| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Divergence angle consideration in energy spread measurement for high-quality relativistic electron beam in laser wakefield acceleration |
| Guang-Wei Lu(卢光伟)1, Yao-Jun Li(李曜均)1, Xi-Chen Hu(胡曦辰)1, Si-Yu Chen(陈思宇)1, Hao Xu(徐豪)1, Ming-Yang Zhu(祝铭阳)1, Wen-Chao Yan(闫文超)1,2,†, and Li-Ming Chen(陈黎明)1,2,‡ |
1 Key Laboratory for Laser Plasmas of Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China;
2 IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China |
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Abstract The thorough exploration of the transverse quality represented by divergence angle has been lacking yet in the energy spread measurement of the relativistic electron beam for laser wakefield acceleration (LWFA). In this work, we fill this gap by numerical simulations based on the experimental data, which indicate that in a C-shape magnet, magnetic field possesses the beam focusing effect, considering that the divergence angle will result in an increase in the full width at half maxima (FWHM) of the electron density distribution in a uniformly isotropic manner, while the length-to-width ratio decreases. This indicates that the energy spread obtained from the electron deflection distance is smaller than the actual value, regardless of the divergence angle. A promising and efficient way to accurately correct the value is presented by considering the divergence angle (for instance, for an electron beam with a length-to-width ratio of 1.12, the energy spread correct from 1.2% to 1.5%), providing a reference for developing the high-quality electron beam source.
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Received: 24 November 2023
Revised: 26 December 2023
Accepted manuscript online: 28 February 2024
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PACS:
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41.75.Ht
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(Relativistic electron and positron beams)
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52.38.Kd
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(Laser-plasma acceleration of electrons and ions)
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02.70.Dh
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(Finite-element and Galerkin methods)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2021YFA1601700), the National Natural Science Foundation of China (Grant Nos. 12074251, 11991073, 12335016, 12305272, and 12105174), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant Nos. XDA25000000 and XDA25030400), and Yangyang Development Fund, China. |
Corresponding Authors:
Wen-Chao Yan, Li-Ming Chen
E-mail: wenchaoyan@sjtu.edu.cn;lmchen@sjtu.edu.cn
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Cite this article:
Guang-Wei Lu(卢光伟), Yao-Jun Li(李曜均), Xi-Chen Hu(胡曦辰), Si-Yu Chen(陈思宇), Hao Xu(徐豪), Ming-Yang Zhu(祝铭阳), Wen-Chao Yan(闫文超), and Li-Ming Chen(陈黎明) Divergence angle consideration in energy spread measurement for high-quality relativistic electron beam in laser wakefield acceleration 2024 Chin. Phys. B 33 064101
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