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Author(s):
K. Ida, S. Nishimura, T. Minami, K. Tanaka, S. Okamura, M. Osakabe, H. Idei, S. Kubo, C. Takahashi and K. Matsuoka
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Title:
High Ion Temperature Mode in CHS Heliotron/torsatron Plasmas
Date of publication:
Nov. 1997
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Key words:
High T_i mode, Compact Helical System, Improved mode, Density peaking, Radial electric field, Charge-exchange spectroscopy
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Abstract:
High ion temperature mode (high T_i mode) is observed for neutral beam heated plasmas in Compact Helical System (CHS) Heliotron/torsatron plasmas. The high T_i mode plasma is characterized by a peaked ion temperature profile and is associated with a peaked electron density profile produced by neutral beam fueling. The reduction of ion thermal diffusivity is observed at the plasma core (rho = 0.1) in the high T_i mode by a factor of two. The high T_i mode discharge is observed only in the low density and the upper limit of n_e (critical n_e) for the high T_i mode depends on the density peaking factor.
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