Betatron radiation polarization control by using an off-axis ionization injection in a laser wakefield acceleration

Zhang, Guobo and Chen, Min and Yang, Xiaohu and Liu, Feng and Weng, Suming and Ma, Yanyun and Zou, Debin and Yu, Tongpu and Shao, Fuqiu and Sheng, Zhengming (2020) Betatron radiation polarization control by using an off-axis ionization injection in a laser wakefield acceleration. Optics Express, 28 (20). pp. 29927-29936. ISSN 1094-4087

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    Abstract

    Tunable X-ray sources from a laser-driven wakefield have wide applications. However, due to the difficulty of electron dynamics control, currently the tunability of laser wakefield-based X-ray sources is still difficult. By using three-dimensional particle-in-cell simulations, we propose a scheme to realize controllable electron dynamics and X-ray radiation. In the scheme, a long wavelength drive pulse excites a plasma wake and an off-axis laser pulse with a short wavelength co-propagates with the drive pulse and ionizes the K-shell electrons of the background high-Z gas. The electrons can be injected in the wakefield with controllable transverse positions and residual momenta. These injected electrons experience controllable oscillations in the wake, leading to tunable radiations both in intensity and polarization.

    ORCID iDs

    Zhang, Guobo, Chen, Min, Yang, Xiaohu, Liu, Feng, Weng, Suming, Ma, Yanyun, Zou, Debin, Yu, Tongpu, Shao, Fuqiu and Sheng, Zhengming ORCID logoORCID: https://orcid.org/0000-0002-8823-9993;