@techreport{oai:nifs-repository.repo.nii.ac.jp:00010332, author = {"Toi, K. and Takechi, M. and Takagi, S. and Matsunaga, G. and Isobe, M. and Kondo, T. and Sasao, M. and Darrow, D.S. and Ohkuni, K. and Ohdachi, S. and Akiyama, R. and Gotoh, M. and Idei, H. and Ida, K. and Iguchi, H. and Kado, S. and Kojima, M. and Kubo, S. and Lee, S. and Matsuoka, K. and Minami, T. and Morita, S. and Nikai, N. and Nishimura, S. and Okamura, S. and Osakabe, M. and Shimizu, A. and Shirai, Y. and Takahashi, C. and Tanaka, K. and Watari, T. and Fujisawa, A. and Yoshimura, Y."}, month = {Oct}, note = {"In NBI heated plasmas of the CHS heliotron/torsatron where the beam driven current with a peaked profile is induced, m=2/n=1 and m=3/n=2(m,n : poloidal and toroidal mode numbers) fishbone instabilities are observed for the first time. Pulsed increase in energetic ion loss flux is detected by an escaping ion probe during the m=3/n=2 mode. The sawtooth crash is often induced by the m=2/n=1 mode. The current driven internal kink mode is thought to be destabilized by the presence of energetic ions, having a character of pressure driven interchange mode. Toroidal Alfven eigenmodes(TAEs) with n=1 and n=2 are also identified for the first time in NBI heated plasmas. TAEs localize near the plasma core region with fairly low magnetic shear realized by the small net plasma current, and do not lead to enhanced loss of energetic ions because of low fluctuation level."}, title = {Global MHD Modes Excited by Energetic Ions in Heliotron/Torsatron Plasmas}, year = {1998} }