Measurements of laser coupling and plasma profiles in longer-scalelength plasmas

Conference · Thu Sep 30 04:00:00 EDT 1982

OSTI ID:6692498

Herbst, M J; Burkhalter, P G; Grun, J; Obenschain, S P; Stamper, J A; Young, F C; McLean, E A; Ripin, B H; Whitlock, R R

Novel configuration of our two-beam laser allows laser-coupling experiments to be performed in longer-scalelength plasmas (L/sub n/ approx. = 250 to 600 ..mu..m at n/sub c/10), which better simulate reactor-sized pellet plasmas. Preliminary observations show increased backscatter, as expected, but also reveal large reductions in 2..omega../sub 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.

• Research Organization: Naval Research Lab., Washington, DC (USA)
• DOE Contract Number: AI08-79DP40092
• OSTI ID: 6692498
• Report Number(s): NRL-MR-4893; CONF-820553-3; ON: DE83002294
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
700208 -- Fusion Power Plant Technology-- Inertial Confinement Technology
ABSORPTION
BACKSCATTERING
COUPLING
ELECTROMAGNETIC RADIATION
ENERGY TRANSFER
LASER RADIATION
LASER TARGETS
LASER-PRODUCED PLASMA
PLASMA
RADIATIONS
RESONANCE ABSORPTION
SCATTERING
SPECTRA
TARGETS
X-RAY SPECTRA