Mapping the X-Ray Emission Region in a Laser-Plasma Accelerator
S. Corde, C. Thaury, K. Ta Phuoc, A. Lifschitz, G. Lambert, J. Faure,, O. Lundh, E. Benveniste, A. Ben-Ismail, L. Arantchuk, A. Marciniak, A., Stordeur, P. Brijesh, A. Rousse, A. Specka, and V. Malka
TL;DR
This paper presents a method to map the x-ray emission region in laser-plasma accelerators using beam profile measurements with an aperture mask, revealing insights into plasma density effects and electron dynamics.
Contribution
It introduces a novel technique for mapping x-ray emission regions in laser-plasma accelerators through beam profile analysis with an aperture mask, advancing understanding of plasma physics.
Findings
X-ray emission position and length depend on plasma density
Mapping reveals electron self-injection and multiple injection regions
Insights into electron beam driven wakefield dynamics
Abstract
The x-ray emission in laser-plasma accelerators can be a powerful tool to understand the physics of relativistic laser-plasma interaction. It is shown here that the mapping of betatron x-ray radiation can be obtained from the x-ray beam profile when an aperture mask is positioned just beyond the end of the emission region. The influence of the plasma density on the position and the longitudinal profile of the x-ray emission is investigated and compared to particle-in-cell simulations. The measurement of the x-ray emission position and length provides insight on the dynamics of the interaction, including the electron self-injection region, possible multiple injection, and the role of the electron beam driven wakefield.
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