Imaging experiments of Ne-like x-ray lasers

Details Imaging experiments of Ne-like x-ray lasers Imaging experiments of Ne-like x-ray lasers

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spie.3156...71m&link_type=abstract

Proc. SPIE Vol. 3156, p. 71-77, Soft X-Ray Lasers and Applications II, Jorge J. Rocca; Luiz B. Da Silva; Eds.

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We discuss high resolution two-dimensional near-field images of the neon-like nickel and germanium x-ray laser obtained using the Asterix laser at the Max-Planck-Institute and the Nova laser at Lawrence Livermore National Laboratory. Our imaging diagnostic consisted of a concave multilayer mirror that imaged the output end of the x-ray laser line onto a backside illuminated x-ray CCD detector. A 25 micrometer thick wire positioned at the end of the target provided a spatial fiducial. With the Asterix iodine laser, a prepulse 5.23 ns before the main pulse, was used to irradiate slab targets. A great deal of structure was observed in the near field images, particularly in the J equals 0 - 1 emission. We observed a large difference in the spatial dependence of the J equals 0 - 1 and J equals 2 - 1 lines of germanium, with the J equals 2 - 1 emission peaking farther away from the original target surface. A larger prepulse moved the peak emission farther away from the target surface. For the Nova experiments we used a series of 100 ps pulses spaced 400 ps apart to illuminate a germanium target. We obtained high resolution images of both the J equals 0 - 1 and J equals 2 - 1 lines of Ge. these measurements are compared to hydrodynamic simulations coupled with atomic kinetics and including refraction effects.

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