Thermal transport studies of 351-nm laser-produced plasmas using extreme ultraviolet spectroscopy

Journal Article · Mon Feb 01 04:00:00 EST 1988 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.340056· OSTI ID:5704558

Moreno, J C; Griem, H R; Goldsmith, S; Krumbein, A; Epstein, R; Jaanimagi, P A; Richardson, M C; Yaakobi, B

Spectra from an extreme ultraviolet (XUV) grazing incidence spectrograph have been used in the study of thermal transport in laser plasmas. These measurements with XUV lines allowed a diagnosis of much lower temperatures in the heating front than had been previously measured. The OMEGA (24-beam, 351-nm) laser system at the University of Rochester was used to produce plasmas from glass microballoons coated with Al or Ti substrates and overcoated with a plastic ablator. Thermal transport was investigated by measuring the intensity of x-ray and XUV lines as a function of the thickness of the plastic overcoat. These measurements were then compared to the 1D hydrodynamic code l-smcapsIl-smcapsa-smcapsc-smcaps. Agreement between the hydrodynamic code and experiment could not be obtained with a reasonable value for the flux limiter ( fless than or equal to0.65). Consistent results were reached if nonuniform irradiation and flux inhibition is assumed. The measured burnthrough depths of around 9 ..mu..m are similar to previous measurements made with x-ray lines at fluxes below 10/sup 15/ W/cm/sup 2/. No evidence of preheat in the heat front was observed.

• Research Organization: Laboratory for Plasma and Fusion Energy Studies, University of Maryland, College Park, Maryland 20742
• OSTI ID: 5704558
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 63:3; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700208* -- Fusion Power Plant Technology-- Inertial Confinement Technology
ALUMINIUM
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY TRANSFER
EXTREME ULTRAVIOLET RADIATION
HEAT TRANSFER
IONIZING RADIATIONS
LASER-PRODUCED PLASMA
METALS
MICROSPHERES
PLASMA
PLASMA DIAGNOSTICS
RADIATIONS
SPECTRA
THERMAL CONDUCTION
TITANIUM
TRANSITION ELEMENTS
ULTRAVIOLET RADIATION
ULTRAVIOLET SPECTRA
X RADIATION