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

M. Nakao, T. Hiromasa, H. Souda, M. Tanabe, T. Ishikawa, H. Tongu, A. Noda, K. Jimbo, T. Shirai, M. Grieser, H. Okamoto, and A. V. Smirnov
Phys. Rev. ST Accel. Beams 15, 110102 – Published 30 November 2012

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 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 (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.

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  • Received 28 October 2011

DOI:https://doi.org/10.1103/PhysRevSTAB.15.110102

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Authors & Affiliations

M. Nakao*, T. Hiromasa, H. Souda, M. Tanabe, T. Ishikawa§, H. Tongu, and A. Noda

  • ICR, Kyoto University, Uji-city, Kyoto, Japan

K. Jimbo

  • IAE, Kyoto University, Uji-city, Kyoto, Japan

T. Shirai

  • NIRS, Chiba-city, Chiba, Japan

M. Grieser

  • MPI-K, Heidelberg, Germany

H. Okamoto

  • Graduate School of Advanced Science of Matter, Hiroshima University, Higashi-Hiroshima-city, Hiroshima, Japan

A. V. Smirnov

  • JINR, Dubna, Moscow Region, Russia

  • *nakao@kyticr.kuicr.kyoto-u.ac.jp
  • Present address: Mitsubishi Electric Corporation, Amagasaki-city, Hyogo, Japan.
  • Present address: NHK, Kitakyushu-city, Fukuoka, Japan.
  • §Present address: Shimadzu Corporation, Kyoto-city, Kyoto, Japan.

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Issue

Vol. 15, Iss. 11 — November 2012

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