Detailed characterization of plasma wave behavior using collective Thomson scattering
- David S.
- John L.
- Thomas
Collective Thomson scattering is widely used to measure bulk plasma parameters in high density, laser-produced plasmas, and is used to detect plasma waves from instabilities. However, inhomogeneity in these small plasmas often leads to a spectrum with insufficient resolution to discern phenomena such as wave damping and nonlinear wave effects. Two techniques are discussed for laser-produced plasmas to overcome these limitations, and provide details of wave damping and nonlinear behavior. First, imaging Thomson scattering is used to obtain spatially-resolved plasma wave profiles in a 100-200 eV plasma, and allows us to infer ion-ion collisional damping rates. Second, a diffraction-limited laser beam is used to drive stimulated Raman scattering (SRS) in a hot plasma, generating large amplitude Langmuir waves. The comparatively small interaction volume permits sufficient spectral resolution to observe nonlinear wave behavior, previously unresolved in other experiments.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 977559
- Report Number(s):
- LA-UR-04-2599; TRN: US201009%%844
- Resource Relation:
- Journal Volume: 75; Journal Issue: 10; Conference: Submitted to: Proceedings for: High temperature plasma diagnostics conference, April 19-22, 2004, San Diego, CA to be published in Review of Scientific Instruments
- Country of Publication:
- United States
- Language:
- English
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