact industrial-use X-ray source with a reasonable cost and easy operation. We have chosen a cavity frequency at 325 MHz due to possible operation at 4 K and carried out cavity shape optimization in terms of electromagnetic and mechanical properties. Production of press-forming dies is also in progress. In this paper, we present overview and up-to-date status of the research program. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMA056  
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THPF047 New Series of RFQ Vane Shapes 3808
 
  • Y. Iwashita, Y. Fuwa
    Kyoto ICR, Uji, Kyoto, Japan
  
  New series of RFQ vane shapes are under investigation by introducing more terms in addition to the two term potential. Because they can incorporate with the feature of the trapezoidal shape modulation with less multipole components, higher acceleration efficiency is expected. The simulation study will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF047  
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