An electron beam generated by a laser-plasma accelerator is converted into an X-ray source by means of bremsstrahlung radiation in a dense material. This radiation source can be used to perform non-destructive testing (NDT) of dense objects.
To perform this type of X-ray imaging, it is necessary to work with a point-like source of high energy X-rays. For this purpose, a numerical optimization of the whole experiment is essential, we have to deal with two main parts, the laser-matter interaction for which we use a Particle-In-Cell code, and the X-ray emission part for which we use a Monte Carlo code.
In this talk we will discuss our recent approaches for tackling the limitations of NDT for dense objects : increasing the energy of the source and reducing its size.
In this paper we describe the experimental validation of the technique of correction of wavefront aberration in the middle of the laser amplifying chain. This technique allows the correction of the aberrations from the first part of the laser system, and the pre-compensation of the aberrations built in the second part. This approach will allow an effective aberration management in the laser chain, to protect the optical surfaces and optimize performances, and is the only possible approach for multi-Petawatt laser system from the technical and economical point of view. This approach is now possible after the introduction of new deformable mirrors with lower static aberrations and higher dynamic than the standard devices.
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