Hard X-Ray Emission From Laser-Produced Plasmas of U and Pb Recorded by a Transmission Crystal Spectrometer

Published

September 1, 2003

Author(s)

J Seely, R Doron, A Bar-Shalom, Lawrence T. Hudson, C Stoeckl

Abstract

Hard X-ray spectra from laser-produced plasmas were recorded by a transmission crystal survey spectrometer covering the 12 keV to 60 keV energy range with a resolving power of F/δEnearly equal to}100. This emission is of interest for the development of hard X-ray backlighters and hot electron diagnostics. Foils of U and Pb were irradiated at the OMEGA laser facility by 24 beams (12 on each side), each with an energy of nearly equal to} 500 J, a pulse duration of 1 ns, and no beam smoothing. The beams were focused to a 50 m diameter spot on the target plane. The spectra typically exhibit a few intense and relatively narrow features in the 12 keV to 22keV energy range. Initial analysis suggests that these hard X-ray features are inner-shell transitions resulting from L-shell vacancies created by energetic electrons. The observed transition energies are slightly higher than the neutral-atom characteristic X-ray energies. Calculations suggest that the transitions are in the Ni-like or lower ionization stages. The analysis further indicates that opacity effects play an important role in producing the spectra.

Citation

International Workshop on Radiative Properties of Hot Dense Matter

Volume

81

Issue

No. 1-4

Pub Type

Journals

Keywords

highly-charged ions, plasma spectroscopy, x-ray spectroscopy

Citation

Seely, J. , Doron, R. , Bar-Shalom, A. , Hudson, L. and Stoeckl, C. (2003), Hard X-Ray Emission From Laser-Produced Plasmas of U and Pb Recorded by a Transmission Crystal Spectrometer, International Workshop on Radiative Properties of Hot Dense Matter (Accessed October 12, 2025)