Using power-law least-squares fits to thick-target measurements of X-ray bremsstrahlung and characteristic line emission, analytic expressions for spectra and emission efficiencies of X-rays produced by a Maxwellian electron distribution were calculated. These expressions are particularly useful for the analysis of X-ray spectra produced by hot electrons in laser-produced plasma. The effect of self-absorption on the analysis of these spectra is estimated. It is shown that both the spectral shape and the adsorption effects dictate that bremsstrahlung measurements of plasma temperature should be made at photon energies greater than kT.
Saturation gain-length product during short-wavelength plasma lasing Appl. Phys. Lett. 101, 081105 (2012) Laser induced avalanche ionization in gases or gas mixtures with resonantly enhanced multiphoton ionization or femtosecond laser pulse pre-ionization Phys. Plasmas 19, 083508 (2012) A new scheme for stigmatic x-ray imaging with large magnification Rev. Sci. Instrum. 83, 10E527 (2012) Additional information on Phys. Fluids
The x-ray bremsstrahlung from 4 to 50 keV emitted by laser-produced plasmas has been measured using a Bragg crystal spectrometer. Direct spectral information was obtained in contrast to earlier filter spectroscopy. Measurements were made with focal spot powers of 1016 W/cm2 of 1.06-μm radiation and 1014 W/cm2 of 10.6-μm radiation. A definite suprathermal electron component was observed.
We have performed one-dimensional magnetohydrodynamic computer calculations of the formation and evolution of the solid-deuterium-fiber Z pinch. With use of a tabulated atomic data base and "cold-start" initial conditions, our computations show that current is carried by hot plasma which has been ablated from the solid fiber. The computations suggest that the experimentally observed instability growth may coincide with the complete ablation of the central fiber.
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