M-L band x-rays (3-3.5 KeV) from palladium coated targets for isochoric radiative heating of thin foil samples

B. Kettle, T. Dzelzainis, S. White, L. Li, A. Rigby, C. Spindloe, M. Notley, R. Heathcote, C. L. S. Lewis, D. Riley

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Abstract

We describe experiments designed to produce a bright M-L band x-ray source in the 3-3.5 keV region. Palladium targets irradiated with a 10(15) W cm(-2) laser pulse have previously been shown to convert up to similar to 2% of the laser energy into M-L band x-rays with similar pulse duration to that of the incident laser. This x-ray emission is further characterized here, including pulse duration and source size measurements, and a higher conversion efficiency than previously achieved is demonstrated (similar to 4%) using more energetic and longer duration laser pulses (200 ps). The emission near the aluminium K-edge (1.465-1.550 keV) is also reported for similar conditions, along with the successful suppression of such lower band x-rays using a CH coating on the rear side of the target. The possibility of using the source to radiatively heat a thin aluminium foil sample to uniform warm dense matter conditions is discussed.
Original languageEnglish
Article number224002
Number of pages9
JournalJournal of Physics B: Atomic Molecular and Optical Physics
Volume48
Issue number22
DOIs
Publication statusPublished - 25 Sep 2015

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