title: Efficient multi-keV X-ray sources from Ti-doped aerogel targets.
abstract: We have measured the production of hnu approximately 4.7 keV x rays from low-density Ti-doped aerogel (rho approximately 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 microm) 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 (n(e)/n(crit)</=0.1), and a laser-bleaching wave excites, supersonically, the high-Z emitter ions in the sample. 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 and 260 J of output with 4.67</=hnu</=5.0 keV.
authors.affiliation: Lawrence Livermore National Laboratory, P.O. Box 808, L-41, Livermore, California 94550, USA.
authors.forename: K B
authors.initials: KB
authors.lastname: Fournier
authors.forename: C
authors.initials: C
authors.lastname: Constantin
authors.forename: J
authors.initials: J
authors.lastname: Poco
authors.forename: M C
authors.initials: MC
authors.lastname: Miller
authors.forename: C A
authors.initials: CA
authors.lastname: Back
authors.forename: L J
authors.initials: LJ
authors.lastname: Suter
authors.forename: J
authors.initials: J
authors.lastname: Satcher
authors.forename: J
authors.initials: J
authors.lastname: Davis
authors.forename: J
authors.initials: J
authors.lastname: Grun