12 October 2007 21-nm x-ray laser Thomson scattering of laser-heated exploding foil plasmas
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Abstract
Recent experiments were carried out on the Prague Asterix Laser System (PALS) towards the demonstration of a soft x-ray laser Thomson scattering diagnostic for a laser-produced exploding foil. The Thomson probe utilized the Ne-like zinc x-ray laser which was double-passed to deliver ~1 mJ of focused energy at 21.2 nm wavelength and lasting ~100 ps. The plasma under study was heated single-sided using a Gaussian 300-ps pulse of 438-nm light (3ω of the PALS iodine laser) at laser irradiances of 1013-1014 W cm-2. Electron densities of 1020-1022 cm-3 and electron temperatures from 200 to 500 eV were probed at 0.5 or 1 ns after the peak of the heating pulse during the foil plasma expansion. A flat-field 1200 line mm-1 variable-spaced grating spectrometer with a cooled charge-coupled device readout viewed the plasma in the forward direction at 30° with respect to the x-ray laser probe. We show results from plasmas generated from ~1 μm thick targets of Al and polypropylene (C3H6). Numerical simulations of the Thomson scattering cross-sections will be presented. These simulations show electron peaks in addition to a narrow ion feature due to collective (incoherent) Thomson scattering. The electron features are shifted from the frequency of the scattered radiation approximately by the electron plasma frequency ±ωpe and scale as ne1/2.
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J. Dunn, J. Dunn, B. Rus, B. Rus, T. Mocek, T. Mocek, A. J. Nelson, A. J. Nelson, M. E. Foord, M. E. Foord, W. Rozmus, W. Rozmus, H. A. Baldis, H. A. Baldis, R. L. Shepherd, R. L. Shepherd, M. Kozlová, M. Kozlová, J. Polan, J. Polan, P. Homer, P. Homer, M. Stupka, M. Stupka, } "21-nm x-ray laser Thomson scattering of laser-heated exploding foil plasmas", Proc. SPIE 6702, Soft X-Ray Lasers and Applications VII, 67020O (12 October 2007); doi: 10.1117/12.734718; https://doi.org/10.1117/12.734718
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