Laser cooling of relativistic heavy ion beams at storage rings is one of the most promising techniques to reach high phase-space densities and achieve a phase transition,an ordered beam,or even a crystalline beam.Compared with the established cooling schemes at storage rings,such as electron cooling and stochastic cooling,laser cooling rate is expected to be much higher and laser-cooled ion beams could reach ultra-low temperatures(~mK).The preparation of laser cooling of 280 MeV/u 16O^5+ion beams at the experimental cooler storage ring CSRe is in progress at the Institute of Modern Physics[1],Chinese Academy of Sciences.
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