Experimental study of high density plasma operation in Heliotron

S. Kobayashi, T. Mizuuchi, Y. Nakashima, K. Nagasaki, H. Okada, T. Minami, S. Kado, S. Yamamoto, S. Ohshima, H. Y. Lee, L. Zang, Y. Nagae, H. Fukushima, K. Watanabe, R. Seki, K. Tanaka, S. Murakami, Y. Suzuki, K. Mukai, Y. Nakamura, S. Konoshima, K. Yaguchi, T. Senju, M. Shibano, K. Toushi, K. Sakamoto, F. Sano 1 Institute of Advanced Energy, Kyoto Univ., Uji, Kyoto 611-0011, JAPAN 2 Plasma Research Center, Univ. of Tsukuba, Tsukuba, Ibaraki 305-8577, JAPAN 3 Graduate School of Energy Science, Kyoto Univ., Uji, Kyoto 611-0011, JAPAN 4 National Institute for Fusion Science, Toki, Gifu 509-5292, JAPAN 5 Graduate School of Engineering, Kyoto Univ., Kyoto 606-8501, JAPAN