螺旋线型水介质长脉冲形成线的设计与改进

 设计了长2.2 m、直径0.40 m、工作电压400 kV、脉宽200 ns的螺旋线型水介质脉冲形成线加速器，并进行了实验研究。为消除输出脉冲的前沿上冲和后沿拖尾现象，分析了脉冲形成线中的连接段与螺旋线阻抗的不匹配对输出波形的影响。用高分子材料加工了内径为10 cm，外径为18 cm的高阻抗环套在螺旋线与主开关之间的连接段上，使这一段的阻抗与螺旋线阻抗接近，并使其电长度减小，消除了前沿上冲，减弱了后沿拖尾，得到了上升沿约18 ns、下降沿约40 ns的近似方波高电压脉冲输出。

Design and improvement of water-dielectric helix long-pulse forming line

Based on a water-dielectric helix line,a 2.2 m long accelerator with a diameter of 0.4 m was designed and tested.The influence of the impedence mismatching between the joint section in pulse forming line and the helical line on the voltage waveform of the diode was analyzed.A high impedance annulus made of macromolecule material with an inner radius of 10 cm and an outer radius of 18 cm was added to the joint section.By making the impedance of the joint section be close to that of the helical line and the electric length minish,the upshot was eliminated,the fall time was minished,and a square pulse with a risetime about 18 ns,a fall time about 40 ns and a pulse top duration about 200 ns was obtained.