| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Effect of the magnetization parameter on electron acceleration during relativistic magnetic reconnection in ultra-intense laser-produced plasma |
| Qian Zhang(张茜)1,2, Yongli Ping(平永利)1,2,†, Weiming An(安维明)1, Wei Sun(孙伟)1, and Jiayong Zhong(仲佳勇)1,‡ |
1 Department of Astronomy, Beijing Normal University, Beijing 100875, China;
2 CAS Key Laboratory of Geospace Environment, University of Science&Technology of China, Hefei 230026, China |
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Abstract Relativistic magnetic reconnection (MR) driven by two ultra-intense lasers with different spot separation distances is simulated by a three-dimensional (3D) kinetic relativistic particle-in-cell (PIC) code. We find that changing the separation distance between two laser spots can lead to different magnetization parameters of the laser plasma environment. As the separation distance becomes larger, the magnetization parameter σ becomes smaller. The electrons are accelerated in these MR processes and their energy spectra can be fitted with double power-law spectra whose index will increase with increasing separation distance. Moreover, the collisionless shocks' contribution to energetic electrons is close to the magnetic reconnection contribution with σ decreasing, which results in a steeper electron energy spectrum. Basing on the 3D outflow momentum configuration, the energetic electron spectra are recounted and their spectrum index is close to 1 in these three cases because the magnetization parameter σ is very high in the 3D outflow area.
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Received: 03 August 2021
Revised: 05 October 2021
Accepted manuscript online: 27 October 2021
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PACS:
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52.50.Lp
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(Plasma production and heating by shock waves and compression)
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94.30.cp
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(Magnetic reconnection)
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52.38.Fz
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(Laser-induced magnetic fields in plasmas)
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| Fund: This work was supported by the National Natural Science Foundation of China (Grant Nos. U1930108,12175018, 12135001, 12075030, and 11903006) and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA25030700). Yongli Ping acknowledges the support of the Open Research Program from Key Laboratory of Geospace Environment CAS. |
Corresponding Authors:
Yongli Ping, Jiayong Zhong
E-mail: ylping@bnu.edu.cn;jyzhong@bnu.edu.cn
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Cite this article:
Qian Zhang(张茜), Yongli Ping(平永利), Weiming An(安维明), Wei Sun(孙伟), and Jiayong Zhong(仲佳勇) Effect of the magnetization parameter on electron acceleration during relativistic magnetic reconnection in ultra-intense laser-produced plasma 2022 Chin. Phys. B 31 065203
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