【摘要】 利用铝丝和钨丝混合编制的丝阵作为Z 箍缩的负载 ,在俄罗斯Kurchatov研究所的S 30 0强流装置上对其Z 箍缩过程进行了实验研究 ,并与纯铝丝阵和纯钨丝阵的实验结果进行了比较 .不同材料组成的丝阵的Z 箍缩x射线能谱之间有明显差异 ,混编丝阵的铝K壳层的x射线辐射强度比纯铝丝阵的弱 ,在纯钨丝阵Z 箍缩中没有发现波长小于 1 6nm的线辐射 .混编丝阵Z 箍缩的x射线发光区域比纯铝丝阵的小 ,但比纯钨丝阵的大 ,混编丝阵的x射线产额比纯铝丝阵的大 ,但比纯钨丝阵的略低 .在驱动电流为 2 5— 2 8MA条件下 ,Z 箍缩的径向收缩比为 4— 5 ,x射线辐射脉冲脉宽为 2 5ns左右 ,峰值为 0 3— 0 5TW ,总能量为 10— 2 0kJ.激光探针的阴影像显示了丝阵等离子体形成的细致过程 ,还表明了等离子体的边界面不够清晰 ,其不稳定性有明显的发展 ,内部有丰富的结构 .更多还原

【Abstract】 In the form of joint experiment between China and Russia, the experimental studies of Z-pinches of mixed wire array of aluminum (A1) and tungsten (W) were carried out on S-300 generator,which was located on Kurchatov Institute of Russia. The experimental results were compared with those of single A1 array and single W array, respectively. There are obvious difference between mixed one and single one in their photon spectral distributions. The intensity of K-series emission lines from the mixed wire array Z-pinch is lower than that from single A1 array. The radiated lines with wavelengths less than 1.6nm were not found in single W array Z-pinches. In the Z-pinch processes, the area radiating x-arys in mixed wire array is smaller than that of single A1 array, but is larger than that of single W array. The radiated energy from mixed wire array Z-pinch is higher than that from single A1 array, but is slightly lower than that from single W array. The FWHM of x-ray pulse with a maximal power 0.3—0.5TW and total energy 10—20kJ is about 25ns, which radiated from Z-pinches with a radial convergence of 4—5 on S-300 generator. The shadow photograph of the mixed wire-array Z-pinch plasma by laser probe shows that the core-corona configuration was formed and the corona was moving toward the center axis during the wire-array plasma formation, that the interface of the plasma is not clear, and that therer are a number of structures inside. They also suggests that there was an obvious development of Magneto Rayleigh-Taylor instability in the Z-pinch process as well.更多还原