Discovery of electric pulsation in a toroidal helical plasma

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. TakagiA. Ejiri, C. Takahashi, M. Kojima, S. Hidekuma, K. Ida, S. Nishimura, M. Isobe, N. Inoue, R. Sakamoto, S. I. Itoh, Y. Hamada, M. Fujiwara

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)


A pulsating behavior of the electrostatic potential has been discovered in a low-density, high-electron-temperature plasma of the CHS heliotron/torsatron. The potential profiles were observed to swing repeatedly between two distinctive states in a constant external magnetic field under a continuous supply of particles and energy. The change of the potential profile, which occurs on a much faster time scale (microseconds) than the diffusive time scale (milliseconds), is accompanied by changes in density and temperature. This discovery clearly demonstrates that even in a low beta regime a toroidal helical plasma can produce a self-sustaining dynamic steady state, like the sawtooth oscillation in tokamaks.

Original languageEnglish
Pages (from-to)2256-2259
Number of pages4
JournalPhysical review letters
Issue number11
Publication statusPublished - Sept 14 1998

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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