| 激光加速质子束空间电荷力研究 |
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| 作者姓名： | Zhu Jungao Zhao Yuan Lai Meifu Gu Yongli Xu Shixiang Zhou Cangtao Lu Haiyang |
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| 作者单位： | 1.深圳技术大学 工程物理学院，先进材料测试技术研究中心，深圳市超强激光与先进材料技术重点实验室，广东 深圳 518118 |
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| 摘 要： | 激光加速器可以输出具有独特品质的质子束，例如μm尺寸、ps脉冲长度和高峰值电流。强流粒子束的空间电荷力效应较强，对面向应用的束流传输提出了挑战。通过二维PIC模拟研究了激光加速后与质子速度接近的电子的影响。采用椭球模型估算空间电荷力的影响，比较不同电荷分布的差异。结果表明每束团质子数超过1010后空间电荷力显著影响质子束传输，甚至严重破坏束流品质。空间电荷力的影响在20 ps后显著减弱，离开靶约1.2 mm。
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| 关 键 词： | 激光加速 质子束 空间电荷力 高亮度 |
| 收稿时间： | 2022-05-24 |
Study of space charge force for a laser-accelerated proton beam |
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| Zhu Jungao,Zhao Yuan,Lai Meifu,Gu Yongli,Xu Shixiang,Zhou Cangtao,Lu Haiyang.Study of space charge force for a laser-accelerated proton beam[J].High Power Laser and Particle Beams,2023,35(2):021004-1-021004-8. |
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| Affiliation: | 1.Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology, Center for Advanced Material Diagnostic Technology, College of Engineering Physics, Shenzhen Technology University, Shenzhen 518118, China2.Shenzhen Key Laboratory of Micro-Nano Photonic Information Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China |
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| Abstract: | Laser accelerators can provide proton beams with unique qualities, such as micron size, picosecond pulse duration and high peak current, and have been demonstrated for various applications and for scientific research purposes. The effect of the space charge force in high peak current beams is strong and raises challenges for application after beam transportation. We performed two-dimensional particle-in-cell simulations and studied the influence of electrons that have velocities close to that of the protons after laser acceleration. We employed ellipsoid models with different charge distributions to estimate the effects of the space charge force. Results demonstrate that space charge will affect beam transmission, and even lead to complete transmission failure if the number of protons per pulse exceeds 1010. The influence of the space charge force diminishes greatly after 20 ps, which corresponds to approximately 1.2 mm from the target. |
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