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, and LHD Experiment Group
Phys. Rev. Lett. 114, 155003 – Published 17 April 2015

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.

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  • Received 20 June 2014

DOI:https://doi.org/10.1103/PhysRevLett.114.155003

© 2015 American Physical Society

Authors & Affiliations

X. D. Du1,*, K. Toi2, M. Osakabe1,2, S. Ohdachi1,2, T. Ido2, K. Tanaka2, M. Yokoyama1,2, M. Yoshinuma1,2, K. Ogawa2, K. Y. Watanabe2, M. Isobe1,2, K. Nagaoka1,2, T. Ozaki2, S. Sakakibara1,2, R. Seki2, A. Shimizu2, Y. Suzuki1,2, H. Tsuchiya2, and LHD Experiment Group

  • 1Department of Fusion Science, The Graduate University for Advanced Study, 509-5292 Toki, Japan
  • 2National Institute for Fusion Science, 509-5292 Toki, Japan

  • *Corresponding author. du.xiaodi@lhd.nifs.ac.jp

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Vol. 114, Iss. 15 — 17 April 2015

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