Laboratory Experiments on the Interaction of Waves and Energetic Particles relevant to the earth's radiation belts.

Details Laboratory Experiments on the Interaction of Waves and Energetic Particles relevant to the earth's radiation belts. Laboratory Experiments on the Interaction of Waves and Energetic Particles relevant to the earth's radiation belts.

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm23c..01g&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM23C-01

Physics

Plasma Physics

[2720] Magnetospheric Physics / Energetic Particles: Trapped, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [7831] Space Plasma Physics / Laboratory Studies And Experimental Techniques, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

Laboratory experiments when carefully scaled can accurately model processes, which occur in space. This involves matching scaled parameters such as fpe/fce, fwave/fLH, λ⊥/δ, ... and ratios of scale lengths. Several experimental collaborations on the interaction of waves with fast particles an structures in plasma are underway at UCLA. In one series of experiments electrons generated by high power microwaves with v⊥/v|| >> 1 were done in a magnetic mirror geometry with a background plasma ( ne ˜ 1012, Te ˜ 1 eV, Trep=1 Hz) . Both low temperature (Te = 100 eV) and high energy (E > 100 keV) electrons are effectively scattered into the loss cone by shear Alfvén waves launched with an antenna. The high energy electrons loss and modulation at fA is observed by X-ray detectors outside the vacuum vessel. Detailed measurements of the waves in three dimensions are made with probes that move throughout the experimental volume. In a related set of experiments an electron beam (Ebeam > 1 keV) is injected along or at an angle with respect to the background magnetic field. Their scattering by whistler waves is studied. A third set of experiments involves the interaction of lower hybrid and whistler waves with density striations. These are done in both the linear and nonlinear regimes. Detailed measurements and comparison with spacecraft observations and simulations will be presented. Work supported by the Dept. of Energy, The National Science Foundation, The Office of Naval Research and done at the Basic Plasma Science Facility at UCLA.

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