2026-10-14T14:25:23Z https://www.scidb.cn/oai

10.57760/sciencedb.43686 2026-07-21T16:10:34Z

2026-07-21 High-Flux Betatron X-ray Generation from Beam-Loading-Assisted Laser Wakefield Acceleration in Density-Tailored Plasmas doi:10.57760/sciencedb.43686 en Here we report a synergistic enhancement of betatron radiation based on beam-loading-assisted laser wakefield acceleration in a density-tailored plasma. The density profile consists of a two-section longitudinal up-ramp, with a gradual increase in a low-density region followed by a sharp rise near the capillary exit, enabling coordinated control of electron acceleration and betatron oscillations. In the low-density region, the gradual density increase keeps electrons in the accelerating phase, producing GeV-class beams and inducing strong beam loading that reshapes the wakefield. The rapid density rise near the capillary exit further enhances betatron oscillations, leading to synergistically enhanced radiation. With this scheme, an average flux exceeding 1014 photons per steradian above 5 keV, an order of magnitude higher than the earlier reports, along with the critical energy 71±8 keV, and a full width at half maximum divergence (6.1±1.9)×(5.8±1.6) mrad2 of betatron radiation were experimentally obtained. Particle-in-cell simulations are further performed to reproduce the electron acceleration and radiation processes under the experimental conditions, showing good agreement with the experimental observations and confirming the feasibility of this synergistic enhancement scheme. betatron radiation; laser wakefield accelerator; X-rays Hong Zhang Gaojie Zeng Hang Guo Xizhuan Zhuan Jianmeng Wei Mengyuan Chu Jiale Zheng Hao Wang Kangnan Jiang Zhihai Shu Dian Su Qiaokai Chen Hai Jiang Yanjie Ge Runshu Hu Jia Wang Jiayi Qian Jiacheng Zhu ZongxinZhang Yi Xu Yuxin Leng Song Li Ke Feng Wentao Wang Ruxin Li RESTRICTED dataset Science Data Bank