Abstract
The effect of beam waist radius on the radiation properties of electrons in the presence or absence of an applied magnetic field is comparatively investigated when Gaussian circularly polarized laser pulse drives electrons for relativistic nonlinear Thomson forward scattering. This effect will be investigated in terms of the electrodynamic properties of high-energy electrons, the full-angular distribution of radiated power and the spectral properties. We study the coupling effect of the crossover parameter, the applied magnetic field and the beam waist radius. Based on theoretical analyses and numerical calculations, we find that the various radiation properties at different beam waist radii are consistent. And there always exists an optimal beam waist radius, which makes the stimulated radiation of high-energy electrons high-power, highly-collimated, well-directed, wide-frequency-domain, and super-continuous, when Gaussian laser drives the electron oscillating. Moreover, we found that the radiation properties are significantly improved in all directions when an applied magnetic field is introduced. Accordingly, we select the optimal beam radius on the basis of the applied magnetic field. After numerical simulations, we developed a modulation method for \(X\)-rays with optimal radiation properties. The above study is a pioneering guide for modulation of \(X\)-rays in optical laboratories.
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Acknowledgements
This work has been supported by the National Natural Sciences Foundation of China under Grant No. 10947170/A05 and No. 11104291, Natural science fund for colleges and universities in Jiangsu Province under Grant No. 10KJB140006, Natural Sciences Foundation of Shanghai under Grant No. 11ZR1441300 and Natural Science Foundation of Nanjing University of Posts and Telecommunications under Grant No. 202310293146Y and sponsored by Jiangsu Qing Lan Project.
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YZ Analyzed the result, wrote the main manuscript text and prepared figures 7-10 and 13-14. HW Ran program, analyzed the data and prepared figures 2-3 and 11-12. FG Derived the formula, wrote the manuscript and prepared figures 4-6 YW Wrote code, improved article visibility and technicality, and prepared figure 1. XL Verified the result, improved the programs, wrote and reviewed the manuscript. QY Investigated the relevant field, improved the method and reviewed the manuscript. YT Managed the project, provided funds and resources, supervised and reviewd the manuscript.
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Zhang, Y., Wang, H., Gu, F. et al. Optimum beam waist radius under applied magnetic field for optimal radiation properties of nonlinear Thomson scattering. Appl. Phys. B 130, 43 (2024). https://doi.org/10.1007/s00340-024-08178-0
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DOI: https://doi.org/10.1007/s00340-024-08178-0