摘要 :
Full text. In this work we summarize the results from experiments on electrostatic and magnetic fluctuations in tokamak plasmas. Spectral analyses show that these fluctuations are turbulent, having a broad spectrum of wavectors an...
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Full text. In this work we summarize the results from experiments on electrostatic and magnetic fluctuations in tokamak plasmas. Spectral analyses show that these fluctuations are turbulent, having a broad spectrum of wavectors and a broad spectrum of frequencies at each wavector. The electrostatic turbulence induces unexpected anomalous particle transport that deteriorates the plasma confinement. The relationship of these fluctuations to the current state of plasma theory is still unclear. Furthermore, we describe also attempts to control this plasma turbulence with external magnetic perturbations that create chaotic magnetic configurations. Accordingly, the magnetic field lines may become chaotic and then induce a Lagrangian diffusion. Moreover, to discuss nonlinear coupling and intermittency, we present results obtained by using numerical techniques as bi spectral and wavelet analyses. (author)
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摘要 :
Anomalous resistivity and turbulent heating of plasmas are reviewed. Current-driven turbulence is classified. Pulsed turbulent heating results and energy confinement in tokamak experiments are discussed. Investigations of current-...
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Anomalous resistivity and turbulent heating of plasmas are reviewed. Current-driven turbulence is classified. Pulsed turbulent heating results and energy confinement in tokamak experiments are discussed. Investigations of current-driven turbulence show the potential to heat plasmas to elevated temperatures in relatively small cross-section devices. Although it is shown to be possible to relax the technical requirements on the necessary electric field and the pulse length to acceptable values, the effect of energy generation near the plasma edge, the energy transport, the impurity influx, and the variation of the current profile are unknown for large-radius tokamaks. Heating of plasmas by quasi-stationary weakly turbulent states caused by moderate increases of the resistivity due to higher loop voltages could be envisaged.
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摘要 :
Research concerning electron cyclotron heating; plasma theory (stochastic effects, numerical plasma simulation); laser diagnostics; and plasma focus is summarized.
摘要 :
When the plasma outflow velocity relative to the critical surface is supersonic, compressional density profiles can form in the critical region. These compressions involve dissipative processes like those in collisionless shocks; ...
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When the plasma outflow velocity relative to the critical surface is supersonic, compressional density profiles can form in the critical region. These compressions involve dissipative processes like those in collisionless shocks; associated plasma instabilities and reflected ions may inhibit energy transport and enhance laser light absorption. (ERA citation 03:020507)
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摘要 :
Experimental research on plasma pinches; turbulent plasma heating; plasma diagnostics; gas blanket and Tokamaks; and electron cyclotron resonance heating is described. Theoretical investigations of magnetohydrodynamics; wave dynam...
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Experimental research on plasma pinches; turbulent plasma heating; plasma diagnostics; gas blanket and Tokamaks; and electron cyclotron resonance heating is described. Theoretical investigations of magnetohydrodynamics; wave dynamics; and transport problems are summarized.
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摘要 :
Experimental investigations of plasma pinches; turbulent heating in the TORTUR Tokamak; plasma diagnostics; cold plasma blankets; and electron cyclotron resonance heating are described. Theoretical investigations of magnetohydrody...
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Experimental investigations of plasma pinches; turbulent heating in the TORTUR Tokamak; plasma diagnostics; cold plasma blankets; and electron cyclotron resonance heating are described. Theoretical investigations of magnetohydrodynamics; wave dynamics; and transport problems are summarized.
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