Application of multi-pulse optical imaging to measure evolution of laser-produced counter-streaming flows

doi:10.1088/1674-1056/26/5/054206

Abstract

A counter-streaming flow system is a test-bed to investigate the astrophysical collisionless shock (CS) formation in the laboratory. Electrostatic/electromagnetic instabilities, competitively growing in the system and exciting the CS formation, are sensitive to the flows parameters. One of the most important parameters is the velocity, determining what kind of instability contributes to the shock formation. Here we successfully measure the evolution of the counter-streaming flows within one shot using a multi-pulses imaging diagnostic technique. With the technique, the average velocity of the high-density-part (n_e≥ 8-9×10¹⁹ cm^-3) of the flow is directly measured to be of ～ 10⁶ cm/s between 7 ns and 17 ns. Meanwhile, the average velocity of the low-density-part (n_e ≤ 2×10¹⁹ cm^-3) can be estimated as ～ 10⁷ cm/s. The experimental results show that a collisionless shock is formed during the low-density-part of the flow interacting with each other.

Keywords: collisionless shock electrostatic/electromagnetic instabilities imaging diagnostic technique

Received: 04 November 2016
Revised: 06 December 2016
Accepted manuscript online:

PACS:	42.30.-d	(Imaging and optical processing)
	47.80.Jk	(Flow visualization and imaging)
	52.35.Tc	(Shock waves and discontinuities)
	52.35.Fp	(Electrostatic waves and oscillations (e.g., ion-acoustic waves))

Fund:

Project supported by the National Basic Research Program of China (Grant No. 2013 CBA01501/3), the National Natural Science Foundation of China (Grant Nos. 11503041, 11135012, 11375262, 11573040, 11574390, and 11220101002), and China Postdoctoral Science Foundation (Grant No. 2015M571124).

Corresponding Authors: Yutong Li, Gang Zhao, Jie Zhang
E-mail: ytli@iphy.ac.cn;gzhao@bao.ac.cn;jzhang1@sjtu.edu.cn

Cite this article:

Dawei Yuan(袁大伟), Yutong Li(李玉同), Baojun Zhu(朱保君), Yanfei Li(李彦霏), Jiayong Zhong(仲佳勇), Huigang Wei(魏会冈), Chang Liu(刘畅), Xiaoxia Yuan(原晓霞), Zhe Zhang(张喆), Guiyun Liang(梁贵云), Feilu Wang(王菲鹿), Fang Li(李芳), Jiarui Zhao(赵家瑞), Neng Hua(华能), Baoqiang Zhu(朱宝强), Jianqiang Zhu(朱健强), Shaoen Jiang(江少恩), Kai Du(杜凯), Yongkun Ding(丁永坤), Gang Zhao(赵刚), Jie Zhang(张杰) Application of multi-pulse optical imaging to measure evolution of laser-produced counter-streaming flows 2017 Chin. Phys. B 26 054206

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