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- Title
Self-regulated oscillation of transport and topology of magnetic islands in toroidal plasmas.
- Authors
Ida, K.; Kobayashi, T.; Evans, T. E.; Inagaki, S.; Austin, M. E.; Shafer, M. W.; Ohdachi, S.; Suzuki, Y.; Itoh, S.-I.; Itoh, K.
- Abstract
The coupling between the transport and magnetic topology is an important issue because the structure of magnetic islands, embedded in a toroidal equilibrium field, depends on the nature of the transport at the edge of the islands. Measurements of modulated heat pulse propagation in the DIII-D tokamak have revealed the existence of self-regulated oscillations in the radial energy transport into magnetic islands that are indicative of bifurcations in the island structure and transport near the q = 2 surface. Large amplitude heat pulses are seen in one state followed by small amplitude pulses later in the discharge resulting in a repeating cycle of island states. These two states are interpreted as a bifurcation of magnetic island with high and low heat pulse accessibility. This report describes the discovery of a bifurcation in the coupled dynamics between the transport and topology of magnetic islands in tokamak plasmas.
- Subjects
TOROIDAL plasma; HEAT pulses; TOKAMAKS; MAGNETIC structure; ELECTRON cyclotron resonance heating
- Publication
Scientific Reports, 2015, p16165
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/srep16165