A. Shimizu, T. Ido, M. Nishiura, S. Nakamura, M. Nakamura, H. Nakano, M. Yokoyama, N. Tamura, H. Takahashi, Y. Yoshimura, S. Kubo, T. Shimozuma, H. Igami, K. Ida, M. Yoshinuma, K. Nagaoka, I. Yamada, K. Narihara, K. Tanaka, K. Kawahata, S. Kato and LHD Group
Experimental Study of Potential Profile Formation in Large Helical Device
Date of publication:
22 IAEA Fusion Energy Conference, EXC/P4-11
The radial profile of potential, phi, in the core region of the Large Helical Device (LHD) was measured with a Heavy Ion Beam Probe (HIBP) in wide parameter area, in which radial electric field, E_r, could not be measured in previous experiments. The radial profiles of E_r were estimated from the differentiation of the experimental data of HIBP. These E_r profiles were compared with the calculation result from neoclassical theory, and the theoretical prediction almost coincided with the experimental data of E_r in the core region of LHD plasmas.