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Optics Express

Optics Express

  • Editor: J. H. Eberly
  • Vol. 2, Iss. 8 — Apr. 13, 1998
  • pp: 314–322

Doppler imaging of plasma modes in a Penning trap

T. B. Mitchell, J. J. Bollinger, X.-P. Huang, and W. M. Itano  »View Author Affiliations

Optics Express, Vol. 2, Issue 8, pp. 314-322 (1998)

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We describe a technique and present results for imaging the modes of a laser-cooled plasma of 9Be+ ions in a Penning trap. The modes are excited by sinusoidally time-varying potentials applied to the trap electrodes. They are imaged by changes in the ion resonance fluorescence produced by Doppler shifts from the coherent ion velocities of the mode. For the geometry and conditions of this experiment, the mode frequencies and eigenfunctions have been calculated analytically. A comparison between theory and experiment for some of the azimuthally symmetric modes shows good agreement.

© Optical Society of America

OCIS Codes
(120.7250) Instrumentation, measurement, and metrology : Velocimetry
(140.3320) Lasers and laser optics : Laser cooling
(300.6520) Spectroscopy : Spectroscopy, trapped ion
(350.5400) Other areas of optics : Plasmas

ToC Category:
Focus Issue: Collective phenomena in trapped atoms and ions

Original Manuscript: January 15, 1998
Published: April 13, 1998

Travis Mitchell, J. Bollinger, X.-P. Huang, and Wayne Itano, "Doppler imaging of plasma modes in a Penning trap," Opt. Express 2, 314-322 (1998)

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  21. Here ! lm is the mode frequency in a frame rotating with the plasma. For the m = 0 modes discussed here this distinction is not necessary because their frequency is the same in either the laboratory or rotating frame.
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