Formation of electron transport barriers under ECR control of the q(r) profile in the T-10 tokamak |
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| Authors: | K A Razumova V V Alikaev I S Bondarenko A A Borschegovskii V A Vershkov A V Gorshkov Yu V Gott Yu N Dnestrovskij V V Dreval M M Dremin L G Eliseev G S Kirnev A Ya Kislov I V Klimanov A S Kozachok A D Komarov V A Krupin L I Krupnik S V Krylov S E Lysenko A A Medvedev A V Melnikov T B Myalton G E Notkin A Yu Novikov Yu D Pavlov D P Petrov V I Poznyak I N Roy P V Savrukhin V V Sannikov S V Soldatov A V Sushkov V M Trukhin S M Khrebtov V V Chistyakov D A Shelukhin |
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| Institution: | (1) Russian Research Centre Kurchatov Institute, pl. Kurchatova 1, Moscow, 123182, Russia;(2) Ukrainian Scientific Center Kharkov Institute of Physics and Technology, Kharkov, 61108, Ukraine |
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| Abstract: | Abstract-the formation of transport barriers under electron cyclotron resonance heating and current drive in the t-10 tokamak is studied. in regimes with off-axis co-eccd and q L <4 at the limiter, a spontaneous transition to improved confinement accompanied by the formation of two electron transport barriers is observed. the improvement resembles an L-H transition. It manifests itself as density growth, a decrease in the Dα emission intensity, and an increase in the central electron and ion temperatures. Two deep wells on the potential profile (the first one at r/a L ≈0.6, where a L is the limiter radius, and the second one near the edge) arise during the transition. the internal barrier is formed when dq/dr～0 with q≈1 in the barrier region. |
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