Characterization of heat transport and radiation hydrodynamics in collisional laser plasmas using collective Thomson scattering
Abstract
The author proposes using the collective Thomson scattering lineshape from ion acoustic waves to measure the spatial structure of local heat transport parameters and collisionality. Ion acoustic peak height asymmetry is used in conjunction with a recently developed model describing the effects of collisional and Landau damping contributions on the low-frequency electron density fluctuation spectrum to extract the relative electron drift. The local heat flux q(sub e) (proportional to drift) and the electron thermal conductivity (kappa)(sub e(approximately)) - q(sub e)/(gradient)T(sub e) would be inferred from experimentally determined temperature gradients (gradient)T(sub e). Damping of the entropy wave component at zero mode frequency is shown to be an estimate of the ion thermal conductivity (kappa)(sub i), and its visibility is a direct measure of the ion-ion mean free path (lambda)(sub ii).
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- 1993
- Bibcode:
- 1993STIN...9423209C
- Keywords:
-
- Collisional Plasmas;
- Electron Density (Concentration);
- Heat Transfer;
- Hydrodynamics;
- Ion Acoustic Waves;
- Landau Damping;
- Laser Plasmas;
- Plasma Diagnostics;
- Thomson Scattering;
- Damping;
- Entropy;
- Heat Flux;
- Mean Free Path;
- Temperature Gradients;
- Thermal Conductivity;
- Lasers and Masers