“强光一号”单排平面型铝丝阵Z箍缩实验研究

利用"强光一号"装置开展了排宽度6~24 mm、丝根数10~34、不同参数的单排平面型铝丝阵Z箍缩实验研究,重点研究了不同负载参数下平面型丝阵Z箍缩内爆、辐射特性随负载参数的变化规律。结果表明:平面型丝阵负载内爆过程存在先驱等离子体柱、拖尾质量等,并伴随着R-T不稳定性;在滞止后期等离子体箍缩柱受扭曲不稳定性影响明显;不同参数负载聚爆时间取决于线质量与排宽度平方的乘积值;以辐射能衡量的最优化值应位于200~400μg·cm之间,在相同值下丝间距应选择在1 mm以下为宜。实验获得的平面型铝丝阵最大X射线辐射能量22 kJ,峰值功率630 GW,最大K层辐射能量3.9 kJ,K层辐射功率158 GW。

Experimental researches on single aluminum planar-wire-array Z-pinches on Qiangguang generator

Planar wire arrays Z pinches were conducted on Qiangguang generator (1.5 MA, 100 ns). The loads in the experiments varied their row widths (6-24 mm) and wire numbers (10-34). The scaling of the implosion times, radiation yields and power with the parameter of the loads, such as array masses, inter-wire gaps, and array widths were investigated. The images of the soft X-ray camera show that the trailing mass, precursor column, and R-T instability exist during the implosion phase, and kink instability will occur and rapidly develop after stagnation. The experimental results show that the product of the line mass and the square row width is a critical factor. This factor can affect the implosion times and the X-ray products of wire arrays with different parameters, the optimum range is 200~400 gcm for Qiangguang generator. The results also imply that the inter-wire gap should be smaller than 1 mm. The maximum X-ray total energy is 22 kJ with the peak power 630 GW while the maximum K-shell product is 3.9 kJ with 158 GW.