Effects of the Spatial Extent of Multiple Harmonic Layers
Authors: J. W. Burby, G. J. Kramer, C. K. Phillips and E. J. Valeo
Abstract:
An analytic model for single particle motion in the presence of a wave field and multiple
cyclotron harmonics is developed and investigated. The model suggests that even in the absence of
Doppler broadening, cyclotron harmonic layers have finite spatial extent. This allows for particles to
interact with more than one harmonic layer simultaneously, provided the layers are tightly packed.
The latter phenomenon is investigated in the context of the model using symplectic mapping
techniques. Then the model behavior is compared with numerical simulations of neutral beam
particle trajectories in NSTX using the full-orbit code SPIRAL.
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Submitted to: AIP Conference Proceedings for the 19th Topical Conference on Radio Frequency Power in Plasmas
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Download PPPL-4657 (pdf 569 KB 4 pp)
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