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
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Affiliations:
- National Research Center “Kurchatov Institute,”
- National Research Nuclear University “MEPhI,”
- 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
Cite item
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.
About the authors
K. A. Razumova
National Research Center “Kurchatov Institute,”
Author for correspondence.
Email: Razumova_KA@nrcki.ru
Russian Federation, Moscow, 123182
A. A. Borschegovskiy
National Research Center “Kurchatov Institute,”
Email: Razumova_KA@nrcki.ru
Russian Federation, Moscow, 123182
E. P. Gorbunov
National Research Center “Kurchatov Institute,”
Email: Razumova_KA@nrcki.ru
Russian Federation, Moscow, 123182
M. M. Dremin
National Research Center “Kurchatov Institute,”
Email: Razumova_KA@nrcki.ru
Russian Federation, Moscow, 123182
N. V. Kasyanova
National Research Center “Kurchatov Institute,”
Email: Razumova_KA@nrcki.ru
Russian Federation, Moscow, 123182
N. A. Kirneva
National Research Center “Kurchatov Institute,”; National Research Nuclear University “MEPhI,”
Email: Razumova_KA@nrcki.ru
Russian Federation, Moscow, 123182; Moscow, 115409
A. Ya. Kislov
National Research Center “Kurchatov Institute,”
Email: Razumova_KA@nrcki.ru
Russian Federation, Moscow, 123182
L. A. Klyuchnikov
National Research Center “Kurchatov Institute,”
Email: Razumova_KA@nrcki.ru
Russian Federation, Moscow, 123182
V. A. Krupin
National Research Center “Kurchatov Institute,”
Email: Razumova_KA@nrcki.ru
Russian Federation, Moscow, 123182
S. V. Krylov
National Research Center “Kurchatov Institute,”
Email: Razumova_KA@nrcki.ru
Russian Federation, Moscow, 123182
S. E. Lysenko
National Research Center “Kurchatov Institute,”
Email: Razumova_KA@nrcki.ru
Russian Federation, Moscow, 123182
A. V. Melnikov
National Research Center “Kurchatov Institute,”; National Research Nuclear University “MEPhI,”
Email: Razumova_KA@nrcki.ru
Russian Federation, Moscow, 123182; Moscow, 115409
T. B. Myalton
National Research Center “Kurchatov Institute,”
Email: Razumova_KA@nrcki.ru
Russian Federation, Moscow, 123182
A. R. Nemets
National Research Center “Kurchatov Institute,”
Email: Razumova_KA@nrcki.ru
Russian Federation, Moscow, 123182
G. E. Notkin
National Research Center “Kurchatov Institute,”
Email: Razumova_KA@nrcki.ru
Russian Federation, Moscow, 123182
M. R. Nurgaliev
National Research Center “Kurchatov Institute,”
Email: Razumova_KA@nrcki.ru
Russian Federation, Moscow, 123182
D. V. Sarychev
National Research Center “Kurchatov Institute,”
Email: Razumova_KA@nrcki.ru
Russian Federation, Moscow, 123182
A. V. Sushkov
National Research Center “Kurchatov Institute,”
Email: Razumova_KA@nrcki.ru
Russian Federation, Moscow, 123182
V. V. Chistyakov
National Research Center “Kurchatov Institute,”
Email: Razumova_KA@nrcki.ru
Russian Federation, Moscow, 123182
J. Ongena
Laboratory for Plasma Physics–ERM/KMS
Email: Razumova_KA@nrcki.ru
Belgium, Brussels
A. Messiaen
Laboratory for Plasma Physics–ERM/KMS
Email: Razumova_KA@nrcki.ru
Belgium, Brussels