Gyrokinetic Particle-in-Cell Simulation of Spectral Cascade and Collisionless Dissipation in Kinetic Alfven Wave Turbulence

Details Gyrokinetic Particle-in-Cell Simulation of Spectral Cascade and Collisionless Dissipation in Kinetic Alfven Wave Turbulence Gyrokinetic Particle-in-Cell Simulation of Spectral Cascade and Collisionless Dissipation in Kinetic Alfven Wave Turbulence

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh53b2045c&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH53B-2045

Physics

Plasma Physics

[7827] Space Plasma Physics / Kinetic And Mhd Theory, [7863] Space Plasma Physics / Turbulence, [7867] Space Plasma Physics / Wave/Particle Interactions, [7868] Space Plasma Physics / Wave/Wave Interactions

Scientific paper

The issue of spectral cascade and plasma heating in Alfvenic turbulence is a major unsolved problem in plasma physics. The possible heating mechanisms depend on direction of spectral cascade, i.e. perpendicular vs. parallel, and could be Landau damping of kinetic Alfven waves (KAW), ion cyclotron resonant heating and the stochastic heating by dispersive Alfven waves. Our work is focusing on perpendicular cascade to KAW. A massively parallel 3D gyro-kinetic particle-in-cell (PIC) code is developed to study spectral cascading and dissipation of Alfvenic turbulence with fully self-consistent nonlinear kinetic effects. From the gyrokinetic simulation we observed a magnetic energy spectrum with an index of "-5/3" in the inertial range, which recovers MHD model results. We also observed a break point at ion gyro-scale followed by a steepened spectra around spatial length of 0.5 ion gyro-radius and decouple of the electric and magnetic energy spectrum arround 1.4 ion gyro-radius, which suggest that Landau damping of KAWs due to wave-particle resonance is a plausible mechanism of heating and collisionless dissipation complement with ion cyclotron resonance and nonlinear stochastic heating.

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