Efficient multi-keV x-ray sources from Ti-doped aerogel targets

Kevin B. Fournier; Camen G. Constantin; John Poco; Michael C. Miller; Christina A. Back; Larry J. Suter; Joe Satcher; John F. Davis; Jacob Grun

doi:10.1117/12.505872

7 January 2004 Efficient multi-keV x-ray sources from Ti-doped aerogel targets

Kevin B. Fournier, Camen G. Constantin, John Poco, Michael C. Miller, Christina A. Back, Larry J. Suter, Joe Satcher, John F. Davis, Jacob Grun

Author Affiliations +

Proceedings Volume 5196, Laser-Generated and Other Laboratory X-Ray and EUV Sources, Optics, and Applications; (2004) https://doi.org/10.1117/12.505872
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

We have measured the production of hν 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.

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Kevin B. Fournier, Camen G. Constantin, John Poco, Michael C. Miller, Christina A. Back, Larry J. Suter, Joe Satcher, John F. Davis, and Jacob Grun "Efficient multi-keV x-ray sources from Ti-doped aerogel targets", Proc. SPIE 5196, Laser-Generated and Other Laboratory X-Ray and EUV Sources, Optics, and Applications, (7 January 2004); https://doi.org/10.1117/12.505872

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