紫外激光探针在Z-pinch中的应用

发布时间：2018-06-22 13:20

本文选题：Z-箍缩 + 紫外探针　；参考：《强激光与粒子束》2017年04期

【摘要】：报道了基于脉冲宽度为16ns、波长为266nm、总能量为30mJ、时间分辨为1.6ns的紫外激光四分幅阴影成像系统,用于研究Z-pinch产生等离子体与在丝阵负载中心放置塑料泡沫材料相互作用输运规律,研究动态黑腔形成过程的主要物理因素。使用高能高密度激光束透射等离子体,依据等离子体对激光束吸收衰减特性诊断激光束通过等离子体后的空间强度分布,通过理论计算获得等离子体空间密度分布,获得等离子体产生的早期稳定性、箍缩速度等规律。实验研究表明,在X射线峰值前约-25ns等离子体开始压缩塑料泡沫,在峰值前-5ns压缩到最小,之后泡沫开始膨胀。在X射线峰值时刻泡沫直径由3mm压缩到直径约为1mm,对泡沫的最大压缩比约为9倍。实验测量压缩速度约为3.3×10~6 cm/s,并给出了不同时刻的磁流体不稳定结构分布。
[Abstract]:Based on the pulse width of 16ns, wavelength of 266nm, total energy of 30mJ and time resolution of 1.6ns, this paper reports an ultraviolet laser quadrilateral shadow imaging system, which is used to study the interaction between Z-pinch plasma and plastic foam materials placed in the center of wire array load. The main physical factors of dynamic black cavity formation are studied. Using high energy and high density laser beam transmitted plasma, the spatial intensity distribution of laser beam passing through plasma is diagnosed according to the characteristic of absorption and attenuation of laser beam by plasma, and the spatial density distribution of plasma is obtained by theoretical calculation. The early stability and pinch velocity of plasma are obtained. The experimental results show that the plasmas begin to compress the plastic foam before the peak X ray peak, and then the foam begins to expand after the compression of -5 ns to the minimum before the peak value. The diameter of foam is compressed from 3mm to about 1 mm at the peak time of X-ray, and the maximum compression ratio of foam is about 9 times. The compression velocity is about 3.3 脳 10 ~ (-6) cm / s, and the unstable structure distribution of magnetic fluid at different times is given.
【作者单位】：中国工程物理研究院核物理与化学研究所;
【基金】：国家自然科学基金项目(11475153)
【分类号】：TN23

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