Electrostatic solitary waves generated by beam injection in LAPD

Details Electrostatic solitary waves generated by beam injection in LAPD Electrostatic solitary waves generated by beam injection in LAPD

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm11c..03c&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM11C-03

Physics

[2471] Ionosphere / Plasma Waves And Instabilities, [2712] Magnetospheric Physics / Electric Fields, [2772] Magnetospheric Physics / Plasma Waves And Instabilities

Scientific paper

Spacecraft data have revealed that electrostatic solitary waves are ubiquitous in non-equilibrium collisionless space plasmas. These solitary waves are often the main constituents of the observed electrostatic turbulence. The ubiquitous presence of these solitary waves in space motivated laboratory studies on their generation and evolution in the Large Plasma Device (LAPD) at UCLA. In order to observe these structures, microprobes with scale sizes of order of the Debye length (30 microns) had to be built using Mems technology. A suprathermal electron beam was injected into the afterglow plasma, and solitary waves as well as nonlinear wave packets were measured. The solitary waves are interpreted as BGK electron holes based on their width, amplitude, and velocity characteristics. The ensuing turbulence, including the solitary waves and wave packets, exhibits a band dispersion relation with its central line consistent with the electrostatic whistler mode. One surprise brought by the laboratory experiments is that the electron holes were not generated through resonant two-stream instabilities, but likely through an instability due to parallel currents. The characteristics of the LAPD electron holes and those observed in space will be compared to motivate further theoretical, simulation, and experimental work.

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