Observation of bifurcation phenomena in an electron beam plasma system
- Kyushu Univ., Fukuoka (Japan)
When an electron beam is injected into a plasma, unstable waves are excited spontaneously near the electron plasma frequency f{sub pe} by the electron beam plasma instability. The experiment on subharmonics in an electron beam plasma system was performed with a glow discharge tube. The bifurcation of unstable waves with the electron plasma frequency f{sub pe} and 1/2 f{sub pe} was observed using a double-plasma device. Furthermore, the period doubling route to chaos around the ion plasma frequency in an electron beam plasma system was reported. However, the physical mechanism of bifurcation phenomena in an electron beam plasma system has not been clarified so far. We have studied nonlinear behaviors of the electron beam plasma instability. It was found that there are some cases: the fundamental unstable waves and subharmonics of 2 period are excited by the electron beam plasma instability, the fundamental unstable waves and subharmonics of 3 period are excited. In this paper, we measured the energy distribution functions of electrons and the dispersion relation of test waves in order to examine the physical mechanism of bifurcation phenomena in an electron beam plasma system.
- OSTI ID:
- 232795
- Report Number(s):
- CONF-950749--
- Country of Publication:
- United States
- Language:
- English
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