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Resonant drift-wave coupling modified by nonlinear separatrix dissipation
A A Kabantsev1, T M O'Neil, Yu A Tsidulko
1Department of Physics, University of California at San Diego, La Jolla, California 92093, USA.
Abstract:
Resonant drift-wave coupling experiments characterize a new dissipative coupling term caused by a trapping separatrix. The system is a cylindrical pure-electron plasma with an axial trapping separatrix generated by an applied theta-symmetric wall voltage. The resonant decay of m_{theta}=2 diocotron modes into m_{theta}=1 trapped-particle diocotron modes is measured and compared to parametric mode coupling theory. Experiments quantify the traditional nonlinear mode coupling term, plus a new separatrix-generated dissipative coupling term which is not yet characterized theoretically.
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