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

K. A. Razumova; A. A. Borschegovskiy; E. P. Gorbunov; M. M. Dremin; N. V. Kasyanova; N. A. Kirneva; A. Ya. Kislov; L. A. Klyuchnikov; V. A. Krupin; S. V. Krylov; S. E. Lysenko; A. V. Melnikov; T. B. Myalton; A. R. Nemets; G. E. Notkin; M. R. Nurgaliev; D. V. Sarychev; A. V. Sushkov; V. V. Chistyakov; J. Ongena; A. Messiaen

doi:10.1134/S1063780X1711006X

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

Authors: Razumova K.A.¹, Borschegovskiy A.A.¹, Gorbunov E.P.¹, Dremin M.M.¹, Kasyanova N.V.¹, Kirneva N.A.¹^,2, Kislov A.Y.¹, Klyuchnikov L.A.¹, Krupin V.A.¹, Krylov S.V.¹, Lysenko S.E.¹, Melnikov A.V.¹^,2, Myalton T.B.¹, Nemets A.R.¹, Notkin G.E.¹, Nurgaliev M.R.¹, Sarychev D.V.¹, Sushkov A.V.¹, Chistyakov V.V.¹, Ongena J.³, Messiaen A.³
Affiliations:
1. National Research Center “Kurchatov Institute,”
2. National Research Nuclear University “MEPhI,”
3. Laboratory for Plasma Physics–ERM/KMS
Issue: Vol 43, No 11 (2017)
Pages: 1043-1051
Section: Tokamaks
URL: https://journals.rcsi.science/1063-780X/article/view/186271
DOI: https://doi.org/10.1134/S1063780X1711006X
ID: 186271

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Abstract

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.

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

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About the authors

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