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Report No.

Synchrotron oscillation relevant to transverse laser cooling in S-LSR

Jimbo, Koichi*; Soda, Hikaru*; Nakao, Masao*; Yuri, Yosuke; Tongu, Hiromu*; Noda, Akira*

A bunched 40-keV Mg$$^+$$ beam at an ion storage/cooler ring, S-LSR, Kyoto University, was cooled transversely through synchro-betatron coupling by a co-propagating laser. The cooled ion beams were optically diagnosed with spontaneous emission in the experiment. As the number of ions is smaller in the beam, however, it is more difficult to observe light emitted from the beam. The synchrotron-oscillation signals induced on a parallel-plate pickup were, therefore, investigated spectroscopically to see whether they were useful for beam diagnostics. We discuss the space charge effect of the signals. It is expected that, if the beam temperature is decreased drastically, the space charge effect is enhanced and the peaks related to the synchrotron oscillation are consequently suppressed.



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