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Souda, H.

Paper Title Page
MOPCH088 Ion Cooler Storage Ring, S-LSR 237
 
  • A. Noda, S. Fujimoto, M. Ikegami, T. Shirai, H. Souda, M. Tanabe, H. Tongu
    Kyoto ICR, Uji, Kyoto
  • H. Fadil, M. Grieser
    MPI-K, Heidelberg
  • T. Fujimoto, S.I. Iwata, S. Shibuya
    AEC, Chiba
  • I.N. Meshkov, I.A. Seleznev, A.V. Smirnov, E. Syresin
    JINR, Dubna, Moscow Region
  • K. Noda
    NIRS, Chiba-shi
 
  Ion cooler and storage ring, S-LSR has been constructed. Its beam commissioning has been successfully performed since October, 2005 and electron beam cooling for 7 MeV proton beam has been performed with both flat and hollow spatial distributions. Effect of relative velocity sweep between electron and ion beams on the cooling time* has been confirmed. Based on the success to create the peaks in the energy spectrum of laser-produced ions, injection of laser-produced ions into S-LSR after rotation in the longitudinal phase space by an RF cavity synchronized to the pulse laser is under planning in order to apply electron cooling for such real laser produced hot ions. Three dimensional laser cooling satisfying the condition of 'tapered cooling' is also under investigation. 24Mg+ ions are to be laser-cooled only in the 'Wien Filter' in order to be cooled down to the appropriate energy according to their horizontal positions**. In parallel with the computer simulation, construction of the laser cooling system with use of ring dye laser accompanied with the second harmonics generator is now underway.

*H. Fadil et al. Nucl. Instr. & Meth. in Phys. Res. A517, 1-8 (2004).**A. Noda and M. Grieser, Beam Science and Technology, 9, 12-15 (2005).

 
WEPCH032 Orbit Correction System for S-LSR Dispersion-free Mode 1993
 
  • H. Souda, S. Fujimoto, M. Ikegami, A. Noda, T. Shirai, M. Tanabe
    Kyoto ICR, Uji, Kyoto
  • H. Fadil
    MPI-K, Heidelberg
 
  An ion storage ring S-LSR has been constructed at ICR, Kyoto Univ. It is a small ring with 22.557m circumference, and has an electron cooler and laser cooling section to achieve crystalline beam. In the commissioning process, closed orbit correction of a 7MeV proton beam has been successfully realized by means of Simplex Method. Responses to the correctors are linear only within narrow limits because of the space-charge effect in the electron cooler. Therefore, the correction must be repetition of small corrections. Under such condition, measured COD has been reduced less than 0.1mm. Orbit correction is necessary for 35keV Mg+ dispersion-free mode* using both bending magnets and electrostatic deflectors. Since electrostatic deflectors have relatively large field errors, it needs a special process to inject the beam into the dispersion-free mode ring. First circulation is under only the magnetic field, then, the electric field will be added little by little applying continuous COD correction. In this way the dispersion gradually diminishes with keeping stable orbit. In this paper we present the correction scheme and the trial to the dispersion-free circulation.

*M. Ikegami et al. Phys. Rev. ST-AB, 7, 120101-1 (2004).

 
TUPLS064 Design and Commissioning of a Compact Electron Cooler for the S-LSR 1639
 
  • H. Fadil, S. Fujimoto, A. Noda, T. Shirai, H. Souda, H. Tongu
    Kyoto ICR, Uji, Kyoto
  • T. Fujimoto, S.I. Iwata, S. Shibuya
    AEC, Chiba
  • M. Grieser
    MPI-K, Heidelberg
  • K. Noda
    NIRS, Chiba-shi
  • I.A. Seleznev, E. Syresin
    JINR, Dubna, Moscow Region
 
  The ion cooler ring S-LSR has been constructed and commissioned in October 2005. The ring successfully stored a 7 MeV proton beam. The S-LSR is equipped with a compact-electron cooler which has a cooling solenoid length of 0.8 m, a toroid bending radius of 0.25 m and maximum magnetic field in the cooling section of 0.5 kG. The commissioning of the electron cooler was carried out with successful observation of both longitudinal and horizontal cooling of the proton beam. By varying the electric potential on the Pierce electrode in the gun, we have investigated the possibility of generating a hollow shaped electron beam, and studied its effect on the electron cooling process. Also the effect of the electrostatic deflector, installed in the toroid section in order to compensate the drift motion of the secondary electrons, was investigated. The design and results of the commissioning of the compact electron cooler are presented.  
TUPLS065 Beam Commissioning of Ion Cooler Ring, S-LSR 1642
 
  • T. Shirai, S. Fujimoto, M. Ikegami, A. Noda, H. Souda, M. Tanabe, H. Tongu
    Kyoto ICR, Uji, Kyoto
  • H. Fadil
    MPI-K, Heidelberg
  • T. Fujimoto, H. Fujiwara, S.I. Iwata, S. Shibuya
    AEC, Chiba
  • I.N. Meshkov, I.A. Seleznev, A.V. Smirnov, E. Syresin
    JINR, Dubna, Moscow Region
  • K. Noda
    NIRS, Chiba-shi
 
  S-LSR is a new ion cooler ring constructed in Kyoto University. The circumference is 22.557 m and the maximum magnetic rigidity is 1 Tm. The constructiion and the vacuum baking had been finished in September, 2005. The beam commissioning was started since October, 2005. The injected beam is 7 MeV proton from the existing linac. The beam circulation test and the electron beam cooling were carried out successfully and the beam information and the characteristics of the ring were measured. One of the subjects of S-LSR is a realization of the crystalline beams using the electron and laser cooling. The lattice of S-LSR was designed to suppress the beam heating as much as possible and we also present such measurement results in this paper.  
THPCH155 High-quality Proton Beam Obtained by Combination of Phase Rotation and the Irradiation of the Intense Short-pulse Laser 3158
 
  • S. Nakamura, Y. Iwashita, A. Noda, T. Shirai, H. Souda, H. Tongu
    Kyoto ICR, Uji, Kyoto
  • S. Bulanov, T. Esirkepov, Y. Hayashi, M. Kado, T. Kimura, M. Mori, A. Nagashima, M. Nishiuchi, K. Ogura, S. Orimo, A. Pirozhkov, A. Sagisaka, A. Yogo
    JAEA, Ibaraki-ken
  • H. Daido, A. Fukumi
    JAEA/Kansai, Kizu-machi Souraku-gun Kyoto-fu
  • Z. Li
    NIRS, Chiba-shi
  • A. Ogata, Y. Wada
    HU/AdSM, Higashi-Hiroshima
  • T. Tajima
    JAEA/FEL, Ibaraki-ken
  • T. Takeuchi
    AEC, Chiba
 
  Ion production from laser-induced plasma has been paid attention because of its high acceleration gradient (>100GeV/m) compared with conventional RF accelerator. Its energy spectrum is Maxwell-Boltzmann distribution with high-energy cut-off, which limited its application. The phase rotation scheme, which rotates laser produced ions by an RF electric field synchronous to the pulse laser in the longitudinal phase space, was applied to proton beam up to 0.9MeV emitted from Ti foil with 3mm thickness irradiated by focused laser-pulse with peak intensity of 9 ´ 1017W/cm2. Multi-peaks with ~6% width (FWHM) were created and intensity multiplication up to 5 was attained around 0.6MeV region. The proton production process by the intense short-pulse laser has been optimized with use of time of flight measurement of proton beam detected by a plastic scintillation counter, which is specially shielded from the heavy background of electrons and X-rays induced by the intense laser. We have succeeded in on-line measurement of such a proton signal by the detector for the first time, which played an essential role for the investigation of phase rotation scheme.