4 Beam Dynamics, Extreme Beams, Sources and Beam Related Technology
4F Other Beams
Paper Title Page
MOOP07 Development of Ultracold Neutron Accelerator for Time Focusing of Pulsed Neutrons 56
MOPRC001   use link to see paper's listing under its alternate paper code  
SPWR015   use link to see paper's listing under its alternate paper code  
 
  • S. Imajo
    Kyoto University, Kyoto, Japan
  • T. Ino, K. Mishima
    KEK, Ibaraki, Japan
  • Y. Iwashita
    Kyoto ICR, Uji, Kyoto, Japan
  • M. Kitaguchi, H.M. Shimizu
    Nagoya University, Nagoya, Japan
  • S. Yamashita
    ICEPP, Tokyo, Japan
 
  Low energy neutron accelerator can be realized by the combination of an adiabatic fast passage spin flipper and a gradient magnetic field. Neutrons have magnetic moments, so that the accumulated potential energies are not cancelled before and after passage of a magnetic field and their kinetic energies change in case their spins are flipped in the field. This accelerator handles lower kinetic energy neutrons than approximately 300 neV. Currently we have developed the advanced version which makes it possible to handle broader kinetic energy range. The design and measured characteristics are described.  
slides icon Slides MOOP07 [1.313 MB]  
poster icon Poster MOOP07 [1.389 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOOP07  
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MOOP09 Dielectric and THz Acceleration (Data) Programme at the Cockcroft Institute 62
MOPRC003   use link to see paper's listing under its alternate paper code  
 
  • S.P. Jamison, Y.M. Saveliev
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • R.B. Appleby, H.L. Owen, T.H. Pacey, T.H. Pacey, G.X. Xia
    UMAN, Manchester, United Kingdom
  • G. Burt, R. Letizia, C. Paoloni
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  • A.W. Cross
    USTRAT/SUPA, Glasgow, United Kingdom
  • D.M. Graham
    The University of Manchester, The Photon Science Institute, Manchester, United Kingdom
  • C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
  • C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
 
  Funding: This work has been funded by STFC
Normal conducting RF systems are currently able to pro-vide gradients of around 100 MV/m, limited by break-down on the metallic structures. The breakdown rate is known to scale with pulse length and, in conventional RF systems, this is limited by the filling time of the RF struc-ture. Progressing to higher frequencies, from RF to THz and optical, can utilise higher gradient structures due to the fast filling times. Further increases in gradient may be possible by replacing metallic structures with dielectric structures. The DATA programme at the Cockcroft Insti-tute is investigating concepts for particle acceleration with laser driven THz sources and dielectric structures, beam driven dielectric and metallic structures, and optical and infrared laser acceleration using grating and photonic structures. A cornerstone of the programme is the VELA and CLARA electron accelerator test facility at Daresbury Laboratory which will be used for proof-of-principle experiments demonstrating particle acceleration.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOOP09  
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THPRC028 Deflector Design for Spin Rotator in Muon Linear Accelerator 830
 
  • S. Artikova
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • Y. Kondo
    JAEA, Ibaraki-ken, Japan
  • T. Mibe, M. Otani
    KEK, Tsukuba, Japan
 
  A muon g-2/EDM experiment based on muon linear accelerator was proposed for the J-PARC muon facility. In this experiment, the ultra-slow muons created in muonium target region will be accelerated to 210 MeV kinetic energy then will be injected into the muon storage ring to measure the decay products depending on the muon spin. Therefore, a spin rotator (device) is a key component of the muon linac. Spin rotator consists of a pair of combined electrostatic and magnetic deflectors and a pair of solenoids which will be placed in between these two deflectors. In this paper, we report the design of these two dispersion-free deflectors and the simulation results of the device performance will be discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPRC028  
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FR1A05 Development of a Muon Linac for the G-2/EDM Experiment at J-PARC 1037
 
  • M. Otani, N. Kawamura, T. Mibe, F. Naito, M. Yoshida
    KEK, Tsukuba, Japan
  • K. Hasegawa, Y. Kondo
    JAEA, Ibaraki-ken, Japan
  • N. Hayashizaki
    RLNR, Tokyo, Japan
  • T. Ito
    JAEA/J-PARC, Tokai-mura, Japan
  • Y. Iwashita
    Kyoto ICR, Uji, Kyoto, Japan
  • Y. Iwata
    NIRS, Chiba-shi, Japan
  • R. Kitamura
    University of Tokyo, Tokyo, Japan
  • N. Saito
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
 
  Precision measurements of the muon's anomalous magnetic moment (g-2) and electric dipole moment (EDM) are one of the effective ways to test the standard model. An ultra-cold muon beam is generated from a surface muon beam by a thermal muonium production and accelerated to 300 MeV/c by a linac. The muon linac consists of an RFQ, an inter-digital IH, a Disk And Washer structure, and a disk loaded structure. The ultra-cold muons will have an extremely small momentum spread of 0.3 % with a normalized transverse emittance of around 1.5 pi mm-mrad. The design and status of the muon linac at J-PARC will be presented.  
slides icon Slides FR1A05 [13.154 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-FR1A05  
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