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Author(s):
A. Fujisawa, H. Iguchi, H. Idei, S. Kubo, K. Matsuoka, S. Okamura, K. Tanaka, T. Minami, S. Ohdachi, S. Morita, H. Zushi, S. Lee, M. Osakabe, R. Akiyama, Y. Yoshimura, K. Toi, H. Sanuki, K. Itoh, A. Shimizu, S. Takagi, A. Ejiri, C. Takahashi, M. Kojima, S. Hidekuma, K. Ida, S. Nishimura, N. Inoue, R. Sakamoto, S.-I. Itoh, Y. Hamada and M. Fujiwara
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Title:
Discovery of Electric Pulsation in a Toroidal Helical Plasma
Date of publication:
Jan. 1998
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Key words:
self-organized pulsation, potential, electric field, bifurcation, transition, toroidal helical plasmas, nonlinearity, multiple steady states
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Abstract:
A-self-organized pulsation in electrostatic potential has been discovered in a low density plasma of CHS heliotron/torsatron with combined ECH+NBI heating. The potential profiles repeat transition between two distinctive states (Delta phi(0) ~ 0.5T_e ~ 0.6kV) in a constantexternal magnetic field when there is a continuous supply of particles and energy. Each transition, which occurs on microseconds time scale that is much faster than the diffusive one of milliseconds, is accompanied with drastic changes in density and temperature profiles. This discovery clearly demonstrates that spontaneously generated 'electric' field can affect transports and other properties of 'magnetically' confined plasmas.
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