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 language | English |
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Article number | 092506 |
Pages (from-to) | 1-6 |
Number of pages | 6 |
Journal | Physics of Plasmas |
Volume | 12 |
Issue number | 9 |
DOIs | |
Publication status | Published - Sept 2005 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics