天光Ⅱ-B光源的初步实验

Preliminary Experiments on Light Ⅱ-B

天光Ⅱ-B是在天光Ⅱ-A的油箱侧面建立而成,利用原有的Marx发生器,以及新建的脉冲形成线、主开关、脉冲传输线、负载腔构成一条新的实验线路。在保留装置原有泵浦激光能力的基础上,可同时进行X-pinch相关实验研究。脉冲形成线内导体为同轴线结构,特征阻抗6Ω,工作介质为去离子水,研制了一种真空水压的方式对形成线进行灌注,有效消除形成线内水中的气泡。采用Rogowski线圈对流过金属丝负载的电流进行测量。本文进行了天光Ⅱ-B在真负载下的初步实验。结果表明,在对Marx电容器充电70kV时,输出电流269kA,脉宽约50ns,上升沿≤30ns,丝负载对电流利用率约80%。

The Light Ⅱ-B was built at the side of the Marx tank of Light Ⅱ-A for X-pinch testing.It is composed of an old Marx generator,a new pulse forming line（PFL）,a new gas-filled switch,a new pulse transmission line（PTL） and a new cavity load.The Light Ⅱ-B not only keeps its original ability of KrF,but also can be used for X-pinch research.The pulse forming line was a water-filled coaxial transmission line with the output impendence of 6 Ω,which was filled with deionized water using a new vacuum pressure technique.The Rogowski coil was adopted to measure the current crossing the load.The preliminary experiment was done with cavity load.The results show that for the 269 kA/50 ns pulse power generator（Light Ⅱ-B） for X-pinch experiments,the current rise time is no more than 30 ns when the Marx generator charge is 1.4 MV,and about 80% of the current can be used by the load.