Kovalchuk B M, Kharlov A V, Zorin V B, Zherlitsyn A A
Institute of High Current Electronics, 2/3 Academichesky Ave., 634055 Tomsk, Russia.
Rev Sci Instrum. 2009 Aug;80(8):083504. doi: 10.1063/1.3193714.
Pulsed current generator was developed for experiments with current carrying pulsed plasma. Main parts of the generator are capacitor bank, low inductive current driving lines, and central load part. Generator consists of four identical sections, connected in parallel to one load. Capacitor bank is assembled from 24 capacitor blocks (100 kV, 80 nF), connected in parallel. It stores 9.6 kJ at 100 kV charging voltage. Each capacitor block incorporates a multigap spark switch, which is able to commute by six parallel channels. Switches operate in dry air at atmospheric pressure. The generator was tested with an inductive load and a liner load. At 17.5 nH inductive load and 100 kV of charging voltage it provides 650 kA of current amplitude with 390 ns rise time with 0.6 ohms damping resistors in discharge circuit of each capacitor block. The net generator inductance without a load was optimized to be as low as 15 nH, which results in extremely low impedance of the generator (approximately 0.08 ohms). It ensures effective energy coupling with a low impedance load such as Z pinch. The generator operates reliably without any adjustments in 70-100 kV range of charging voltage. Jitter in delay between output pulse and triggering pulse is less than 5 ns at 70-100 kV charging voltage. Operation and handling are very simple, because no oil or purified gases are required for the generator. The generator has dimensions 5.24x1.2x0.18 m(3) and total weight about 1400 kg, thus manifesting itself as simple, robust, and cost effective apparatus.
脉冲电流发生器是为进行载流脉冲等离子体实验而研制的。该发生器的主要部件包括电容器组、低电感电流驱动线路和中心负载部分。发生器由四个相同的部分组成，并联连接到一个负载上。电容器组由24个电容器模块（100 kV，80 nF）并联组装而成。在100 kV充电电压下，它存储9.6 kJ的能量。每个电容器模块都包含一个多间隙火花开关，该开关能够通过六个并联通道进行换向。开关在大气压下的干燥空气中运行。该发生器用感应负载和套筒负载进行了测试。在17.5 nH的感应负载和100 kV的充电电压下，每个电容器模块的放电电路中带有0.6欧姆的阻尼电阻时，它能提供650 kA的电流幅值，上升时间为390 ns。无负载时，发生器的净电感被优化至低至15 nH，这使得发生器的阻抗极低（约0.08欧姆）。它确保了与低阻抗负载（如Z箍缩）的有效能量耦合。在70 - 100 kV的充电电压范围内，发生器无需任何调整就能可靠运行。在70 - 100 kV充电电压下，输出脉冲与触发脉冲之间的延迟抖动小于5 ns。操作和维护非常简单，因为该发生器不需要油或净化气体。该发生器的尺寸为5.24x1.2x0.18 m³，总重量约1400 kg，因此是一种简单、坚固且经济高效的设备。
