Details

Autor(en) / Beteiligte

• Valdivia, M P
• Stutman, D
• Stoeckl, C
• Theobald, W
• Mileham, C
• Begishev, I A
• Bromage, J
• Regan, S P

Titel

An x-ray backlit Talbot-Lau deflectometer for high-energy-density electron density diagnostics

Ist Teil von

• Review of scientific instruments, 2016-02, Vol.87 (2), p.023505

Ort / Verlag

United States

Erscheinungsjahr

2016

Quelle

MEDLINE

Beschreibungen/Notizen

• X-ray phase-contrast techniques can measure electron density gradients in high-energy-density plasmas through refraction induced phase shifts. An 8 keV Talbot-Lau interferometer consisting of free standing ultrathin gratings was deployed at an ultra-short, high-intensity laser system using K-shell emission from a 1-30 J, 8 ps laser pulse focused on thin Cu foil targets. Grating survival was demonstrated for 30 J, 8 ps laser pulses. The first x-ray deflectometry images obtained under laser backlighting showed up to 25% image contrast and thus enabled detection of electron areal density gradients with a maximum value of 8.1 ± 0.5 × 10(23) cm(-3) in a low-Z millimeter sized sample. An electron density profile was obtained from refraction measurements with an error of <8%. The 50 ± 15 μm spatial resolution achieved across the full field of view was found to be limited by the x-ray source-size, similar to conventional radiography.