Optimize laser wakefield accelerator asymmetric injection for coherent hard X-ray generation

Sung-Wei Huang^1,2*, Wei-Cheng Liu^1,2, Ming-Wei Lin³, Shih-Hung Chen¹, Shao-Wei Chou^1,2

¹Department of physics, National central university, Taoyuan City, Taiwan
²Center for high-energy and high-field physics, National central university, Taoyuan City, Taiwan
³Institute of Nuclear Engineering and Science, National Tsing Hua University, Hsinchu, Taiwan

* Presenter:Sung-Wei Huang, email:110222031@cc.ncu.edu.tw

Table-top hard X-ray sources driven by laser wakefield accelerators (LWFA) are one candidate to replace the extensive synchrotron radiation facilities. The experimental condition based on the NCU 100TW laser to generate high brightness and polarized X-ray is examined numerically in this study. Simulations demonstrate that the spectrum of the shock-front-injected electrons has a narrow energy spread < 2.43 %. Electrons injected from one side of the plasma wave significantly increase thanks to the tilted shock front (TSF), and their trajectories are more coherent than the un-tilted injection. Polarized X-rays are expected to be produced by such electron beams undergoing betatron oscillation within the wakefield.

Keywords: laser wakefield, X-ray, electron acceleration, betatron radiation