新型金属丝靶电子源实验研究

Yin Jiapeng; Yuan Xiaohui; Zhou Zusheng; Pei Guoxi; Liu Shengguang

doi:10.11884/HPLPB202133.210244

新型金属丝靶电子源实验研究

doi: 10.11884/HPLPB202133.210244

殷佳鹏^1,,
远晓辉¹,
周祖圣^{2, 3},
裴国玺^{2, 3},
刘圣广^1, ,

1.
上海交通大学物理与天文学院协同创新中心激光等离子体教育部重点实验室，上海 200240
2.
中国科学院高能物理研究所，北京 100080
3.
中国科学院大学，北京 100049

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中图分类号: O539
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出版历程
- 收稿日期: 2021-06-18
- 修回日期: 2021-07-26
- 网络出版日期: 2021-09-04
- 刊出日期: 2021-09-15

Novel electron source based on interaction between high power laser and metal wire

Yin Jiapeng^1
,,
Yuan Xiaohui¹,
Zhou Zusheng^{2, 3},
Pei Guoxi^{2, 3},
Liu Shengguang^{1
, ,}

1.
Key Laboratory for Laser Plasmas (Ministry of Education), Collaborative Innovation Center of IFSA, School of Physics and Astronomy, Shanghai Jiaotong University, Shanghai 200240, China
2.
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100080, China
3.
University of the Chinese Academy of Sciences, Beijing 100049, China

Funds: National Natural Science Foundation of China (U1832185)

More Information

Author Bio:
Yin Jiapeng, yinjiapeng@sjtu.edu.cn

Corresponding author: Liu Shengguang, liushg@sjtu.edu.cn

摘要

摘要: 电子束在基础科学研究、工农业生产和医疗领域发挥了重要作用。提出了一种新型的电子源技术方案：高功率激光脉冲轰击金属丝靶，可以产生大量能量在百keV量级的热电子，一部分热电子在丝靶表面自生电磁场的作用下沿着丝靶运动，丝靶后方可以获得指向性良好的电子束。实验上成功在金、钨和铜丝靶后方获得了电子束团，测量了束团束斑、电荷量和能谱。铜丝靶单发实验收集到的电子束团总电荷量可达3 nC，能量分布在0～240 keV区间内，能谱在100 keV附近呈现峰值。提出了微波压缩方案，设计了2腔微波聚束腔，利用ASTRA对微波腔压缩过程进行了模拟计算。结果显示，可以将电荷量1 nC、长度55 ps的束团压缩至27 ps，满足后续微波加速器对电子源的要求。
- 电子束 /
- 激光脉冲 /
- 金属丝 /
- 束团压缩
Abstract: Electron source generates electron bunch and dominates the electron beam quality for an accelerator. We put forward a novel mechanism of electron source in this paper. A great amount of hot electrons with several hundred keV can be generated during the interaction process between high power laser and metal wire, and some of them fly forward along the wire, guided by EM field. We generate electron beam and measure beam parameters downstream the Au wire, W wire and Cu wire experimentally. 3 nC electrons can be collected by a Faraday-cup for a single shot. Electron energy spectrum is between 0−240 keV continually, and there is a density peak at 100 keV. RF buncher cavity can be used to compress the bunch length short enough for further RF acceleration in main accelerator. Start-to-end simulation has been done with ASTRA code. Electron beam with 55 ps length and 1 nC charge is injected into a 2-cell RF buncher cavity, it can be compressed into 27 ps long, which satisfies the general requirement of the main accelerator on the electron source.
- electron beam /
- laser pulse /
- metal wire /
- bunch compression

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Figure 1. Experimental layout

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Figure 2. Electron beam image on IP board. W wire target with d=0.03 mm，L=150 mm

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Figure 3. Electron beam profiles on two-layer IP board for three wires

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Figure 4. Electron spatial distribution on three-layer IP board for tungsten wire of different length

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Figure 5. Beamlet and energy spectrum

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Figure 6. E field in the 2-cell RF cavity

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Figure 7. Initial distribution of electron bunch

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Figure 8. Bunch length vs injection phase

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Figure 9. Average beam energy in the RF cavity and bunch length (RMS) in the cavity

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