Streaming instabilities of intense charged particle beams propagating along a solenoidal magnetic field in a background plasma
- Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543 (United States)
Streaming instabilities of intense charged particle beams propagating along a solenoidal magnetic field in a background plasma are studied analytically and numerically. It is shown that the growth rate of the electromagnetic Weibel instability is modified by a relatively weak solenoidal magnetic field such that {omega}{sub ce}>{beta}{sub b}{omega}{sub pe}, where {omega}{sub ce} is the electron gyrofrequency, {omega}{sub pe} is the electron plasma frequency, and {beta}{sub b} is the ion-beam velocity relative to the speed of light. Moreover, the Weibel instability is limited to very small propagation angles and long longitudinal wavelengths satisfying k{sub parallel}{sup 2}<<k{sub perpendicular}{sup 2} and c{sup 2}k{sub parallel}{sup 2}<<{omega}{sub pb}{sup 2}{omega}{sub pi}{sup 2}/({omega}{sub pb}{sup 2}+{omega}{sub pi}{sup =} 2), where {omega}{sub pb} and {omega}{sub pi} are the plasma frequencies of the beam ions and the background plasma ions, respectively. For shorter longitudinal wavelengths, the electrostatic lower-hybrid instability becomes dominant. In this paper, the growth rates of various electrostatic beam-plasma instabilities and the electromagnetic Weibel instability are compared, and the space-time development of the modified two-stream instability is studied in detail and compared with numerical simulations.
- OSTI ID:
- 21120420
- Journal Information:
- Physics of Plasmas, Vol. 15, Issue 6; Other Information: DOI: 10.1063/1.2918673; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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