1. Resonance coupling induced enhancement of indirect transverse cooling in a laser-cooled ion beam
- Author
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Akira Noda, Hiromi Okamoto, T.Hiromasa, Manfred Grieser, T. Shirai, Masao Nakao, Takehiro Ishikawa, Hiromu Tongu, Alexander Smirnov, Kouichi Jimbo, M. Tanabe, and Hikaru Souda
- Subjects
Physics ,Nuclear and High Energy Physics ,Physics and Astronomy (miscellaneous) ,Ion beam ,Resonance ,Surfaces and Interfaces ,Laser ,Coupling (probability) ,Synchrotron ,law.invention ,law ,Laser cooling ,lcsh:QC770-798 ,Physics::Accelerator Physics ,lcsh:Nuclear and particle physics. Atomic energy. Radioactivity ,Physics::Atomic Physics ,Atomic physics ,Ground state ,Beam (structure) - Abstract
We report the first observation of indirect resonantly enhanced transverse laser cooling of a bunched, stored ion beam of 40 keV $^{24}\mathrm{Mg}^{+}$. The longitudinal velocity distribution and the horizontal beam size of the laser-cooled $^{24}\mathrm{Mg}^{+}$ ion beam with 280 nm 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 (${\ensuremath{\nu}}_{s}$) 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 ${\ensuremath{\nu}}_{s}=0.068$, 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.
- Published
- 2012