Resonance coupling induced enhancement of indirect transverse cooling in a laser-cooled ion beam

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Abstract

We report the first observation of indirect resonantly enhanced transverse laser cooling of a bunched, stored ion beam of 40 keV Mg+24. The longitudinal velocity distribution and the horizontal beam size of the laser-cooled Mg+24 ion beam with 280anm laser light were simultaneously observed by the use of standard fluorescence-based techniques. Keeping the operation point at (2.068, 1.105), the synchrotron tune (νs) was changed from 0.0376 to 0.1299. A strong decrease in the cooled horizontal beam size and a corresponding increase in the equilibrium cooled momentum spread were observed at the expected synchrobetatron resonance coupling condition of νs=0.068, which is the first observation of a resonantly induced coupling for enhanced indirect transverse laser cooling of an ion beam, and is an important step towards creating a crystalline ground state of the beam. © 2012 Published by the American Physical Society.

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Nakao, M., Hiromasa, T., Souda, H., Tanabe, M., Ishikawa, T., Tongu, H., … Smirnov, A. V. (2012). Resonance coupling induced enhancement of indirect transverse cooling in a laser-cooled ion beam. Physical Review Special Topics - Accelerators and Beams, 15(11). https://doi.org/10.1103/PhysRevSTAB.15.110102

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