强激光产生的强磁场及其对弓激波的影响

发布时间：2018-02-25 07:11

本文关键词： 强激光强磁场产生弓激波磁化等离子体　出处：《物理学报》2017年09期 　论文类型：期刊论文

【摘要】：强激光照射金属线圈后,会在打靶点附近的背景等离子体中诱发冷电子的回流,在金属丝内形成强电流源,从而产生强磁场.本文利用神光II高功率激光器产生的强激光照射金属丝靶,产生了围绕金属丝的环形强磁场.利用B-dot对局域磁感应强度进行了测量,根据测量结果,结合三维模拟程序,反演得到磁场的空间分布.再利用强激光与CH平面靶相互作用产生的超音速等离子体撞击该金属丝,产生了弓激波.通过光学成像手段研究了磁场对冲击波的影响,发现磁场使得弓激波的轮廓变得不明显并且张角变大.同时,通过实验室天体物理定标率,将金属丝表面等离子参数变换到相应的天体参数中,结果证明利用该实验方法可以在实验室中产生类似太阳风的磁化等离子体.
[Abstract]:After the intense laser irradiates the metal coil, it will induce the reflux of the cold electron in the background plasma near the target point and form a strong current source in the wire. In this paper, the strong ring magnetic field around the wire is produced by using the intense laser produced by Shenguang II high power laser, and the local magnetic induction intensity is measured by B-dot. The spatial distribution of magnetic field was obtained by using 3D simulation program, and the supersonic plasma produced by the interaction between intense laser and Ch plane target was used to impact the wire. The effect of magnetic field on shock wave is studied by optical imaging, and it is found that magnetic field makes the profile of bow shock wave become less obvious and the angle of tension becomes larger. At the same time, the calibration rate of astrophysics in laboratory is used. The surface plasma parameters of the wire are transformed into the corresponding celestial parameters. The results show that the magnetized plasma similar to the solar wind can be produced in the laboratory by using this experimental method.
【作者单位】：中国科学院物理研究所北京凝聚态物理国家实验室;中国科学院大学物理科学学院;上海交通大学IFSA协同创新中心;中国科学院国家天文台;北京师范大学天文系;中国科学院上海光学精密机械研究所高功率激光与物理国家实验室;中国工程物理研究院上海激光等离子体研究所;上海交通大学激光等离子体实验室(教育部)物理与天文系;
【基金】：国家重点基础研究发展计划(批准号:2013CBA01501) 国家自然科学基金(批准号:11135012,11375262,11520101003,11503041) 科学挑战计划(批准号:TZ2016005)资助的课题~~
【分类号】：TN249;O53

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