Turbulent heating of ions in a toroidal experiment

Hirose, Akira

doi:10.1063/1.1694681

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1976

1982

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Cited by 5 publications

References 4 publications

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1982

Handbook on Plasma Instabilities

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1982

Handbook on Plasma Instabilities

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Spectra of ion acoustic plasma instability

Ilić

1977

The Physics of Fluids

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An experimental study of ion acoustic plasma turbulence in a collision-dominated positive column is presented. Linear theory predictions, which include ion Landau damping and the effects of a dc electric field, are shown to agree with measured values of convective growth rates. At high levels of turbulence, interferometric methods are not useful for studying the wave phase characteristics. Instead, the detailed spectral density for two-dimensional wave propagation, S (k,ω), is obtained by performing a two-dimensional spatial Fourier transform on sampled values of the frequency sweeps of the complex cross-power spectral density. The instability is found to be essentially one-dimensional, with the waves propagating along the direction of the electron drift velocity. The spectra are integrated numerically, and the energy density obtained is discussed in terms of two nonlinear models of saturated state of the instability. Time- and frequency-resolved power spectra are measured by sampling techniques, and compared to the predictions of linear theory. Temporal evolution of the phase characteristics is measured by a novel diagnostic technique.

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Turbulent heating of a large toroidal plasma

1976

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Consideration is given to some of the scaling problems involved in the application of turbulent heating to much larger toroidal systems than those employed up to now. Single-pulse heating is studied in a model in which the time variation of the skin depth is allowed for and energy transport from the skin to the interior of the plasma maintains the poloidal beta factor, βp, at a constant value. With the total heating current limited to a value Im (for a safety factor q > 1), the ion acoustic instability can be generated only as long as the skin depth δ satisfies the condition δ < Im/(necs2πa) where n is the plasma density, cs the ion sound speed and a is the minor radius. Consequently, depending on the efficiency of the energy transport, it is not certain that single-pulse heating can raise the plasma temperature to that required for ignition of a fusion reactor, and some form of multiple-pulse-heating may be required.

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Turbulent heating of ions in a toroidal experiment

Abstract: Previous ion temperature measurements are interpreted in terms of the stochastic heating resulting from the finite correlation time τc ∼ 2π/ω) of the observed ion acoustic turbulence. The damping of the fluctuations appears to be provided largely by the ions.

Cited by 5 publications

References 4 publications

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References

Spectra of ion acoustic plasma instability

Turbulent heating of a large toroidal plasma

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