C VI Lyman line profiles from 10-ps KrF-laser-produced plasmas

Journal Article · Sun Oct 01 04:00:00 EDT 1995 · Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics

DOI:https://doi.org/10.1103/PhysRevE.52.4328· OSTI ID:239410

Leng, Y; Goldhar, J; Griem, H R ^[1]; Lee, R W ^[2]

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1. Institute for Plasma Research, University of Maryland, College Park, MD 20742 (United States)
2. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)

Plasmas with densities {approx_lt}10{sup 22} cm{sup {minus}3} and electron temperatures {ital T}{sub {ital e}}{approx_lt}200 eV were produced near solid graphite targets that were laser irradiated at {similar_to}10{sup 15} W/cm{sup 2}, with a {similar_to}10{sup 11} W/cm{sup 2} prepulse from amplified spontaneous emission. Photographic spectra taken nearly side-on within {approx_lt}0.1 mm from the target surface show strong H-like lines corresponding to {ital n}=2,3, and 4 to {ital n}=1 transitions and weaker He-like lines, with full width at half maximum widths {approx_lt}4 eV. The Lyman-{alpha} line is optically thick. A five-layer model with high-electron-density and electron-temperature core layers and less dense and cooler outer layers was used for simulation. Central layers with high {ital T}{sub {ital e}} contribute most of the emission while outside cooler layers cause an absorption dip in the central part of the Lyman-{alpha} line. Asymmetrical self-reversal is interpreted by radial expansion. A plasma-induced line shift was evident in some of the experimental line profiles, especially for the asymmetrical and strongly shifted Lyman-{gamma} line of C VI ions. Time-dependent rate equations were solved for checking the assumed local-thermodynamic-equilibrium condition for plasmas with adiabatic expansion cooling.

• OSTI ID: 239410
• Journal Information: Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, Journal Name: Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics Journal Issue: 4 Vol. 52; ISSN PLEEE8; ISSN 1063-651X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ASYMMETRY
EV RANGE 100-1000
GRAPHITE
ISOELECTRONIC ATOMS
KRYPTON FLUORIDE LASERS
LASER-PRODUCED PLASMA
LINE WIDTHS
LYMAN LINES
PLASMA CONFINEMENT
PLASMA EXPANSION
PULSES