Y. Nakamura, K. Y. Watanabe, K. Kawaoto, K. Ida, Y. Narushima, M. Yoshinuma, S. Sakakibara, I. Yamada, T. Tokuzawa, M. Goto, K. Tanaka, N. Nakajima, K. Kawahata and LHD experimental group


Time Evolution of the Bootstrap Current Profile in LHD Plasmas

Date of publication:

Oct. 2008

Key words:

21 IAEA Fusion Energy Conference, EX/P6-20


The direction of the bootstrap current is inverted in the outward shifted plasmas of the Large Helical Device (LHD). In order to verify the reliability of the theoretical models of the bootstrap current in helical plasmas, the rotational transform profiles are observed by the Motional Stark Effect measurement in the bootstrap current carrying plasmas of the LHD, and they are compared with the numerical simulations of the toroidal current profile including the bootstrap current. Since the toroidal current profile is not in the steady state in these plasmas, taking care of the inversely induced component of the toroidal current and finite duration of the resistive diffusion of the toroidal current are important in the numerical simulations. Reasonable agreement can be obtained between the rotational transform profiles measured in the experiments and those calculated in the numerical simulations

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