Abstract
We investigate the use of energetic electron beams for high-resolution radiography of flaws embedded in thick solid objects. A bright, monoenergetic electron beam (with energy >100 MeV) was generated by the process of laser-wakefield acceleration through the interaction of 50-TW, 30-fs laser pulses with a supersonic helium jet. The high energy, low divergence, and small source size of these beams make them ideal for high-resolution radiographic studies of cracks or voids embedded in dense materials that are placed at a large distance from the source. We report radiographic imaging of steel with submillimeter resolution.
Highlights
Laser-plasma based electron accelerator technology has advanced considerably since it was first proposed by Tajima and Dawson [1]
In order to predict the performance of the electron beam radiography device and compare this with measurements, the different experimental scenarios were modeled by means of Monte Carlo simulation code MCNPX v.2.5.0
We have demonstrated radiography of complex structures embedded in dense material using highenergy laser-accelerated electron beams
Summary
Laser-plasma based electron accelerator technology has advanced considerably since it was first proposed by Tajima and Dawson [1] The motivation behind this rapidly growing technology is the need for high quality particle beams that possess high spatial finesse along with monochromatic energy distribution, which is a requirement for most practical applications [2]. The small foot-print ($ 100 ft2) of such lasers makes them potentially portable These attributes make it worthwhile to consider the application of these energetic electron beams to nondestructive evaluation of defects in large structures, e.g., turbine blades and nuclear reactor vessels. These defects may range from a few microns to larger embedded cracks. Laserdriven electron beams possess all of these characteristics required for this unique and challenging interrogation modality
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