Artigo Revisado por pares

Observation of soft x-ray emission in the corona of 0.35-μm laser-irradiated gold disks

1991; American Institute of Physics; Volume: 70; Issue: 4 Linguagem: Inglês

10.1063/1.349483

ISSN

1520-8850

Autores

D. Juraszek, C. Bayer, M. Bernard, J. L. Bocher, F. Garaude, G. Thiell,

Tópico(s)

Atomic and Molecular Physics

Resumo

The Phebus laser was used to irradiate gold targets at λ=0.35 μm; the laser pulse was 0.7 or 1.3 ns and the energy on target 1 to 1.8 kJ. The incident intensity was varied from 3×1013 to 3×1015 W/cm2. The time history of x-ray emission was monitored in the range 0.2–2.5 keV with a streak camera coupled with a transmission grating. Numerical simulations cannot replicate the temporal evolution of soft x-ray emission (hν<800 eV), although the total conversion efficiency is correctly reproduced. Some observations, including time and space-resolved images, show that unexpected soft x-ray emission is produced in the corona at large distances from the target surface. A possible explanation is that cold and dense jets are generated towards the underdense plasma by an instability.

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