Laser cooling is one of the most promising techniques to achieve high phase-space densities or even crystalline beams for relativistic heavy ion beams at storage rings[1].Based on the success of laser cooling of C^(3+) at the ESR[2,3],and the experience of test laser cooling experiments at the CSRe[4],laser cooling of lithium-like O^(5+) ion beams with an relativistic energy of 275.7 MeV/u was achieved for the first time at the heavy-ion storage ring CSRe in Lanzhou,China.In the experiment,a CW laser system with a wavelength of 220 nm was used to match the optical transition of 2s1=2-2p1=2 of O^(5+)ions.In order to cool the relativistic ion beams with only one counterpropagating CW laser,the ion beams were bunched by applying a sinusoidal voltage to the RF-buncher system.Fig.
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