21-nm x-ray laser Thomson scattering of laser-heated exploding foil plasmas

J. Dunn; B. Rus; T. Mocek; A. J. Nelson; M. E. Foord; W. Rozmus; H. A. Baldis; R. L. Shepherd; M. Kozlová; J. Polan; P. Homer; M. Stupka

doi:10.1117/12.734718

12 October 2007 21-nm x-ray laser Thomson scattering of laser-heated exploding foil plasmas

J. Dunn, B. Rus, T. Mocek, A. J. Nelson, M. E. Foord, W. Rozmus, H. A. Baldis, R. L. Shepherd, M. Kozlová, J. Polan, P. Homer, M. Stupka

Author Affiliations +

Proceedings Volume 6702, Soft X-Ray Lasers and Applications VII; 67020O (2007) https://doi.org/10.1117/12.734718
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

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 ±ω_pe and scale as n_e^1/2.

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J. Dunn, B. Rus, T. Mocek, A. J. Nelson, M. E. Foord, W. Rozmus, H. A. Baldis, R. L. Shepherd, M. Kozlová, J. Polan, P. Homer, and 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); https://doi.org/10.1117/12.734718

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KEYWORDS

Plasmas

Thomson scattering

X-ray lasers

Laser scattering

Scattering

Spectroscopy

Aluminum

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