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Proceedings Paper

Absolute x-ray yields from laser-irradiated Ge-doped aerogel targets
Author(s): K. B. Fournier; M. Tobin; J. F. Poco; K. Bradley; C. A. Coverdale; D. E. Beutler; T. Vidnovic III; S. B Hansen; M. Severson; E. A Smith; D. L. Reeder
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Paper Abstract

We have measured the production of hν ⩾ 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/cc. These targets are a major advance over previous doped aerogels: instead of suspending the dopant in the SiO2 matrix, the Ge atoms, with chemistry similar to Si, are incorporated directly in the matrix. Forty beams of the OMEGA laser (λ = 351 nm) illuminated the two cylindrical faces of the target with a total power of approximately 18 TW. The laser interaction strongly ionizes the target (ne/ncr⩽ 0.1-0.2), and allows the laser-bleaching wave to ionize supersonically the high-Z emitter ions in the sample. 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). The heating of the target was imaged with a gated (60 ps time resolution) x-ray framing camera, filtered to observe > 4 keV. 2-D radiative-hydrodynamic calculations predict rapid and uniform heating over the whole target volume with minimal energy losses into hydrodynamic motion. The calculations predict 150-200 J of x-ray energy output with hν ⩾ 10 keV. Good agreement between measurements and the calculations is found.

Paper Details

Date Published: 10 September 2005
PDF: 10 pages
Proc. SPIE 5918, Laser-Generated, Synchrotron, and Other Laboratory X-Ray and EUV Sources, Optics, and Applications II, 59180N (10 September 2005); doi: 10.1117/12.615056
Show Author Affiliations
K. B. Fournier, Lawrence Livermore National Lab. (United States)
M. Tobin, Lawrence Livermore National Lab. (United States)
J. F. Poco, Lawrence Livermore National Lab. (United States)
K. Bradley, Lawrence Livermore National Lab. (United States)
C. A. Coverdale, Sandia National Lab. (United States)
D. E. Beutler, Sandia National Lab. (United States)
T. Vidnovic III, Lawrence Livermore National Lab. (United States)
S. B Hansen, Lawrence Livermore National Lab. (United States)
M. Severson, Sandia National Lab. (United States)
E. A Smith, KTech Corp. (United States)
D. L. Reeder, KTech Corp. (United States)


Published in SPIE Proceedings Vol. 5918:
Laser-Generated, Synchrotron, and Other Laboratory X-Ray and EUV Sources, Optics, and Applications II
George A. Kyrala; Jean-Claude J. Gauthier; Carolyn A. MacDonald; Ali M. Khounsary, Editor(s)

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