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- W1635492406 abstract "The emission or absorption of soft x-ray light can be used as the basis for diagnostic techniques in the compression of material in microballoons which are irradiated by intense laser light. “Explosive-pusher” laser irradiation experiments at the University of Rochester USA and at the Rutherford Laboratory, UK, using ‘slot-hole’ crystal spectrometers, allow space-resolution of the XUV spectrum emitted from the compressed core, from the microballoon shell and from the ablation layer. Stark-broadened line emission from quantum states (n¯ ≥ 4) of Hydrogen-like Si13+ and O7+ from the glass microballoon wall, and from Ne9+ when neon is used as a fill gas, allow derivation of the compression (Å), while the ‘opacity broadening’ of lower Lyman series lines allow a derivation of the confinement factor <ρ R>. At the Rutherford Laboratory, backlighting the compressed core with XUV emission (λ ˜ 10 å) from a subsidiary, irradiated target is used to follow the time history of the compression and indicates substantially similar compression factors. The analysis of these results are critically reviewed and it is indicated in this lecture that considerable care has to be taken with the analysis of the Stark profiles especially, when at high densities, correlations, ion dynamics and Debye screening play important roles. Furthermore in the analysis of <ρ R> the equation of radiative transfer should be solved for an inhomogenous plasma with temperature gradients and differential plasma velocities. The general area of XUV diagnostic techniques remains, however, a powerful tool in material compression experiments. The scope for x-ray analysis would be enlarged very much further however if XUV lasers were to be developed. Then the probe light might be ‘frequency-tuned’ to the absorption spectrum of specific diagnostic test atoms included in the compression." @default.
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- W1635492406 date "1979-01-01" @default.
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- W1635492406 title "XUV EMISSION AS A DIAGNOSTIC OF LASER-HEATED PLASMAS" @default.
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- W1635492406 doi "https://doi.org/10.1016/b978-0-08-023429-8.50013-4" @default.
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