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Noda, A.

Paper Title Page
TUPP093 Crystalline Beam Simulations 1747
 
  • D. A. Krestnikov
    JINR/DLNP, Dubna, Moscow region
  • M. Grieser
    MPI-K, Heidelberg
  • M. Ikegami
    JAEA/Kansai, Kizu-machi Souraku-gun Kyoto-fu
  • I. N. Meshkov, A. O. Sidorin, A. V. Smirnov, G. V. Trubnikov
    JINR, Dubna, Moscow Region
  • M. Nakao, A. Noda, H. Souda, H. Tongu
    Kyoto ICR, Uji, Kyoto
  • K. Noda, T. Shirai
    NIRS, Chiba-shi
 
  A new program code was elaborated for the simulation of crystalline beams on the S-LSR storage ring (Kyoto Univ., Japan) under action of the cooling system. For the investigation of ordered proton beams, which recently were observed in first time on S-LSR, a special molecular dynamics technique was used. This article presents results of the numerical simulation and comparison with experimental data.  
THPP050 Recent Status of Laser Cooling for Mg Realized at S-LSR 3476
 
  • A. Noda, M. Ikegami, T. Ishikawa, M. Nakao, T. Shirai, H. Souda, M. Tanabe, H. Tongu, A. Wakita
    Kyoto ICR, Uji, Kyoto
  • M. Grieser
    MPI-K, Heidelberg
  • I. N. Meshkov, A. V. Smirnov
    JINR, Dubna, Moscow Region
  • K. Noda
    NIRS, Chiba-shi
 
  At an ion storage and cooler ring, S-LSR, a laser cooling has been applied to the 40 keV 24Mg+ ion beam guiding a laser with the wave length of 280nm parallel to the ion beam together with the deceleration by an induction voltage. Up to now, the longitudinal temperature has been cooled down to 3.6 Kelvin for the ion number of 3x104 although the transverse one still remains around 500 Kelvin. The longitudinal temperature is limited by the heat transfer from the transverse degree of freedom through intra-beam scattering, which becomes stronger according to increase of ion number. It is found that the equilibrium longitudinal temperature is linearly coupled with the transverse one* for our experimental condition up to now. In the present paper, recent experimental data will be presented together with the procedure of beam diagnosis with the use of optical methods using a spontaneous emission of the Mg ions. Possible approach to realize the resonant coupling through synchro-betatron coupling** is also to be presented.

* M. Tanabe et al., To be published in Applied Physics Express (APEX).
** Okamoto, A. M. Sessler, D Möhl, Phys. Rev. Lett. 72 (1994)3977.

 
THPP053 One-dimensional Ordering of Protons by the Electron Cooling 3485
 
  • T. Shirai, M. Ikegami, A. Noda, H. Souda, M. Tanabe, H. Tongu
    Kyoto ICR, Uji, Kyoto
  • M. Grieser
    MPI-K, Heidelberg
  • I. N. Meshkov, A. V. Smirnov
    JINR, Dubna, Moscow Region
  • K. Noda
    NIRS, Chiba-shi
 
  One of the main subjects of the compact cooler ring, S-LSR at Kyoto University is the physics of the ultra cold ion beam, such as the ordered beam and the crystalline beam, using the electron and laser cooling. The one-dimensional ordering of protons has been studied at S-LSR, while the ordering the highly charged heavy ions has been found at ESR and CRYRING. Abrupt jumps in the momentum spread and the Schottky noise power have been observed for protons at a particle number of around 2000. The beam temperature was 0.17 meV and 1 meV in the longitudinal and transverse directions at the transition, respectively. The normalized transition temperature of protons is close to those of heavy ions at ESR. The lowest longitudinal beam temperature below the transition was 0.3 K. It is close to the longitudinal electron temperature. The dependence of the ordering conditions on the betatron tune and the transverse beam temperature have been also studied. These results will be presented in the presentation.  
THPP054 Laser Cooling of Bunched Ion Beam at S-LSR 3488
 
  • H. Souda, M. Ikegami, T. Ishikawa, M. Nakao, A. Noda, T. Shirai, M. Tanabe, H. Tongu, A. Wakita, M. Yamada
    Kyoto ICR, Uji, Kyoto
 
  S-LSR is an ion storage ring equipped with an electron cooler and a laser cooling system. The laser cooling experiments of coasting beams were carried out during last year*. Now we started bunched beam laser cooling. 40keV Mg+ beams are bunched by an untuned RF cavity for harmonic number 5-50, and is cooled by a single 280nm laser. Bunch length are measured by electrostatic pickups. When RF harmonic number is five, bunch lengths is shorten from 1m to under 0.14m by laser cooling. Since the bunch length after cooling is shorter than present monitor resolution, fluorescence measurement is in preparation. We have installed another small RF cavity for harmonic number 100. Synchrotron-betatron coupling will be induced by dispersion at the place of this cavity**. This effect is expected to realize three dimensional laser cooling. In this paper we present the result of bunched beam cooling and the trial to three dimensional laser cooling.

*M. Tanabe et al. Appl. Phys. Express, in press.
**H. Okamoto. Phys. Rev. E 50, 4982 (1994).