Current situation and development trend analysis of femtosecond laser Betatron radiation source
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摘要: 在过去的几十年里,超短超强激光在等离子体中激发尾场加速电子束取得了长足的发展,基于该方式获得的高能电子束可以应用于辐射源的产生,其产生的高亮度强辐射源受到了广泛的关注。介绍了超短超强激光脉冲与低密度等离子体相互作用产生Betatron辐射的基本原理和研究现状;结合X-ray应用需求分析了Betatron辐射的发展趋势,发现迫切需要发展基于紧凑型激光装置的尾场电子加速新方案,以突破Beam-loading效应对电量的限制,产生大电量电子束,进而获得高流强的Betatron辐射源;介绍了北京大学颜学庆教授领导的联合团队利用数百TW飞秒激光产生10 nC级大电量高能电子束和单发光子数目为
$ 1.0\times {10}^{12} $ 的Betatron辐射源的新方案。-
关键词:
- 激光辐射源 /
- 等离子体 /
- 飞秒激光 /
- Betatron辐射
Abstract: In the past decades, great progress has been made in laser wakefield acceleration of electron beam inspired by ultra-short intense lasers in plasma. The high-energy electron beam obtained by this method can be applied to the generation of the high-brightness and intense radiation sources, which have attracted extensive attention. In this paper, the basic principle and research status of Betatron radiation generated by laser wakefield acceleration are briefly introduced. The development trend of Betatron radiation is analyzed in combination with the X-ray application requirements. It is found that there is an urgent need to develop a new scheme of laser wakefield electron acceleration based on compact laser device to break through the limit of beam-loading effect on electron charge. By this means, one can generate large charge electron beam and high flux Betatron radiation source. Finally, a new scheme is briefly introduced to generate 10 nC high-energy electron beam and the photon number of Betatron radiation source reach$ 1.0\times {10}^{12} $ /shot using hundreds of TW femtosecond laser by a joint team led by Professor Yan Xueqing at Peking Univesity.-
Key words:
- laser radiation source /
- plasma /
- femtosecond laser /
- Betatron radiation
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图 2 当a0=20,ne=0.1nc时,不同时刻激光与等离子体相互作用过程中等离子体空泡的形成、电子束的注入、电子束与激光共振、空泡不稳定性发展等过程
Figure 2. When a0=20,ne=0.1nc, the formation of plasma bubble, injection of electron beam, resonance of electron beam and laser, development of bubble instability and other processes during the interaction between laser and plasma at different moments
表 1 相关Betatron辐射源实验结果统计
Table 1. Statistics of related Betatron radiation source experiments
author brilliance photon number per shot Ec/keV A. Rousse[37], 2004 2×1022 ph·s−1·mm−2·mrad−2·(0.1%bw)−1 1×108 2 S. Kneip[38], 2008 1×1017 ph·s−1·mm−2·mrad−2·(0.1%bw)−1 N/A 36 S. Mangles[39], 2009 N/A 3×107 5 D. Thorn[40], 2010 N/A 1×108 1.5 G. Genoud[41], 2011 5 × 104 ph·mrad−2 1×108 1.3 S. Cipiccia[22], 2011 1×1023 ph·s−1·mm−2·mrad−2·(0.1%bw)−1 5×108 50 S. Fourmaux[42], 2011 2.2×108 ph·(0.1%bw)−1·sr−1 1×109 12.3 J. Ju[43], 2012 1×1021 ph·(0.1%bw)−1·sr−1 1×109 4.6 M. Schnell[19], 2012 5×1021 ph·(0.1%bw)−1·sr−1 2×106 6 X. Wang[44], 2013 N/A 1×109 30 L. Chen[27], 2013 5×1021 ph·(0.1%bw)−1·sr−1 2×108 2.4 M. Schnell[45], 2013 N/A 5×107 3 Y. Ho[46], 2013 N/A 2.2×108 3.3 J. Wenz[47], 2015 2×1022 ph·(0.1%bw)−1·sr−1 5×107 5.2 J. M. Cole[48], 2015 1.1×1021 ph·(0.1%bw)−1·sr−1 1.3×109 33 K. Huang[49], 2016 N/A 8×108 75 A. Dopp[50], 2018 1.6×109 ph·msr−1·s−1 1×108 N/A J. Feng[36], 2019 1.8 ×1020 ph·msr−1·s−1 7 × 107 N/A Y. F. Li[29], 2020 N/A 1013 ph·sr−1 N/A X. F. Shen[31], 2021 3.3×1020 ph·msr−1·s−1 7×1011 5 -
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