The Cerenkov wakes stimulated by various drivers (an intense laser pulse, a train of laser pulses or beats and a relativistic particle bunch) propagating transverse to a dc magnetic field in a plasma are analyzed. In each case, the wake generated couples to the electromagnetic radiation of approximate frequency ωp at the plasma-vacuum boundary. The radiation amplitude is ωc/ωp times the amplitude of the wake excited in the plasma (for a sharp boundary). Two- and three-dimensional particle-in-cell simulations are used to verify the scaling laws. For the parameters of current plasma wake field accelerator experiments the results predict that generation of high-power (GW) coherent microwave to terahertz radiation is possible.
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Spence et al. (2001) studied this question.
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