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(EX/W-2) Heating and Current Drive by Electron Cyclotron Waves in JT-60U

T. Suzuki¹⁾, S. Ide¹⁾, C.C. Petty²⁾, Y. Ikeda¹⁾, K. Kajiwara¹⁾, A. Isayama¹⁾, K. Hamamatsu¹⁾, O. Naito¹⁾, M. Seki¹⁾, S. Moriyama¹⁾, JT-60 Team^1)
 
1) Japan Atomic Energy Research Institute, Naka, Japan
²⁾ General Atomics, San Diego, California, US

Abstract.  Results of studies on heating and current drive by the electron cyclotron (EC) waves in JT-60U are presented. Electron temperature by electron cyclotron emission up to 26 keV was achieved by injecting EC waves in the center of a reversed shear plasma produced by the lower hybrid (LH) waves. The electron temperature T_e exceeds 24 keV in a wide range of minor radius ($\rho$ < 0.3, where $\rho$ is the normalized minor radius). ECCD (Current Drive) efficiency $\eta$ was examined at high T_e up to 16 keV. The efficiency is found to be proportional to T_e at CD location within this range of T_e. Normalized CD efficiency $\zeta$ was 0.16. Dependence of $\zeta$ on deposition location was also studied to optimize the CD efficiency, since trapped particle effect, which depends strongly on deposition location, is expected to reduce $\zeta$. The effect was detected from significant decrease in $\zeta$ in the lower magnetic field deposition, which is consistent with linearlized Fokker-Planck calculation.

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