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Hard x-ray and hot electron environment in vacuum hohlraums at the National Ignition Facility

2006; American Institute of Physics; Volume: 13; Issue: 3 Linguagem: Inglês

10.1063/1.2186927

1527-2419

J. W. McDonald, L. J. Suter, O. L. Landen, J. M. Foster, J. Celeste, J. P. Holder, E. L. Dewald, M. B. Schneider, D. E. Hinkel, R. L. Kauffman, L. J. Atherton, R. E. Bonanno, S. N. Dixit, D. C. Eder, C. Haynam, D. Kalantar, Alice Koniges, F. D. Lee, B. J. MacGowan, K. R. Manes, D. H. Munro, J. R. Murray, Michael Shaw, R. M. Stevenson, T. Parham, B. M. Van Wonterghem, R. J. Wallace, Paul J. Wegner, P. K. Whitman, B. K. Young, B. A. Hammel, E. I. Moses,

Atomic and Molecular Physics

Time resolved hard x-ray images (hv>9keV) and time integrated hard x-ray spectra (hv=18–150keV) from vacuum hohlraums irradiated with four 351nm wavelength National Ignition Facility [J. A. Paisner, E. M. Campbell, and W. J. Hogan, Fusion Technol. 26, 755 (1994)] laser beams are presented as a function of hohlraum size, laser power, and duration. The hard x-ray images and spectra provide insight into the time evolution of the hohlraum plasma filling and the production of hot electrons. The fraction of laser energy detected as hot electrons (Fhot) shows a correlation with laser intensity and with an empirical hohlraum plasma filling model. In addition, the significance of Au K-alpha emission and Au K-shell reabsorption observed in some of the bremsstrahlung dominated spectra is discussed.