Bragg diffraction using a 100 ps 17.5 keV x-ray backlighter and the Bragg diffraction imager

Maddox, B. R.; Park, H.-S.; Hawreliak, J.; Elsholz, A.; Van Maren, R.; Remington, B. A.; Comley, A.; Wark, J. S.
October 2010
Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p10E522
Academic Journal
A new diagnostic for measuring Bragg diffraction of petawatt-generated high-energy x rays off a laser-compressed crystal was designed and tested successfully at the Omega EP laser facility on static Mo and Ta (111) oriented single crystal samples using a 17.5 keV Mo Kα backlighter. The Bragg diffraction imager consists of a heavily shielded enclosure and a precisely positioned beam block attached to the enclosure by an aluminum arm. Fuji image plates are used as the x-ray detectors. The diffraction from Mo and Ta (222) crystal planes was clearly detected with a high signal-to-noise. This technique will be applied to shock- and quasi-isentropically loaded single crystals on the Omega EP laser.


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