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Observation of fast-ion Doppler-shifted cyclotron resonance with shear Alfvén waves

Phys. Plasmas 15, 102112 (2008); doi:10.1063/1.2996323

Published 30 October 2008

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Yang Zhang,1 W. W. Heidbrink,1 H. Boehmer,1 R. McWilliams,1 S. Vincena,2 T. A. Carter,2 W. Gekelman,2 D. Leneman,2 and P. Pribyl2
1Department of Physics and Astronomy, University of California, Irvine, California 92697, USA
2Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
The Doppler-shifted cyclotron resonance (omega−kzvz=Omegaf) between fast ions and shear Alfvén waves is experimentally investigated (omega, wave frequency; kz, axial wavenumber; vz, fast-ion axial speed; Omegaf, fast-ion cyclotron frequency). A test particle beam of fast ions is launched by a Li+ source in the helium plasma of the LArge Plasma Device (LAPD) [W. Gekelman, H. Pfister, Z. Lucky, J. Bamber, D. Leneman, and J. Maggs, Rev. Sci. Instrum. 62, 2875 (1991)], with shear Alfvén waves (SAW) (amplitude delta B/B up to 1%) launched by a loop antenna. A collimated fast-ion energy analyzer measures the nonclassical spreading of the beam, which is proportional to the resonance with the wave. A resonance spectrum is observed by launching SAWs at 0.3–0.8omegaci. Both the magnitude and frequency dependence of the beam-spreading are in agreement with the theoretical prediction using a Monte Carlo Lorentz code that launches fast ions with an initial spread in real/velocity space and random phases relative to the wave. Measured wave magnetic field data are used in the simulation. ©2008 American Institute of Physics
History: Received 21 May 2008; accepted 17 September 2008; published 30 October 2008
Permalink: http://link.aip.org/link/?PHPAEN/15/102112/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.35.Bj
    Plasma magnetohydrodynamic waves
  • YEAR: 2008

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ISSN:
1070-664X (print)   1089-7674 (online)
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