Resistive interchange modes destabilized by helically trapped energetic ions in a helical plasma

X. D. Du, K. Toi, M. Osakabe, S. Ohdachi, T. Ido, K. Tanaka, M. Yokoyama, M. Yoshinuma, K. Ogawa, K. Y. Watanabe, M. Isobe, K. Nagaoka, T. Ozaki, S. Sakakibara, R. Seki, A. Shimizu, Y. Suzuki, H. Tsuchiya

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Abstract

A new bursting m=1/n=1 instability (m,n: poloidal and toroidal mode numbers) with rapid frequency chirping down has been observed for the first time in a helical plasma with intense perpendicular neutral beam injection. This is destabilized in the plasma peripheral region by resonant interaction between helically trapped energetic ions and the resistive interchange mode. A large radial electric field is induced near the edge due to enhanced radial transport of the trapped energetic ions by the mode, and leads to clear change in toroidal plasma flow, suppression of microturbulence, and triggering an improvement of bulk plasma confinement.

Original languageEnglish
Article number155003
JournalPhysical Review Letters
Volume114
Issue number15
DOIs
Publication statusPublished - Apr 17 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Du, X. D., Toi, K., Osakabe, M., Ohdachi, S., Ido, T., Tanaka, K., Yokoyama, M., Yoshinuma, M., Ogawa, K., Watanabe, K. Y., Isobe, M., Nagaoka, K., Ozaki, T., Sakakibara, S., Seki, R., Shimizu, A., Suzuki, Y., & Tsuchiya, H. (2015). Resistive interchange modes destabilized by helically trapped energetic ions in a helical plasma. Physical Review Letters, 114(15), [155003]. https://doi.org/10.1103/PhysRevLett.114.155003