1. Electron acceleration and X-ray generation from near-critical-density carbon nanotube foams driven by moderately relativistic lasers
- Author
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Pan, Zhuo, Liu, Jianbo, Wang, Pengjie, Mei, Zhusong, Cao, Zhengxuan, Kong, Defeng, Xu, Shirui, Liu, Zhipeng, Liang, Yulan, Peng, Ziyang, Xu, Tianqi, Song, Tan, Chen, Xun, Wu, Qingfan, Zhang, Yujia, Han, Qihang, Chen, Haoran, Zhao, Jiarui, Gao, Ying, Chen, Shiyou, Zhao, Yanying, Yan, Xueqing, Shou, Yinren, and Ma, Wenjun
- Subjects
Physics - Plasma Physics ,Physics - Accelerator Physics - Abstract
Direct laser acceleration of electrons in near-critical-density (NCD) carbon nanotube foams (CNFs) has its advantages in the high-efficiency generation of relativistic electrons and broadband X-rays. Here, we report the first simultaneous measurement on the spectra of laser-driven electrons and X-rays from CNFs at moderately relativistic intensities of around 5\times{10}^{19}\ W/cm^2.\ The density and thickness of the CNFs were scanned in the experiments, indicating the optimized electrons temperature of 5.5 MeV and X-ray critical energy of 5 keV. Two-dimensional (2D) particle-in-cell (PIC) simulations confirm that the electrons, with a temperature significantly higher than the pondermotive scale, are directly accelerated by the laser along the NCD plasma channel, while the bright X-rays are emitted by these electrons through betatron radiation or Thomson backscattering inside the channel. The simultaneously generated electrons and X-rays, automatically synchronized with the femtosecond laser driver, are suitable for applications such as bi-modal radiography., Comment: arXiv admin note: text overlap with arXiv:2010.05702
- Published
- 2024