Absolute x-ray yields from laser-irradiated Ge-doped aerogel targets

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

doi:10.1117/12.615056

10 September 2005 Absolute x-ray yields from laser-irradiated Ge-doped aerogel targets

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

Author Affiliations +

Proceedings Volume 5918, Laser-Generated, Synchrotron, and Other Laboratory X-Ray and EUV Sources, Optics, and Applications II; 59180N (2005) https://doi.org/10.1117/12.615056
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

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 (n_e/n_cr⩽ 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.

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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, and D. L. Reeder "Absolute x-ray yields from laser-irradiated Ge-doped aerogel targets", Proc. SPIE 5918, Laser-Generated, Synchrotron, and Other Laboratory X-Ray and EUV Sources, Optics, and Applications II, 59180N (10 September 2005); https://doi.org/10.1117/12.615056

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