Improvement of plasma energy confinement in tokamak under radiative cooling of the edge plasma

Improvement of plasma energy confinement in the T-10 tokamak by injection of impurity gases was studied experimentally. Injection of Ne and He in the ohmic and ECR heating regimes allows one to separate the dependences of energy confinement on the plasma density and on the edge plasma cooling rate....

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Published inPlasma physics reports Vol. 43; no. 11; pp. 1043 - 1051
Main Authors Razumova, K. A., Borschegovskiy, A. A., Gorbunov, E. P., Dremin, M. M., Kasyanova, N. V., Kirneva, N. A., Kislov, A. Ya, Klyuchnikov, L. A., Krupin, V. A., Krylov, S. V., Lysenko, S. E., Melnikov, A. V., Myalton, T. B., Nemets, A. R., Notkin, G. E., Nurgaliev, M. R., Sarychev, D. V., Sushkov, A. V., Chistyakov, V. V., Ongena, J., Messiaen, A.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.11.2017
Springer Nature B.V
Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Atomic
Confinement
CONFINEMENT TIME
Cooling
Cooling rate
ELECTRON CYCLOTRON-RESONANCE
HEAT FLUX
Molecular
Optical and Plasma Physics
Physics
Physics and Astronomy
Plasma
Plasma cooling
PLASMA DENSITY
RADIATIVE COOLING
T-10 TOKAMAK
THERMODYNAMIC MODEL
THERMODYNAMICS
Tokamak devices
Tokamaks
Transport properties
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Summary:Improvement of plasma energy confinement in the T-10 tokamak by injection of impurity gases was studied experimentally. Injection of Ne and He in the ohmic and ECR heating regimes allows one to separate the dependences of energy confinement on the plasma density and on the edge plasma cooling rate. It is shown that the well-known dependence of the energy confinement time on the plasma density is, in fact, the dependence on the radiative loss power. This phenomenon can be explained by plasma self-organization. The experiments are described by a thermodynamic model for self-organized plasma in which the transport coefficient depends on the difference between the actual and self-consistent pressure profiles. The reduction in the heat flux at the plasma edge due to radiative cooling leads to a decrease in the transport coefficient in this region and, accordingly, improves energy confinement. Results of approximate model calculations for experiments with Ne injection are presented.
ISSN:1063-780X
1562-6938
DOI:10.1134/S1063780X1711006X