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Recombinative plasma in electron runaway discharge

Kuznetsov, Yu. K. ; Galvão, R. M. O. ; Usuriaga, O. C. ; Krasheninnikov, S. I. ; Soboleva, T. K. ; Tsypin, V. S. ; Fonseca, A. M. M. ; Ruchko, L. F. ; Sanada, E. K.

Physics of plasmas, 2005-07, Vol.12 (7), p.072508-072508-10 [Periódico revisado por pares]

United States: American Institute of Physics

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Título:
Recombinative plasma in electron runaway discharge
Autor: Kuznetsov, Yu. K. ; Galvão, R. M. O. ; Usuriaga, O. C. ; Krasheninnikov, S. I. ; Soboleva, T. K. ; Tsypin, V. S. ; Fonseca, A. M. M. ; Ruchko, L. F. ; Sanada, E. K.
Assuntos: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY ; BREAKDOWN ; CHARGED-PARTICLE TRANSPORT ; ELECTRIC CURRENTS ; ELECTRON TEMPERATURE ; EXPERIMENTAL REACTORS ; ION TEMPERATURE ; LIMITERS ; PLASMA ; PLASMA DENSITY ; PLASMA DIAGNOSTICS ; PLASMA INSTABILITY ; RELAXATION ; RUNAWAY ELECTRONS ; TOKAMAK DEVICES ; VARIATIONS
É parte de: Physics of plasmas, 2005-07, Vol.12 (7), p.072508-072508-10
Descrição: Cold recombinative plasma is the basic feature of the new regime of runaway discharges recently discovered in the Tokamak Chauffage Alfvén Brésilien tokamak [R. M. O. Galvão et al. , Plasma Phys. Controlled Fusion 43, 1181 (2001)]. With low plasma temperature, the resistive plasma current and primary Dreicer process of runaway generation are strongly suppressed at the stationary phase of the discharge. In this case, the runaway avalanche, which has been recently recognized as a novel important mechanism for runaway electron generation in large tokamaks, such as International Thermonuclear Experimental Reactor, during disruptions, and for electric breakdown in matter, is the only mechanism responsible for toroidal current generation and can be easily observed. The measurement of plasma temperature by the usual methods is a difficult task in fully runaway discharges. In the present work, various indirect evidences for low-temperature recombinative plasma are presented. The direct observation of recombinative plasma is obtained as plasma detachment from the limiter. The model of cold recombinative plasma is also supported by measurements of plasma density and H α emission radial profiles, analysis of time variations of these parameters due to the relaxation instability, estimations of plasma resistivity from voltage spikes, and energy and particle balance calculations.
Editor: United States: American Institute of Physics
Idioma: Inglês

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Recombinative plasma in electron runaway discharge

Kuznetsov, Yu. K. ; Galvão, R. M. O. ; Usuriaga, O. C. ; Krasheninnikov, S. I. ; Soboleva, T. K. ; Tsypin, V. S. ; Fonseca, A. M. M. ; Ruchko, L. F. ; Sanada, E. K.

United States: American Institute of Physics

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