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Okamoto, H.

Paper Title Page
WEAY06 Experimental Strategy for Realization of 3-D Beam Ordering with Use of Tapered Cooling at S-LSR 231
 
  • A. Noda, M. Ikegami, T. Shirai, H. Souda, M. Tanabe
    Kyoto ICR, Uji, Kyoto
  • K. Noda
    NIRS, Chiba-shi
  • H. Okamoto
    HU/AdSM, Higashi-Hiroshima
 
  At ICR, Kyoto University, an ion storage/cooler ring, S-LSR has been operated since the October, 2005. S-LSR has capability of dispersion free mode* throughout the whole circumference in order to avoid the shear heating** due to momentum dispersion of ion beam orbits. With such a mode, we need a special devise to develop necessary coupling between the longitudinal and transverse degrees of freedom for 3-dimensional laser cooling.*** A Wien Filter, in which the magnetic and electric fields overlap with strengths compensating each other for ions with a certain velocity, is to be utilized in the straight section where the usual laser cooling is applied. Due to the potential difference caused by the electric field in the Wien Filter, the difference in horizontal position of the circulating ion creates the difference of the equillibrium energy after laser cooling, which realizes "Tapered Cooling"****. In the present paper, a possible strategy of experimental approach at S-LSR toward 3-dimensional crystalline ion beams with use of the Wien Filter is to be presented.

* M. Ikegami et al., PR-STAB,7, 120101(2004).
** A. Rahman and J. P. Schiffer, PRL, 57, 1133(1986).
*** H. Okamoto et al., PRL 72, 3977-3980 (1994).
**** J. Wei et al., PRL 80, 2606-2609 (1998).