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
ISSN1520-8850
AutoresD. Juraszek, C. Bayer, M. Bernard, J. L. Bocher, F. Garaude, G. Thiell,
Tópico(s)Atomic and Molecular Physics
ResumoThe 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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