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

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