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The nonlinear stage of the evolution of unstable Langmuir waves excited by two oppositely-propagating beams is studied experimentally. When a pump at frequency omega p is applied, the two monochromatic Langmuir waves thus generated ( omega p , k) and ( omega p , -k) form a standing wave. The ponderomotive force and the generation of cavitons lead to the process of plasma wave collapse to a spatial width of 7 lambda D and an intensity E 2 /4 pi nT approximately=0.4. Experimental evidence showing that transit time damping is the limiting mechanism for the collapse process is also discussed.
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Leung et al. (1982) studied this question.
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