Spectroscopic investigations of hard x-ray emission from 120-ps laser-produced plasmas at intensities near 10(17) W cm(-2)

James Dunn; Bruce KF Young; Albert L. Osterheld; Mark E. Foord; Rosemary S. Walling; Richard E. Stewart; Anatoly Ya. Faenov

doi:10.1117/12.220986

18 September 1995 Spectroscopic investigations of hard x-ray emission from 120-ps laser-produced plasmas at intensities near 10¹⁷ W cm^-2

James Dunn, Bruce KF Young, Albert L. Osterheld, Mark E. Foord, Rosemary S. Walling, Richard E. Stewart, Anatoly Ya. Faenov

Author Affiliations +

Proceedings Volume 2523, Applications of Laser Plasma Radiation II; (1995) https://doi.org/10.1117/12.220986
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

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.

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James Dunn, Bruce KF Young, Albert L. Osterheld, Mark E. Foord, Rosemary S. Walling, Richard E. Stewart, and Anatoly Ya. Faenov "Spectroscopic investigations of hard x-ray emission from 120-ps laser-produced plasmas at intensities near 10¹⁷ W cm^-2", Proc. SPIE 2523, Applications of Laser Plasma Radiation II, (18 September 1995); https://doi.org/10.1117/12.220986

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