Author: Osaki, K.
Paper Title Page
MOZA01 Ultralow Emittance Beam Production based on Doppler Laser Cooling and Coupling Resonance 28
 
  • A. Noda, M. Nakao
    NIRS, Chiba-shi, Japan
  • M. Grieser
    MPI-K, Heidelberg, Germany
  • Z.Q. He
    FRIB, East Lansing, Michigan, USA
  • Z.Q. He
    TUB, Beijing, People's Republic of China
  • K. Jimbo
    Kyoto University, Kyoto, Japan
  • H. Okamoto, K. Osaki
    HU/AdSM, Higashi-Hiroshima, Japan
  • A.V. Smirnov
    JINR, Dubna, Moscow Region, Russia
  • H. Souda
    Gunma University, Heavy-Ion Medical Research Center, Maebashi-Gunma, Japan
  • H. Tongu
    Kyoto ICR, Uji, Kyoto, Japan
  • Y. Yuri
    JAEA/TARRI, Gunma-ken, Japan
  
  Funding: Work supported by Advanced Compact Accelerator Development project by MEXT of Japan. It is also supported by GCOE project at Kyoto University, “The next generation of Physics-Spun from Universality"
Doppler laser cooling has been applied to low-energy (40 keV) Mg ions together with the resonant coupling method* at the S-LSR at ICR, Kyoto University,. The S-LSR storage ring has a high super periodicity of 6, which is preferable from the beam dynamical point of view. At S-LSR one dimensional ordering of proton beam was already realized for the first time**. Active three dimensional laser cooling has been experimentally demonstrated for ions with un-negligible velocity (v/c=0.0019, where c is the light velocity) for the first time. Utilizing the above mentioned characteristics of S-LSR, an approach to realize ultralow emittances has been pursuit. To suppress heating effects, due to intra-beam scattering, the circulating ion beam intensity was reduced by scraping and beam emittances of 1.3·10-11 pi m·rad and 8.5·10-12 pi m·rad (normalized) have been realized for the horizontal and vertical directions, respectively with the 40 keV Mg ion beam at a beam intensity of ~104, which is the lowest emittance ever attained by laser cooling. From MD computer simulations, it is predicted that reduction of the ion number to about 103 is needed to realize a crystalline string.
* H. Okamoto, A.M. Sessler, D. Moehl, Phys. Rev. Lett. 72, 397 (1994).
** T. Shirai et. al., Phys. Rev. Lett. 98, 204801 (2007).
 
slides icon Slides MOZA01 [13.336 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOZA01  
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FRXAA01 Beam Dynamics Studies with Non-neutral Plasma Traps 4052
 
  • H. Okamoto, K. Fukushima, H. Higaki, K. Ito, K. Moriya, T. Okano, K. Osaki
    HU/AdSM, Higashi-Hiroshima, Japan
  
  Both Paul ion traps and Penning traps have been employed at Hiroshima University to explore fundamental aspects of space-charge dominated beam dynamics. These compact accelerator-free experiments are based on an isomorphism between non-neutral plasmas in a trap and charged-particle beams traveling in a periodic focusing channel. This talk highlights the recent experimental results on coherent betatron resonances in various strong-focusing lattices, resonance crossing in non-scaling FFAG accelerators, ultra-low emittance beam stability, and halo formation.  
slides icon Slides FRXAA01 [5.557 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-FRXAA01  
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