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

Yang Zhang; W. W. Heidbrink; H. Boehmer; R. McWilliams; S. Vincena; T. A. Carter; W. Gekelman; D. Leneman; P. Pribyl

doi:10.1063/1.2996323

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

Yang Zhang, W. W. Heidbrink, H. Boehmer, R. McWilliams, S. Vincena, T. A. Carter, W. Gekelman, D. Leneman, P. Pribyl

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

The Doppler-shifted cyclotron resonance (ω- _kz _vz = _f) between fast ions and shear Alfv́n waves is experimentally investigated (ω, wave frequency; _kz, axial wavenumber; _vz, fast-ion axial speed; _f, 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 Alfv́n waves (SAW) (amplitude δ 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 0.3-0.8 _ωci. 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.

Original language	English
Article number	102112
Journal	Physics of Plasmas
Volume	15
Issue number	10
DOIs	https://doi.org/10.1063/1.2996323
State	Published - 2008
Externally published	Yes

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title = "Observation of fast-ion Doppler-shifted cyclotron resonance with shear Alfv{\'e}n waves",

abstract = "The Doppler-shifted cyclotron resonance (ω- kz vz = f) between fast ions and shear Alf{\'v}n waves is experimentally investigated (ω, wave frequency; kz, axial wavenumber; vz, fast-ion axial speed; f, 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 Alf{\'v}n waves (SAW) (amplitude δ 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 0.3-0.8 ωci. 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.",

author = "Yang Zhang and Heidbrink, {W. W.} and H. Boehmer and R. McWilliams and S. Vincena and Carter, {T. A.} and W. Gekelman and D. Leneman and P. Pribyl",

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doi = "10.1063/1.2996323",

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volume = "15",

journal = "Physics of Plasmas",

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T1 - Observation of fast-ion Doppler-shifted cyclotron resonance with shear Alfvén waves

AU - Zhang, Yang

AU - Heidbrink, W. W.

AU - Boehmer, H.

AU - McWilliams, R.

AU - Vincena, S.

AU - Carter, T. A.

AU - Gekelman, W.

AU - Leneman, D.

AU - Pribyl, P.

PY - 2008

Y1 - 2008

N2 - The Doppler-shifted cyclotron resonance (ω- kz vz = f) between fast ions and shear Alfv́n waves is experimentally investigated (ω, wave frequency; kz, axial wavenumber; vz, fast-ion axial speed; f, 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 Alfv́n waves (SAW) (amplitude δ 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 0.3-0.8 ωci. 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.

AB - The Doppler-shifted cyclotron resonance (ω- kz vz = f) between fast ions and shear Alfv́n waves is experimentally investigated (ω, wave frequency; kz, axial wavenumber; vz, fast-ion axial speed; f, 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 Alfv́n waves (SAW) (amplitude δ 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 0.3-0.8 ωci. 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.

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

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