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

Guobo Zhang, Min Chen, Xiaohu Yang, Feng Liu, Suming Weng, Yanyun Ma, Debin Zou, Tongpu Yu, Fuqiu Shao, Zhengming Sheng

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
7 Downloads (Pure)


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.

Original languageEnglish
Pages (from-to)29927-29936
Number of pages10
JournalOptics Express
Issue number20
Publication statusPublished - 22 Sep 2020


  • laser-driven wakefield
  • x-ray
  • microtomography

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