J. Phys. IV France
Volume 133, June 2006
Page(s) 449 - 451
Publié en ligne 16 juin 2006
Inertial Fusion Sciences and Applications 2005
J.-C. Gauthier, et al.
J. Phys. IV France 133 (2006) 449-451

DOI: 10.1051/jp4:2006133092

Absolute X-ray yields from laser-irradiated, Ge-doped aerogel targets

K.B. Fournier1, M. Tobin1, J.F. Poco1, K. Bradley1, S.B. Hansen1, C.A. Coverdale2, D. Beutler2, M. Severson2, E.A. Smith3 and D.L. Reeder3

1  Lawrence Livermore National Laboratory, Livermore, CA, USA
2  Sandia National Laboratory, Albuquerque, NM, USA
3  Ktech Corporation, Sandia National Laboratory, Albuquerque, NM

We have measured the production of $h\nu$ $\geq$ 10 keV x rays from low-density, Ge-doped aerogel targets at the OMEGA laser (Laboratory for Laser Energetics, University of Rochester). The targets were 1.2mm long by 1.5mm diameter beryllium cylinders filled with Ge-doped (20 atomic percent) SiO2 aerogel. The doped-aerogel density was 4.8 or 6.5 mg/cm3. Forty beams of the OMEGA laser ($\lambda$ = 351 nm) illuminated the two cylindrical faces of the target with a total power of $\gtrsim$18 TW. Ge K-shell x-ray emission was spectrally resolved with a two-channel crystal spectrometer and recorded with temporal resolution with a set of calibrated photoconductive devices (PCDs).

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