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

Journal Article · Wed Oct 20 00:00:00 EDT 2004 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.1824873· OSTI ID:20630247

Fournier, K B; Constantin, C; Gregori, G; Back, C A; Suter, L J ^[1]; Miller, M C ^[1]; Davis, J ^[2]; Grun, J ^[3]

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1. Lawrence Livermore National Laboratory, P.O. Box 808, L-41, Livermore, CA 94550 (United States)
2. Alme and Associates, 6020 Richmond Highway, Alexandria, VA 22303 (United States)
3. Plasma Physics Division, Naval Research Laboratory, 4555 Overlook Ave., SW, Washington DC 20375 (United States)

We have measured the production of hv {approx_equal} 4.7 keV x-rays from low-density Ti-doped aerogel ({rho} {approx_equal} 3 mg/cc) targets at the OMEGA laser facility (University of Rochester), with the goal of maximizing x-ray output. Forty OMEGA beams ({lambda}L = 0.351 {mu}m) illuminated the two cylindrical faces of the target with a total power that ranged from 7 to 14 TW. The laser fully ionizes the target (ne/ncrit {<=} 0.1), and a laser-bleaching wave excites, supersonically, the high-Z emitter ions in the sample. Heating in the target was imaged with gated x-ray framing cameras and an x-ray streak camera. 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. We find between 40 - 260 J of output with 4.67 {<=} hv {<=} 5.0 keV. Radiation-hydrodynamic calculations predict late time enhancement of the x-ray power due first to axial stagnation of the heating waves, then, ablatively-driven radial compression from the target walls.

• OSTI ID: 20630247
• Journal Information: AIP Conference Proceedings, Vol. 730, Issue 1; Conference: 14. APS topical conference on atomic processes in plasmas, Santa Fe, NM (United States), 19-22 Apr 2004; Other Information: DOI: 10.1063/1.1824873; (c) 2004 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALUMINIUM
COMPRESSION
CRYSTALS
DOPED MATERIALS
HEATING
IONS
K SHELL
KEV RANGE
LASERS
PHOTON EMISSION
PLASMA PRODUCTION
STREAK CAMERAS
TITANIUM
X RADIATION
X-RAY SOURCES