Nonlinear nonresonant forces by radio-frequency waves in plasmas

Gao, Zhe; Fisch, Nathaniel J.; Qin, Hong; Myra, J. R.

doi:doi:10.1063/1.2775431

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Verification of gyrokinetic δf simulations of electron temperature gradient turbulence

The GEM gyrokinetic δf simulation code [ Y. Chen and S. Parker, J. Comput. Phys. 189, 463 (2003); Y. Chen and S. Parker, J. Comput. Phys.220, 839 (2007) ] is shown to reproduce electron temperature gradient turbulence at the benchmark operating point established in previous work [ W. M. Nevins, J. Candy, S. Cowley, T. Dannert, A. Dimits, W. Dorland, C. Estrada-Mila, G. W. Hammett, F. Jenko, M. J. Pueschel, and D. E. Shumaker, Phys. Plasmas 13, 122306 (2006) ]. The electron thermal transport i...

Filamentation instability in a quantum plasma

The growth rate of the filamentation instability triggered when a diluted cold electron beam passes through a cold plasma is evaluated using the quantum hydrodynamic equations. Compared with a cold fluid model, quantum effects reduce both the unstable wave vector domain and the maximum growth rate. Stabilization of large wave vector modes is always achieved, but significant reduction of the maximum growth rate depends on a dimensionless parameter that is provided. Although calculations are exte...

Nonresonant forces by applied rf waves in plasmas are analyzed. Along the background dc magnetic field, the force arises from the gradient of the ponderomotive potential. Only when the dc magnetic field is straight, however, is this parallel force completely consistent with that from the single particle picture, where the ponderomotive force depends on the gradients of rf fields only. Across the dc magnetic field, besides the ponderomotive force from the particle picture, additional Reynolds stress and polarization stress contribute to the total force. For waves with frequency much lower than the cyclotron frequency, the perpendicular forces from the particle and fluid pictures can have opposite signs. In plasmas with a symmetry angle (e.g., toroidal systems), nonresonant forces cannot drive net flow or current in the flux surface, but the radial force may influence macroscopic behavior of plasma. Moreover, nonresonant forces may drive flow or current in linear plasmas or in a localized region of toroidal plasmas.

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KEYWORDS and PACS

Keywords

plasma nonlinear waves, plasma toroidal confinement

PACS

52.35.Mw

Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.)
52.55.Wq

Current drive; helicity injection