单层丝阵负载Z箍缩内爆辐射特性研究

在电流3—4MA的Angara-5-1脉冲装置上进行了单层钨丝阵Z箍缩实验,利用具有坪响应的X射线功率谱仪获得X射线功率,利用X射线纳秒分幅相机获得等离子体内爆辐射区图像.在丝阵直径相同时,实验得到较细的丝直径使得内爆较早,收缩比较大;较大的丝间隙使得内爆早期丝间等离子体不能有效的融合,而是较孤立的等离子体簇向内箍缩;较大的丝直径和丝间隙导致不稳定性波长较大.在丝阵直径不同,丝直径相当时,实验得到较大的丝阵直径内爆启动较早,具有较大的内爆速度,但等离子体在内爆过程中较分散.另外,较大的丝直径和丝阵直径使X射线辐射脉冲时间较宽.

Radiation characteristics of single wire array Z-pinch implosion

Single wire array Z-pinch experiments were carried out on the 3——4 MA Angara-5-1 facility employing a set of diagnostic equipment, including an X-ray power meter with platform response to record X-ray emission bursts and a time resolved pinhole camera to obtain soft X-ray images. Experimental results indicated that when the diameter of wire array was fixed, implosions of arrays with smaller wire diameter started earlier and had a larger convergence ratio. In addition, when the wire gap was larger, the wire plasma could not merge effectively but moved inward individually at an early imploding stage, and larger wire diameter with larger wire gap had longer instability wavelength. The results also showed that when the wire diameter was fixed, implosions of arrays with larger diameter started earlier and had higher implosion speeds and wider plasma dispersion during implosions. Implosions of arrays with larger wire and array diameter had longer pulse X-ray width.