Source size analysis of x-rays driven by laser wakefield acceleration*

We developed an analytical tool based on the Fresnel Diffraction formalism, to determine the X-ray source size of Laser Wakefield (LWFA) generated X-rays, in several regimes (Self Modulated, Nano-particle enhanced, Blowout LWFA) and at multiple facilities (Berkeley Lab Laser Accelerator, Texas Petawatt, and Jupiter Laser Facility). This analysis will help us understand the properties of these X-ray sources for use in radiography in High Energy Density (HED) science applications. For our analysis, a razor blade was imaged using the respective X-ray sources, and from the diffraction pattern cast onto the detector, we can fit a model diffraction pattern to determine the x-ray source size. This work primarily focuses on Betatron X-rays, and Inverse Compton Scattering and Bremsstrahlung X-ray sources were also examined. Due to the different pulse durations and laser parameters available at different facilities, it is important to examine various regimes of LWFA when designing an X-ray diagnostic to be used for radiography of HED phenomena. We will show the distinction between X-ray source sizes generated by different LWFA regimes, and at different laser facilities.