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

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 bet...

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Bibliographic Details
Published in:Physical review letters 2015-04, Vol.114 (15), p.155003-155003, Article 155003
Main Authors: 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
Format: Article
Language:English
Subjects:
Bulk transporters
Bursting
Confinement
Helical
Instability
Neutral beams
Stability
Transport
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.114.155003