| Autor: |
Saikat Chakraborty Thakur, Christian Brandt, Jose Negrete, Adam Light, George Tynan |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Physical review letters. 113(26) |
| ISSN: |
1079-7114 |
| Popis: |
Spatiotemporal splitting events of drift wave (DW) eigenmodes due to nonlinear coupling are investigated in a cylindrical helicon plasma device. DW eigenmodes in the radial-azimuthal cross section have been experimentally observed to split at radial locations and recombine into the global eigenmode with a time shorter than the typical DW period ($t\ensuremath{\ll}{f}_{\text{DW}}^{\ensuremath{-}1}$). The number of splits correlates with the increase of turbulence. The observed dynamics can be theoretically reproduced by a Kuramoto-type model of a network of radially coupled azimuthal eigenmodes. Coupling by $E\ifmmode\times\else\texttimes\fi{}B$---vortex convection cell dynamics and ion gyro radii motion leads to cross-field synchronization and occasional mode splitting events. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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