Role of Ion Motion and of Return Currents in Transverse Instability of Colliding Plasmas.
Topical research rept.,
CORNELL UNIV ITHACA N Y LAB OF PLASMA STUDIES
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Proper account of the ion dynamics is shown to lead to a significant change in the extent of the unstable range of transverse modes. However, no very high growth rates can be produced by the ions. For relativistic electron beams in a cold plasma, the role of return currents induced in the plasma and of plasma collisions are analyzed. The return currents do not influence the transverse instability except for the extreme relativistic region gammaN sub bN sub p 1, where the plasma electrons take over in maintaining the growth rate high. Collisions are unimportant unless their frequency nuoromega sub psquared plasmaomega sub p beam, where transverse oscillations cease to be electrically neutralized, so that pinching becomes impossible and the growth rate of the instability goes to zero like 1nu. Author
- Plasma Physics and Magnetohydrodynamics