Abstract
Computed Tomography (CT) is a powerful method for non-destructive testing (NDT) and metrology awakes with expanding application fields. To improve the spatial resolution of high energy CT, a micro-spot gamma-ray source based on bremsstrahlung from a laser wakefield accelerator was developed. A high energy CT using the source was performed, which shows that the resolution of reconstruction can reach 100 μm at 10% contrast. Our proof-of-principle demonstration indicates that laser driven micro-spot gamma-ray sources provide a prospective way to increase the spatial resolution and toward to high energy micro CT. Due to the advantage in spatial resolution, laser based high energy CT represents a large potential for many NDT applications.
Highlights
X-ray computed tomography (CT) has progressed significantly since its introduction in 19721
Measurement precision is very important to those applications, high energy Computed Tomography (CT) is still limited to sub-millimeter spatial resolution
A 0.8 J, 28 fs laser pulse was focused on a gas jet with an outlet diameter of 0.7 mm to generate low emittance electron beams with energies of tens of MeV
Summary
X-ray computed tomography (CT) has progressed significantly since its introduction in 19721. Measurement precision is very important to those applications, high energy CT is still limited to sub-millimeter spatial resolution. The CT spatial resolution is mainly determined by the spot size of the radiation source[4]. Micro-computed tomography, defined as spatial resolution less than 100 μm, has been achieved for low energy CT by the development of micro-spot X-ray machine[5]. High energy CT needs a bremsstrahlung source which is produced by MeV or higher electron beams from an electron linear accelerator[6,7]. High-quality electron beams can be reproduced steadily with peak energies from several hundreds of MeV to several GeV12–16. Resolution object the transverse and longitudinal sizes of the electron bunch are extremely small (few μm), and comparable to the laser focal spot size (~10 μm) and pulse duration (~10 fs)
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