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Strong magnetic fields generated with a metal wire irradiated by high power laser pulses and its effect on bow shock

文献类型：期刊论文

作者Li Yan-Fei1,9; Li Yu-Tong1,8,9; Zhu Bao-Jun1,9; Yuan Da-Wei2; Li Fang1; Zhang Zhe1; Zhong Jia-Yong3,8; Wei Hui-Gang2; Pei Xiao-Xing2; Liu Chang3
刊名ACTA PHYSICA SINICA
出版日期2017-05-05
卷号66期号:9
关键词high power laser produce of strong magnetic fields bow shock magnetized plasma
英文摘要Laboratory astrophysics is a rapid developing field studying astrophysical or astronomical processes on a high-power pulsed facility in laboratory. It has been proved that with the similarity criteria, the parameters in astrophysical processes can be transformed into those under laboratory conditions. With appropriate experimental designs the astrophysical processes can be simulated in laboratory in a detailed and controlled way. Magnetic fields play an important role in many astrophysical processes. Recently, the generation of strong magnetic fields and their effects on relevant astrophysics have attracted much interest. According to our previous work, a strong magnetic field can be induced by a huge current formed by the background cold electron flow around the laser spot when high power laser pulses irradiate a metal wire. In this paper we use this scheme to produce a strong magnetic field and observe its effect on a bow shock on the Shenguang II (SG II) laser facility. The strength of the magnetic field is measured by B-dot detectors. With the measured results, the magnetic field distribution is calculated by using a three-dimension code. Another bunch of lasers irradiates a CH planar target to generate a high-speed plasma. A bow shock is formed in the interaction of the high-speed plasma with the metal wire under the strong magnetic condition. The effects of the strong magnetic field on the bow shock are observed by shadowgraphy and interferometry. It is shown that the Mach number of the plasma flow is reduced by the magnetic field, leading to an increase of opening angle of the bow shock and a decrease of the density ratio between downstream and upstream. In addition, according to the similarity criteria, the experimental parameters of plasma are scaled to those in space. The transformed results show that the magnetized plasma around the wire, produced by X-ray emitted from the laser-irradiated planar target in the experiment, is suitable for simulating solar wind in astrophysics. In this paper, we provide another method to produce strong magnetic field, apply it to a bow shock laboratory astrophysical study, and also generate the magnetized plasma which can be used to simulate solar wind in the future experiments.
WOS标题词Science & Technology ; Physical Sciences
类目[WOS]Physics, Multidisciplinary
研究领域[WOS]Physics
关键词[WOS]SOLAR-WIND ; RECONNECTION ; DRIVEN ; PLASMAS
收录类别SCI
语种英语
WOS记录号WOS:000403077300029
源URL[http://ir.bao.ac.cn/handle/114a11/8808]  
专题国家天文台_光学天文研究部
作者单位1.Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
3.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
4.Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, Natl Lab High Power Lasers & Phys, Shanghai 201800, Peoples R China
5.China Acad Engn Phys, Shanghai Inst Laser Plasma, Shanghai 201800, Peoples R China
6.Shanghai Jiao Tong Univ, Lab Laser Plasmas, Minist Educ, Shanghai 200240, Peoples R China
7.Shanghai Jiao Tong Univ, Dept Phys & Astron, Shanghai 200240, Peoples R China
8.Shanghai Jiao Tong Univ, Collaborat Innovat Ctr IFSA, Shanghai 200240, Peoples R China
9.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Li Yan-Fei,Li Yu-Tong,Zhu Bao-Jun,et al. Strong magnetic fields generated with a metal wire irradiated by high power laser pulses and its effect on bow shock[J]. ACTA PHYSICA SINICA,2017,66(9).
APA Li Yan-Fei.,Li Yu-Tong.,Zhu Bao-Jun.,Yuan Da-Wei.,Li Fang.,...&Zhang Jie.(2017).Strong magnetic fields generated with a metal wire irradiated by high power laser pulses and its effect on bow shock.ACTA PHYSICA SINICA,66(9).
MLA Li Yan-Fei,et al."Strong magnetic fields generated with a metal wire irradiated by high power laser pulses and its effect on bow shock".ACTA PHYSICA SINICA 66.9(2017).

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来源：国家天文台

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