Share Email Print
cover

Proceedings Paper

Efficient multi-keV x-ray sources from Ti-doped aerogel targets
Author(s): Kevin B. Fournier; Camen G. Constantin; John Poco; Michael C. Miller; Christina A. Back; Larry J. Suter; Joe Satcher; John F. Davis; Jacob Grun
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

We have measured the production of equal to or greater than 4.5 keV x-rays from low-density Ti-doped aerogel targets at the OMEGA laser facility (University of Rochester). The targets were 2.2 mm long by 2 mm diameter beryllium cylinders filled with Ti-doped (3 atomic percent) SiO2 foam. The doped-foam density was ≈ 3 mg/cc. Forty beams of the OMEGA laser (λ = 351 nm) illuminated the two cylindrical faces of the target with a total power that ranged from 7 to 14 TW. The laser interaction fully ionizes the target (formula available in paper), and allows the laser-bleaching wave to excite, supersonically, the high-Z emitter ions in the sample. The heating of the target was imaged with a gated (200 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. An x-ray streak camera, also filtered to observe > 4 keV, was used to measure the rate of heat propagation in the target. Ti K-shell x-ray emission was spectrally resolved with a two-channel crystal spectrometer and also with a set of filtered aluminum x-ray diodes, both instruments provide absolute measurement of the multi-keV x-ray emission. Back-scattered laser energy is observed to be minimal. We find between 100 to 400 J of output with 4.67 equal to or less than hv equal to or less than 5.0 keV, predicted target performance is a factor of 2 - 3 too low in this range.

Paper Details

Date Published: 7 January 2004
PDF: 11 pages
Proc. SPIE 5196, Laser-Generated and Other Laboratory X-Ray and EUV Sources, Optics, and Applications, (7 January 2004); doi: 10.1117/12.505872
Show Author Affiliations
Kevin B. Fournier, Lawrence Livermore National Lab. (United States)
Camen G. Constantin, Lawrence Livermore National Lab. (United States)
John Poco, Lawrence Livermore National Lab. (United States)
Michael C. Miller, Lawrence Livermore National Lab. (United States)
Christina A. Back, Lawrence Livermore National Lab. (United States)
Larry J. Suter, Lawrence Livermore National Lab. (United States)
Joe Satcher, Lawrence Livermore National Lab. (United States)
John F. Davis, Alme & Associates (United States)
Jacob Grun, Naval Research Lab. (United States)


Published in SPIE Proceedings Vol. 5196:
Laser-Generated and Other Laboratory X-Ray and EUV Sources, Optics, and Applications
George A. Kyrala; Jean-Claude J. Gauthier; Carolyn A. MacDonald; Ali M. Khounsary, Editor(s)

© SPIE. Terms of Use
Back to Top