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Spatiotemporal splitting of global eigenmodes due to cross-field coupling via vortex dynamics in drift wave
C Brandt1, S C Thakur2, A D Light3
1Center for Energy Research, University of California-San Diego, La Jolla, California 92093-0417, USA.
Abstract:
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≪fDW(-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×B-vortex convection cell dynamics and ion gyro radii motion leads to cross-field synchronization and occasional mode splitting events.
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