Pulsed Quasi-monochromatic x-ray source for radiography and x-ray absorption spectroscopy

Monochromatic and quasi-monochromatic x-ray backlighting is a proven diagnostic technique with many important applications in Inertial Confinement Fusion and related research work. The quasi-monochromatic x-ray source can also be used in the x-ray absorption spectroscopy. A quasi-monochromatic x-ray backlighting system in the spectral range of 7.9 – 9.4 Å (1.32 1.57 keV) range has been developed using Thallium Acid phthalate (TAP) crystal. This diagnostics is tunable in the wavelength range of 7 10 Å. In one setting it can cover a spectral range of 1.5 Å (∆E = 0.25 keV). The x-ray radiograph spectral parameters were optimized using copper plasma. The temporal pulse duration was measured as 1.0 ns using indigenously developed fast x-ray vacuum bi-planar photodiodes ( ̴ 150 ps). The spatial resolution calculated was 50 μm which depends on the plasma source size.