Year
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(Peer-Reviewed) Mapping non-laminar proton acceleration in laser-driven target normal sheath field
Qin Chengyu 秦承宇 ¹ ², Zhang Hui 张辉 ¹ ³, Ji Liangliang 吉亮亮 ¹ ³, Li Shun 李顺 ¹, Zhai Shuhua ⁴, Li Angxiao 李昂骁 ¹ ⁵, Qian Jiayi 钱佳毅 ¹, Gui Jiayan 归佳彦 ¹, Wu Fenxiang 吴分翔 ¹, Zhang Zongxin 张宗昕 ¹, Xu Yi 许毅 ¹ ³, Liang Xiaoyan 梁晓燕 ¹ ³, Leng Yuxin 冷雨欣 ¹ ³, Shen Baifei 沈百飞 ¹ ⁴, Li Ruxin 李儒新 ¹ ³ ⁵
¹ State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
中国 上海 中国科学院上海光学精密机械研究所 强场激光物理国家重点实验室
² Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
中国 北京 中国科学院大学 材料科学与光电技术学院
³ CAS Center for Excellence in Ultra-intense Laser Science, Shanghai 201800, China
中国 上海 中国科学院 超强激光科学卓越创新中心
⁴ Department of Physics, Shanghai Normal University, Shanghai 200234, China
中国 上海 上海师范大学物理系
⁵ ShanghaiTech University, Shanghai 201210, China
中国 上海 上海科技大学
Abstract

We report on experimental observation of non-laminar proton acceleration modulated by strong magnetic field in laser irradiating micron-meter Aluminum targets. The results illustrate coexistence of ring-like and filamentation structures. We implement the knife edge method into the radiochromic film detector to map the accelerated beams, measuring source size of 30 ~ 110 μm for proton of > 5MeV. The diagnosis reveals that the ring-like profile originates from low energy protons far off the axis while the filamentation is from the near-axis high energy protons, exhibiting non-laminar features.

Particle-in-cell simulations reproduced the experimental results, showing that the short-term magnetic turbulence via Weibel instability and the long-term quasi-static annular magnetic field by the streaming electric current account for the measured beam profile. Our work provides direct mapping of laser-driven proton sources in the space-energy domain and reveals the non-laminar beam evolution at featured time scales.
Mapping non-laminar proton acceleration in laser-driven target normal sheath field_1
Mapping non-laminar proton acceleration in laser-driven target normal sheath field_2
Mapping non-laminar proton acceleration in laser-driven target normal sheath field_3
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