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; 原晓霞2; 赵家瑞1; 韩波2; 廖国前1; 鲁欣1; 华能4; 朱宝强4; 朱健强4; 方智恒5; 安红海5; 黄秀光5; 赵刚2; 张杰6
Source Publication物理学报
AbstractLaboratory 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.
Funding Project[National Basic Research Program of China] ; [National Natural Science Foundation of China] ; [Science Challenge Project]
Document Type期刊论文
Recommended Citation
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).
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