12 October 2007 21-nm x-ray laser Thomson scattering of laser-heated exploding foil plasmas
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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.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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