The Study On Numerical Simulation Of Long Magnetic Insulated Transmission Line Transmission Process

In recent years, with the quick development of the high pulsed power technology in the application of the civil and military and high technology, Z-pinch device have been studied in many developed countries. Magnetically insulated transmission line(MITL) is the most important part of Z-pinch device, so the design and theoretical research of MITL are the keys of the core technology. Because of the complicated structure and the high cost, simulation for MITL is general required before practical experiment. This paper is based on CHIPIC particle simulation software platform to simulate the magnetic insulated transmission line, not only the theoretical of MITL have been studied, but also the design have been discussed. And then the single pulse power vacuum devise is simulated by CHIPIC which provides powerful guarantee for its practical experiments. Concrete is divided into the following content:Firstly, the basic theory of MITL is studied. The steady-state theory and non-steady-state theory are compared, the same structure is simulated by MAGIC and CHIPIC at the same time, so that the CHIPIC can be used for the simulation of the magnetic insulation coaxial transmission line.Secondly, the centered-difference, time-biased and FDTD algorithms in particle-in-cell(PIC) simulation are been used for the same structure. Different grid-marking methods in the PIC simulation are carried out to find out the effect of different grid-marking.Thirdly, the key points of how to design the coaxial MITL is studied. The appropriate load diode pole spacing between cathode and anode, the proper distance of cathode and anode, and the impedance matching are discussed.Finally, the single-channel pulsed-power vacuum device is studied. Based on the platform of CHIPIC, the limitation of memory and computation speed on a single computer is broken with the method of parallel computation of multi-computers. For the model of the whole device, the models of the parts of the feed-in, convergence and transmission of the single-channel pulsed-power are built, and the parameters are set up, not only for the 1 meter long transmission period, but also for the 12 meters one. The voltage between the cathode and anode, the current of the cathode and the anode of the result are in accordance with the theories. The single-channel pulsed-power vacuum device can retain magnetically insulated and achieve the function of convergence of power. This result shows the feasibility of the single-channel pulsed-power vacuum device.