title: K(alpha) fluorescence measurement of relativistic electron transport in the context of fast ignition.
abstract: Electron transport within solid targets, irradiated by a high-intensity short-pulse laser, has been measured by imaging K(alpha) radiation from high- Z layers (Cu, Ti) buried in low- Z (CH, Al) foils. Although the laser spot is approximately 10 microm [full width at half maximum (FWHM)], the electron beam spreads to > or =70 microm FWHM within <20 microm of penetration into an Al target then, at depths >100 microm, diverges with a 40 degree spreading angle. Monte Carlo and analytic models are compared to our data. We find that a Monte Carlo model with a heuristic model for the electron injection gives a reasonable fit with our data.
authors.affiliation: General Atomics, San Diego, California 92186, USA.
authors.forename: R B
authors.initials: RB
authors.lastname: Stephens
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authors.initials: RA
authors.lastname: Snavely
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authors.lastname: Aglitskiy
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authors.lastname: Scianitti