Observation of a Transition from Fluid to Kinetic Nonlinearities for Langmuir Waves Driven by Stimulated Raman Backscatter
Journal Article
·
· Physical Review Letters
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
- University of California, San Diego, California 92093 (United States)
Thomson scattering is used to measure Langmuir waves (LW) driven by stimulated Raman scattering (SRS) in a diffraction limited laser focal spot. For SRS at wave numbers k{lambda}{sub D} < or approx. 0.29, where k is the LW number and {lambda}{sub D} is the Debye length, multiple waves are detected and are attributed to the Langmuir decay instability (LDI) driven by the primary LW. At k{lambda}{sub D} > or approx. 0.29, a single wave, frequency-broadened spectrum is observed. The transition from the fluid to the kinetic regime is qualitatively consistent with particle-in-cell simulations and crossing of the LDI amplitude threshold above that for LW self-focusing.
- OSTI ID:
- 20696241
- Journal Information:
- Physical Review Letters, Vol. 94, Issue 17; Other Information: DOI: 10.1103/PhysRevLett.94.175003; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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