  A kinetic formalism of parametric decay of a large amplitude lower hybrid
pump wave into runaway electron mode and a uppersideband 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.
