6533b7d3fe1ef96bd125fe43

RESEARCH PRODUCT

Towards laser cooling of fast Be+ ions in the storage ring TSR

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Publisher Summary This chapter presents a clear understanding of laser-ion interactions under storage ring conditions to prepare the basis of laser cooling of fast-stored ion beams. In addition, the method of laser-induced fluorescence provides precise data for beam properties such as absolute velocity, momentum spread, and lifetime. 9Be+ ions stored in a heavy-ion storage ring are a promising species for laser cooling down to temperatures several orders of magnitude less than those reached for protons by electron cooling at the Novosibirsk ring. Short cooling times and microkelvin temperatures can be envisaged, where the structure of the ion beam is dominated by Coulomb repulsion. The chapter presents a schematic view of an experimental configuration where the light beam from a homemade frequency-doubled free-jet ring dye laser with typically 30 mW power in the ultraviolet propagated parallel to the ions. Two cylindrical high-voltage (HV) electrodes were installed in a 1.3 m long zone in the center of the straight ring section. The laser-ion interaction was monitored via the fluorescence emanating from inside the first HV cylinder, using a cooled photomultiplier operated in the single-photon counting mode. The experimental results indicated the production of a Bennett hole in the ion velocity distribution, thus providing an important step towards laser cooling of fast Be+ ions stored in a ring.