强激光产生的强磁场及其对弓激波的影响

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	强激光产生的强磁场及其对弓激波的影响
	李彦霏 1; 李玉同 1; 朱保君 1; 袁大伟 2; 李芳 1; 张喆 1; 仲佳勇 3; 魏会冈 2; 裴晓星 2; 刘畅 3
刊名	物理学报
	2017
卷号	66 期号:9
ISSN号	1000-3290
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.
资助项目	[National Basic Research Program of China] ; [National Natural Science Foundation of China] ; [Science Challenge Project]
语种	英语
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/51604]
专题	中国科学院国家天文台
作者单位	1.中国科学院物理研究所 2.中国科学院国家天文台 3.北京师范大学 4.中国科学院上海光学精密机械研究所 5.中国工程物理研究院上海激光等离子体所 6.上海交通大学
推荐引用方式 GB/T 7714	李彦霏,李玉同,朱保君,等. 强激光产生的强磁场及其对弓激波的影响[J]. 物理学报,2017,66(9).
APA	李彦霏.,李玉同.,朱保君.,袁大伟.,李芳.,...&张杰.(2017).强激光产生的强磁场及其对弓激波的影响.物理学报,66(9).
MLA	李彦霏,et al."强激光产生的强磁场及其对弓激波的影响".物理学报 66.9(2017).