Measurements of Laser Coupling and Plasma Profiles in Longer-Scalelength Plasmas.
Abstract
Novel configuration of our two-beam laser allows laser-coupling experiments to be performed in longer-scalelength plasmas (Ln approximately 250-600 micrometer at nc/10), which better simulate reactor-sized pellet plasmas. Preliminary observations show increased backscatter, as expected, but also reveal large reductions in 2 omega 0 and high-energy x-ray emissions. The latter may indicate lessened importance of resonance absorption in longer-scalelength plasmas. Measurements of plasma profiles are at least as important as coupling measurements in these experiments and we show new diagnostic techniques based upon tracer-dot methods. These include the first techniques available for velocity profile measurement, as well as an improved x-ray spectroscopic method for density and temperature profile measurement. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 1982
- Accession Number
- ADA121043
Entities
People
- Jacob Grün
- John A. Stamper
- M. J. Herbst
- P. G. Burkhalter
- Stephen P.P. Obenschain
Organizations
- United States Naval Research Laboratory