Beat wave excitation of electron plasma waves in a toroidal magnetized plasma
| Autor: | G. Dimonte, J. Killeen, D.Q. Hwang, R. L. Horton, J. H. Rogers, J. C. Thomas |
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| Rok vydání: | 1992 |
| Předmět: |
Fluid Flow and Transfer Processes
Physics Cyclotron Computational Mechanics General Physics and Astronomy Plasma Electron Condensed Matter Physics Plasma oscillation Electromagnetic radiation law.invention Thermal velocity Physics::Plasma Physics Mechanics of Materials law Dispersion relation Atomic physics Phase velocity |
| Zdroj: | Physics of Fluids B: Plasma Physics. 4:1920-1926 |
| ISSN: | 0899-8221 |
| DOI: | 10.1063/1.860044 |
| Popis: | Electrostatic waves are driven in a toroidal plasma by counterpropagating microwave beams with a difference in frequency approximately equal to the electron plasma frequency. Energetic electrons are detected when the phase velocity of the electrostatic waves are 3ve< vph < 7ve, where ve is the electron thermal velocity. Experiments are performed in the Davis Diverted Torus (DDT) [Bull. Am. Phys. Soc. 33, 2049 (1988)] operating in a high repetition rate (15 Hz), low‐density (7×107–2×109 cm−3) mode with only a toroidal magnetic field (∼110 G). The microwaves are triggered 30 μsec after the pulsed discharge ends. At this time the energetic electrons have left the system and the velocity distribution is Maxwellian (Te ∼ 1 eV). The microwaves have tunable frequencies over the range 8.5–9.5 GHz, and peak powers ∼180 kW (400 nsec). Bounded plasma modes are excited when the electron cyclotron frequency is larger than the electron plasma frequency. Direct measurements of the wave vector have been made with a doubl... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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