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

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 1015 W cm−2 laser pulse have previously been shown to convert up to ∼2% of the laser energy into M-L band x-rays with similar pulse duration to that of the incident...

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Bibliographic Details
Published in:Journal of physics. B, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2015-11, Vol.48 (22), p.224002-224010
Main Authors: Kettle, B, Dzelzainis, T, White, S, Li, L, Rigby, A, Spindloe, C, Notley, M, Heathcote, R, Lewis, C L S, Riley, D
Format: Article
Language:English
Subjects:
Coating
Emission
Foils
heating
Lasers
M-L
Palladium
Pulse duration
radiative
warm dense matter
WDM
x-ray
X-ray sources
X-rays
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Summary: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 1015 W cm−2 laser pulse have previously been shown to convert up 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 (∼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.
ISSN:0953-4075
1361-6455
DOI:10.1088/0953-4075/48/22/224002