聚龙一号装置磁绝缘传输线的电流损失特性

Current Loss Properties of the Magnetically Insulated Transmission Line in the PTS Facility

聚龙一号装置是我国自主研制的首台多路并联超高功率脉冲装置,可根据物理实验的需要工作在不同的脉冲输出模式,负载上获得的电流脉冲前沿75~600 ns、峰值5~10 MA可调。4层圆盘锥型磁绝缘传输线是聚龙一号装置实现超高功率脉冲向负载传输的关键部件,磁绝缘传输线中产生的电流损失会对负载电流波形产生影响并使能量传输效率降低。为此,针对聚龙一号装置,通过全电路计算,在长短两种脉冲输出模式下,研究了磁绝缘传输线的电流损失特性。研究表明：对于电流前沿较快的Z-pinch实验类型,磁绝缘形成过程中外磁绝缘线的损失电流总和约为940 k A,磁绝缘形成后在柱孔汇流区的损失为330~743 k A;而对于前沿较慢的准等熵压缩实验类型,对应的损失分别为223 k A和77~174 k A。

The Primary Test Stand （PTS） is the first multi-modular high power facility in China, which can generate cur- rent pulse with rise time of 75-600 ns and amplitude of 5~10 MA, depending on different experimental setups. The four-level conical magnetically insulated transmission line （MITL）, as a key component for the PTS＇s pulse transmission, is decisive to the whole facility. Current loss occurring in MITL will change the waveform of load current and decrease the energy transmission efficiency. Hence, we studied the current loss of the MITL in PTS using full circuit simulation for both short and long current rise time. Results indicate that, in the Z-pinch experiment with fast current rising, the total loss in outer MITL during the establishment of magnetic insulation is about 940 kA and the loss in Double Post Hole Convo- lute （DPHC） after the establishment of magnetic insulation is 330-743 kA. For the Isentropic Compression Experiment （ICE）, in which the current rises slower, the corresponding losses are 223 kA and 77-174 kA, respectively.