Interaction of a density modulated electron beam with a magnetized plasma: Emission of whistler waves

Journal Article · Fri Jul 01 00:00:00 EDT 1994 · Physics of Plasmas; (United States)

DOI:https://doi.org/10.1063/1.870615· OSTI ID:6922386

Krafft, C; Matthieussent, G; Thevenet, P; Bresson, S ^[1]

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1. Laboratoire de Physique des Gaz et des Plasmas, Universite Paris-Sud, Centre National de la Recherche Scientifique, 91405 Orsay Cedex (France)

Whistler wave excitation in a magnetized laboratory plasma by a density modulated electron beam is studied for frequency modulation below, but in the range of, the electron gyrofrequency. When the beam velocity differs from the phase velocity of the whistler at the frequency modulation of the beam, a whistler wave, and, by [hacek C]erenkov emission, a beam wave at the same frequency are excited as single poles. When both velocities are equal, a resonance occurs leading to a maximum in the emission of whistler waves. The experiment performed in a magnetized plasma ([ital n][sub [ital p]][approx]10[sup 11] cm[sup [minus]3], [ital T][sub [ital e]][approx]0.2 eV, [ital B][approx]100 G) with a modulated electron beam ([ital n][sub [ital b]][approx]10[sup 9] cm[sup [minus]3], [ital E][sub [ital b]][approx]300 eV) is in agreement with a simple model which predicts the characteristics of the excited waves.

• OSTI ID: 6922386
• Journal Information: Physics of Plasmas; (United States), Vol. 1:7; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ELECTRON BEAMS
BEAM-PLASMA SYSTEMS
WHISTLERS
CHERENKOV RADIATION
EARTH MAGNETOSPHERE
FREQUENCY MODULATION
IONOSPHERE
MODULATION
RESONANCE
BEAMS
EARTH ATMOSPHERE
ELECTROMAGNETIC RADIATION
LEPTON BEAMS
NOISE
PARTICLE BEAMS
PLANETARY IONOSPHERES
RADIATIONS
RADIO NOISE
RADIOWAVE RADIATION
700350* - Plasma Production
Heating
Current Drive
& Interactions- (1992-)
700340 - Plasma Waves
Oscillations
& Instabilities- (1992-)