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(EXP5/16) H-mode Features under ECRH on T-10

Yu. V. Esipchuk¹⁾, V. V. Alikaev¹⁾, A. A. Borshegovskij¹⁾, V. Chistyakov¹⁾, Yu. Dnestrovskij¹⁾, M. Dremin¹⁾, S. Grashin¹⁾, L. Eliseev¹⁾, L. Khimchenko¹⁾, G. Kirnev¹⁾, N. Kirneva¹⁾, A. Kislov¹⁾, D. A. Kislov¹⁾, S. V. Krilov¹⁾, A. Melnikov¹⁾, T. Myalton¹⁾, G. Notkin¹⁾, Yu. D. Pavlov¹⁾, V. Poznyak¹⁾, I. Roy¹⁾, D. Shelukhin¹⁾, S. Soldatov¹⁾, A. Sushkov¹⁾, K. Tarasyan¹⁾, V. Trukhin¹⁾, E. Trukhina¹⁾, V. Vershkov^1)
 
1) NFI RRC ``Kurchatov Institute'', 123182, Kurchatov Sq., 1, Moscow, Russia

Abstract.  The main feature of the H-mode obtained on T-10 under ECRH (with HF power absorbed in the plasma P_ab = 0.8MW) is the spontaneous density $\bar{n}_{e}^{}$ increase at D_$\alpha$ intensity decrease (up to 4 times). This $\bar{n}_{e}^{}$ rise is the result of electron transport barrier formation in a narrow region ( $\Delta$r_H $\cong$ 3cm) near the limiter. Confinement enhancement in H-mode up to $\acute{I}_{L}^{}$ = $\tau_{E}^{H}$/$\tau_{E}^{L}$ $\cong$ 1.6 - 1.7 in general is the result of $\tau_{\AA}^{}$ $\sim$ $\bar{n}_{e}^{}$ dependence. The thermal transport barrier contribution to total confinement enhancement is small. Threshold power P_th^LH does not contradict ITER scaling. Maximal $\acute{I}_{L}^{}$ values are achieved at low q_L $\sim$ 2.2, i.e. the dependence P_th^LH(qL) exists under T-10 conditions. The results of the radial electric field and turbulence measurements are discussed.

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