Parametric upconversion of lower hybrid wave by runaway electrons in tokamak

Kuley, Animesh; Tripathi, V. K.
June 2010
Physics of Plasmas;Jun2010, Vol. 17 Issue 6, p062507
Academic Journal
A kinetic formalism of parametric decay of a large amplitude lower hybrid pump wave into runaway electron mode and an upper sideband mode is investigated. The pump and the sideband exert a ponderomotive force on runaway electrons, driving the runaway mode. The density perturbation associated with the latter beats with the oscillatory velocity due to the pump to produce the sideband. The finite parallel velocity spread of the runaway electrons turns the parametric instability into a stimulated Compton scattering process where growth rate scales as the square of the pump amplitude. The large phase velocity waves thus generated can potentially generate relativistic electrons.


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