Two-dimensional ion velocity diffusion due to ion-acoustic turbulence

Johnsen, H.; Fujita, Hiroharu; Armstrong, Richard J.

doi:10.1016/0375-9601(86)90719-x

Physics Letters A

1986

DOI: 10.1016/0375-9601(86)90719-x

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Two-dimensional ion velocity diffusion due to ion-acoustic turbulence

H. Johnsen

Hiroharu Fujita

Richard J. Armstrong

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1986

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Cited by 7 publications

References 10 publications

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Acceleration and heating in quasi-linear diffusion

Rypdal

1986

J. Plasma Phys.

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Quasi-linear diffusion of charged particles due to a stationary and homogeneous spectrum of electrostatic field fluctuations is investigated via a Fokker-Planck approach. The energy of a given distribution of test particles is found to be conserved whenever the wave spectrum is isotropic and none of the spectral components of the field has a phase speed that equals the speed of any test particle. Quite generally, the energy is monotonically increasing for isotropic spectra. An interesting quantum mechanical interpretation of these results is given, and the special case of beam evolution in an isotropic spectrum of non-dispersive waves is studied in some detail. Conditions for isotropization of directed electron and ion beams from Coulomb collisions and collective oscillations are discussed in the context of the quasi-linear description. Some promising results from a beam-plasma experiment are quoted.

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Acceleration and heating in quasi-linear diffusion

Rypdal

1986

J. Plasma Phys.

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Nondiffusive velocity broadening in ion energy analyzer operation

Fujita

Yagura

Rypdal

1988

Journal of Applied Physics

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Fluctuations in plasma potential bring about an apparent broadening in the ion energy distribution when it is derived from the I-V characteristic of a retarding grid energy analyzer. This effect may have detrimental consequences for the prospects of applying energy analyzers to measure diffusion of the background distribution when electrostatic turbulence is present. The effect is demonstrated by inducing spatially homogeneous oscillations of the plasma potential in a beam-plasma system, applying a directional ion energy analyzer for beam detection. A theoretical analysis is presented, and quantitative agreement with the experimental results is obtained.

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Observation of plasma production in a multipole device

Okuno

Yagura

Fujita

1990

Physics of Fluids B: Plasma Physics

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Plasma production is observed in a simple discharge model of one filament cathode and a multipole magnet anode with variable electrode separation. Two-dimensional velocity distribution functions of electrons and ions and two-dimensional spatial profiles of the potential and electron density are measured with a directional energy analyzer, an emissive probe, and a Langmuir probe. The electrode distance is found to affect the plasma production for isotropic velocity distribution, quiescent plasma, and homogeneous spatial distributions of the potential and electron density. The results may help to explain the fundamental plasma physics of a multipole double plasma machine.

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Two-dimensional ion velocity diffusion due to ion-acoustic turbulence

Cited by 7 publications

References 10 publications

Acceleration and heating in quasi-linear diffusion

Acceleration and heating in quasi-linear diffusion

Nondiffusive velocity broadening in ion energy analyzer operation

Observation of plasma production in a multipole device

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