Self-absorption of heliumlike satellite lines in high-density fusion plasmas

Journal Article · Sat Mar 01 04:00:00 EST 1980 · Phys. Rev., A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.21.932· OSTI ID:5456548

Duston, D; Davis, J

The high densities obtained in recent laser fusion experiments have created a need for additional plasma density diagnostics. The ratio of two heliumlike satellite lines, the 1s2p /sup 3/P..-->..2p/sup 2/ /sup 3/P and 1s2s /sup 3/S..-->..2s2p /sup 3/P transitions, has shown promise as a spectral diagnostic when laser-imploded microballoons are seeded with medium-atomic-weight gases. In this study results are presented from a collisional-radiative ionization-dynamics model with photoexcitation processes included that indicate that the emission from these satellite lines is strongly affected by opacity in density and temperature regimes common to plasmas to which this diagnostic could be applied effectively. The radiation emission attenuated by photon reabsorption is presented for neon, aluminum, and argon plasmas and compared with results predicted when the calculation is undertaken in an optically-thin-plasma approximation. The opacity effects are seen to cause multivaluedness in the line ratio at several temperatures, and an overall loss of sensitivity of the ratio with density is predicted.

• Research Organization: Plasma Radiation Group, Plasma Physics Division, Naval Research Laboratory, Washington, D. C. 20375
• OSTI ID: 5456548
• Journal Information: Phys. Rev., A; (United States), Journal Name: Phys. Rev., A; (United States) Vol. 21:3; ISSN PLRAA
• 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
IMPLOSIONS
LASER IMPLOSIONS
OPACITY
OPTICAL PROPERTIES
OPTICALLY THICK PLASMA
PHYSICAL PROPERTIES
PLASMA
PLASMA DENSITY
PLASMA DIAGNOSTICS
SPECTRA
X-RAY SPECTRA