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Proceedings Paper

Spectroscopic investigations of hard x-ray emission from 120-ps laser-produced plasmas at intensities near 10(17) W cm(-2)
Author(s): James Dunn; Bruce KF Young; Albert L. Osterheld; Mark E. Foord; Rosemary S. Walling; Richard E. Stewart; Anatoly Ya. Faenov
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Paper Abstract

Spectroscopic investigations of the x-ray emission of plasmas heated by 120 ps, frequency doubled pulses from the JANUS Nd:glass laser are presented. High Z K-shell spectra emitted from slab targets heated to near 1017 W cm-2 intensity are investigated. High resolution ((lambda) /$DELTA(lambda) > 5000) x-ray spectra of multicharged ions of He-like Ti, Co, Ni, Cu, and also H-like Sc in the spectral range 1.5-3.0 angstrom are obtained in single laser shots using a spherically bent Mica crystal spectrograph with a 186 mm radius of curvature. The spectra have 1D spatial resolution of about 25 micrometers and indicate that the size of the emission zone of the resonance transitions is < 25 micrometers . Simultaneous x-ray images of the plasma from a charge-coupled device pinhole camera confirmed that the plasma x-ray emission is from a similar sized source. Survey spectra ((lambda) /(Delta) (lambda) equals 500 - 1000) taken with a flat LiF (200) crystal spectrometer with a charge-coupled device detector complement the high resolution data. 2D LASNEX modeling of the laser target conditions indicate that the high K-shell charge states are produced in the hot dense region of the plasma with electron temperature > keV and density approximately 1022 cm-3. These experiments demonstrate that with modest laser energy, plasmas heated by high-intensity 120 ps lasers provide a very bright source of hard approximately 8 keV x-ray emission.

Paper Details

Date Published: 18 September 1995
PDF: 10 pages
Proc. SPIE 2523, Applications of Laser Plasma Radiation II, (18 September 1995); doi: 10.1117/12.220986
Show Author Affiliations
James Dunn, Lawrence Livermore National Lab. (United States)
Bruce KF Young, Lawrence Livermore National Lab. (United States)
Albert L. Osterheld, Lawrence Livermore National Lab. (United States)
Mark E. Foord, Lawrence Livermore National Lab. (United States)
Rosemary S. Walling, Lawrence Livermore National Lab. (United States)
Richard E. Stewart, Lawrence Livermore National Lab. (United States)
Anatoly Ya. Faenov, VINIIFTRI (Russia)

Published in SPIE Proceedings Vol. 2523:
Applications of Laser Plasma Radiation II
Martin C. Richardson; George A. Kyrala, Editor(s)

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