Time-Resolved X-Ray Radiography of Spark Ignition Plasma

Laser plasma x-ray source for ultrafast time-resolved x-ray absorption spectroscopy

We describe a laser-driven x-ray plasma source designed for ultrafast x-ray absorption spectroscopy. The source is comprised of a 1 kHz, 20 W, femtosecond pulsed infrared laser and a water target. We present the x-ray spectra as a function of laser energy and pulse duration. Additionally, we investigate the plasma temperature and photon flux as we vary the laser energy. We obtain a 75 μm FWHM x...

Use of Time Resolved X-Ray Radiography to Measure Interdiffusion in Liquid Metals

1. Introduction Chemical diffusion (also named interdiffusion), originating from the fluctuations among different elements, is a common phenomenon in multicomponent liquid metals. The interdiffusion coefficients in liquid alloys control the liquid-solid transformation and are thus basic parameters for materials design from the melt. In this work, a novel X-ray radiography (XRR) technique (Fig.1...

Development of high speed spectroscopic imaging techniques for the time resolved study of spark ignition phenomena

This paper reports on the development of novel time resolved spectroscopic imaging techniques for the study of spark ignition phenomena in combustion cells and an SIengine. The techniques are based on planar laser induced fluorescence imaging (PLIF) of OH radicals, on fuel tracer PLIF, and on chemiluminescence. The techniques could be achieved at repetition rates reaching several hundreds of ki...

Time-resolved Phase Contrast Radiography and DEI with Partial Coherent Hard X-ray at BSRF

Application of a picosecond soft x-ray source to time-resolved plasma dynamics

We demonstrate the application of an ultrashort x-ray source as an external probe to measure plasma dynamics. The plasma is generated by a 100-fs Ti:sapphire laser focused onto thin metallic films. Time-resolved spectroscopy of the gold x-ray probe transmission through a perturbed 1000 Å aluminum film reveals redshifts of the L-shell photoabsorption edge. We show that the dynamic behavior of th...