Heat pulse propagation across the rational surface in a large helical device plasma with counter-neutral beam injection

M. Yakovlev, S. Inagaki, T. Shimozuma, S. Kubo, T. Morisaki, Y. Nagayama, K. Kawahata, A. Komori

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Abstract

Core electron temperature profile flattening is observed in a large helical device [A. Iiyoshi Nucl. Fusion 39, 1245 (1999)] inward shifted plasma with counter-neutral beam injection. To study this phenomenon, heat pulse experiments are performed by on-axis electron cyclotron heating power modulation. A unique feature of heat pulse propagation is observed near the mn=21 rational surface (m, n are the poloidal and toroidal mode numbers, respectively). A simultaneous response of the temperature perturbation on radially separated flux surfaces is shown. The change in the magnetic field topology due to the presence of a magnetic island structure can explain this nonmonotonic heat pulse propagation. The estimated O-point position of the island is located near the mn=21 rational surface.

Original languageEnglish
Article number092506
Pages (from-to)1-6
Number of pages6
JournalPhysics of Plasmas
Volume12
Issue number9
DOIs
Publication statusPublished - Sep 2005

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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    Yakovlev, M., Inagaki, S., Shimozuma, T., Kubo, S., Morisaki, T., Nagayama, Y., Kawahata, K., & Komori, A. (2005). Heat pulse propagation across the rational surface in a large helical device plasma with counter-neutral beam injection. Physics of Plasmas, 12(9), 1-6. [092506]. https://doi.org/10.1063/1.2044447