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(EX/P3-03) Role of q(r) Profile in the Transport Barriers Formation on T-10 Tokamak

K. A. Razumova¹⁾, A.A. Borschegovskii¹⁾, V.V. Chistyakov¹⁾, S.A. Grashin¹⁾, A.Ya. Kislov¹⁾, D.A. Krupin¹⁾, S.E. Lysenko¹⁾, V.G. Merezhkin¹⁾, T.B. Myalton¹⁾, G.E. Notkin¹⁾, Yu.D. Pavlov¹⁾, D.P. Petrov¹⁾, V.I. Poznyak¹⁾, M.V. Ossipenko¹⁾, I.N. Roi¹⁾, P.V. Savrukhin¹⁾, A.V. Sushkov¹⁾, V.M. Trukhin¹⁾, S.V. Tsaun¹⁾, V.A. Zhuravlev^1)
 
1) RRC ``Kurchatov Institute'', Nuclear Fusion Institute, Moscow, Russia

Abstract.  The role of radial q(r) profile in the transport barriers formation has been investigated on the T-10 tokamak. The experiments with the rapid current ramp-up (2 MA/s) during the stationary off-axis ECR plasma heating have been conducted. It was shown that the electron internal transport barrier (e-ITB) in the plasma core is formed, when the core is shifted inward owing to the current ramp-up. The e-ITB realization (increase of electron temperature gradient) begins with delay 10 ms after the ramp-up start. This is sufficiently earlier than the additional current density could be able to penetrate in the barrier zone. The regimes with the single internal barrier, with single external barrier and with simultaneous two barriers have been obtained. The extremely important role of the MHD configuration during the e-ITB formation is emphasized. Additional on-axis ECR heating demonstrates that enhanced heat flux also effective for the ITB development near given resonance surface.

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