Physics – Plasma Physics
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..dppwp1051m&link_type=abstract
American Physical Society, 42nd Annual Meeting of the APS Division of Plasma Physics combined with the 10th International Congre
Physics
Plasma Physics
Scientific paper
Production of high energy x-rays by bremsstrahlung interaction of electrons created from plasma waves as a result of stimulated Raman scattering (SRS) of 351 nm laser light has been previously demonstrated on the Nova laser[1]. The energy and total yield of these x-rays were observed to scale with electron density and laser intensity. With the shutdown of Nova in May 1999, continuation of this work has shifted to the OMEGA laser. Recent experiments on OMEGA have used 40 beams in the P5/P8 indirect drive configuration to illuminate gas- and foam-filled cylinders to study the effect of 1) Au versus CH jackets and their relation to conversion of electrons to x-rays, 2) small scale inhomogeneity, and 3) strong ion wave damping. Measurements were made of the total hard x-ray output as well as the SRS on two of the beams. Preliminary results of these experiments suggest that electron temperatures comparable to those observed on Nova ( 50 keV) can be achieved on OMEGA, that x-ray conversion occurs substantially in the gas or foam, and that a factor of two to three increase in the x-ray yield is possible with variations in laser intensity, electron density, and composition of the target. [1] R.K. Kirkwood et al., Bull. Am. Phys. Soc. 44, 27 (1999).
Back Christina A.
Glenzer Siegfried H.
Hsing Warren W.
Kirkwood R. K.
Kruer W.
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