Guan Jiabao, Lei Qiannan, Zhong Jianhua, Liu Lanxin, Nie Yuancun, Xia Guoxing, Wang Jike
The Institute for Advanced Studies, Wuhan University, Wuhan, 430072, China.
Advanced Light Source Research Center, Wuhan University, Wuhan, 430072, China.
Sci Rep. 2025 Apr 6;15(1):11774. doi: 10.1038/s41598-025-90741-6.
Intense electric fields generated by laser plasma wakefield accelerators can rapidly accelerate electrons to high energies over short distances, potentially reducing both the length and cost of accelerator facilities significantly. However, the electron beams produced often exhibit substantial energy spreads, which imposes significant constraints on their broader applicability. We propose a novel method for reducing energy spread by utilizing periodic changes in the acceleration field slope induced by mismatched plasma channels, allowing for periodic compensation of the energy spread. Simulations of a 1 GeV, 10 pC electron accelerator demonstrate that this method can reduce the energy spread of the electron beam to 0.17%, while effectively preserving other beam quality parameters. This approach is approaching the state-of-the-art in laser plasma wakefield accelerators and holds promise for applications in free electron lasers and synchrotron radiation source injectors.
激光等离子体尾波场加速器产生的强电场能够在短距离内迅速将电子加速到高能量，这有可能显著缩短加速器设施的长度并降低成本。然而，所产生的电子束通常具有较大的能量分散，这对其更广泛的应用施加了重大限制。我们提出了一种新颖的方法，通过利用不匹配等离子体通道引起的加速场斜率的周期性变化来减少能量分散，从而实现对能量分散的周期性补偿。对一台1 GeV、10 pC的电子加速器进行的模拟表明，该方法能够将电子束的能量分散降低至0.17%，同时有效保持其他束流品质参数。这种方法正在接近激光等离子体尾波场加速器的当前技术水平，并有望应用于自由电子激光器和同步辐射源注入器。
