Spot spectroscopy: Local spectroscopic measurements within laser-produced plasmas

Abstract

Use of a locally embedded tracer in laser-irradiated solid targets yields a localized source of diagnostic x-ray line radiation in the blow off plasma. This technique potentially eliminates problems of chord integration over regions of varying density and temperature in an inhomogeneous plasma, and reduces complications due to plasma opacity effects in the interpretation of spectra. Spectra obtained in an experimental test of this new technique are of a quality superior to those obtained from standard laser-produced plasmas, and should provide the best tests to date of spectroscopic models for these plasma conditions.

Time-resolved spectroscopy and energy-resolved imaging of coated wire arrays as the interwire spacing is decreased

“…Moreover, the lines are sufficiently close, that they are easy to record on the same crystal spectrometer. Using tracer layers-dot spectroscopy-is well known in the laser plasma field [17], [20].…”

Spectroscopie X de couches L et M de plasmas hors équilibre thermodynamique local de niobium, tantale et tungstène

“…Cela nécessite de réaliser des expériences mesurant de manière simultanée et indépendante l'évolution hydrodynamique du plasma et son émission. [6,7] ce qui améliore les chances de bien décrire l'évolution hydrodynamique du plasma à l'aide d'un code 1D.…”

X-Ray Line Transfer in Plasmas with Large Velocity Gradients

“…Over the past 20 years dot target experiments have been used extensively as a tool to investigate laser-produced plasmas, and many examples may be found in the literature (Chambers et al, 2001;Herbst and Grun, 1981;Herbst et al, 1982;Gauthier et al, 1983;Burkhalter et al, 1983). In these experiments, small, thin dots are embedded into, or placed on top of, a lower Z material.…”

“…A powerful laser is then co-axially focused with the dot centre, with the laser spot diameter being much larger than the dot size. Use of a dot target has the advantages that (Herbst et al, 1982): the effects of source broadening are minimised allowing for better spectral resolution; and, through the combination of a relatively large laser spot size, small target, and a confining boundary plasma, the expansion of the dot can be taken to a first approximation as slab one-dimensional (1-D).…”