Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm41b0566l&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM41B-0566
Physics
0654 Plasmas, 0664 Reflectors And Feeds, 0689 Wave Propagation (4275), 2427 Ionosphere/Atmosphere Interactions (0335), 2471 Plasma Waves And Instabilities
Scientific paper
The reflection of Alfvén waves from conducting boundaries or boundary layers plays a crucial role in many laboratory and natural plasmas because the reflected wave can reduce or enhance the electric field pattern of the incident wave. In the Large Plasma Device at UCLA we are investigating the reflection of shear Alfvén waves from surfaces of various conductivities, from insulating to conducting. A single frequency wave is launched from an antenna and reflects from a large reflecting surface inserted into the plasma column. By using various materials, the axially integrated conductivity of the reflecting disk can be adjusted relative to the Alfvén conductivity, 1/(μ 0vA). The data are compared with the expected theoretical behavior of the reflected wave amplitude and phase as a function of the reflecting surface conductivity.
Gekelman Walter
Leneman David
Maggs James
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