X-ray source development for EXAFS measurements on the National Ignition Facility

Extended X-ray absorption Fine Structure (EXAFS) measurements require a bright, spectrally smooth, and broad-band x-ray source. In a laser facility, such an x-ray source can be generated by a laser-driven capsule implosion. In order to optimize the x-ray emission, different capsule types and laser i...

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Veröffentlicht in:Review of scientific instruments 2017-08, Vol.88 (8), p.083907-083907
Hauptverfasser: Coppari, F., Thorn, D. B., Kemp, G. E., Craxton, R. S., Garcia, E. M., Ping, Y., Eggert, J. H., Schneider, M. B.
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Sprache:eng
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Zusammenfassung:Extended X-ray absorption Fine Structure (EXAFS) measurements require a bright, spectrally smooth, and broad-band x-ray source. In a laser facility, such an x-ray source can be generated by a laser-driven capsule implosion. In order to optimize the x-ray emission, different capsule types and laser irradiations have been tested at the National Ignition Facility (NIF). A crystal spectrometer is used to disperse the x-rays and high efficiency image plate detectors are used to measure the absorption spectra in transmission geometry. EXAFS measurements at the K-edge of iron at ambient conditions have been obtained for the first time on the NIF laser, and the requirements for optimization have been established.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4999649