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(EX6/4) Characteristics of Internal Transport Barrier in JT-60U Reversed Shear Plasmas

Y. Sakamoto¹⁾, Y. Kamada¹⁾, S. Ide¹⁾, T. Fujita¹⁾, H. Shirai¹⁾, T. Takizuka¹⁾, Y. Koide¹⁾, T. Fukuda¹⁾, T. Oikawa¹⁾, T. Suzuki¹⁾, K. Shinohara¹⁾, R. Yoshino¹⁾ and the JT-60U Team^1)
 
1) Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Japan

Abstract.  Characteristics of internal transport barrier (ITB) structure are studied and the active ITB control has been developed in JT-60U reversed shear plasmas. The following results are found. Outward propagation of the ITB with steep T_i gradient is limited to the minimum safety factor location ( $\rho_{\mathrm{qmin}}^{}$). However the ITB with reduced T_i gradient can move to the outside of $\rho_{\mathrm{qmin}}^{}$. Lower boundary of ITB width is proportional to the ion poloidal gyroradius at the ITB center. Furthermore the demonstration of the active control of the ITB strength based on the modification of the radial electric field shear profile is successfully performed by the toroidal momentum injection in different directions or the increase of heating power by neutral beams.

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