| Electromagnetic implosion occupies a very important research position in the research field of high-energy physics experiment and weapon physics.In the case of ultrahigh power,fusion ignition can be achieved through rapid Z-pinch,resulting in ultra-high temperature and high pressure.Therefore,in recent years,universities and research institutes in various countries have taken plasma implosion technology as the key research direction.The relatively mature technology currently researched is the Z device,which uses a four-layer disk-conical magnetically insulated transmission line as the converging component of the pulsed power.Through multi-layer parallel transmission,the inductance of the transmission line can be effectively reduced,and a peak current of 26 MA has been obtained.However,the realization of this configuration adopts the "column-hole" structure,which will cause the magnetic field in some regions between the "column-hole" to be zero,so that there will be no magnetic insulation phenomenon in these magnetic zero regions,resulting in the loss of transmission current.At the same time,when the entire transmission line is required to be quickly replaced,this multi-layer parallel connection is difficult to satisfy.In response to these problems,the Institute of Fluid Physics,Chinese Academy of Engineering Physics proposed a new magnetically insulating current-collecting structure.The purpose of thesis is to carry out numerical simulation and optimization research on this new petal-shaped magnetically insulated transmission line,analyze the transmission characteristics of magnetically insulated transmission lines with different configurations,and carry out optimization.Specifically divided into the following aspects:Firstly,the complex model of the petal-shaped magnetically insulated transmission line is analyzed.The configuration consists of 12 periods similar to the petal shape,and each period can be regarded as composed of two basic transmission line configurations:parallel plate and coaxial arc.Therefore,thesis proposes a segmented theoretical calculation method,which analyzes each segment of the petal-shaped magnetically insulated transmission line separately,that is,the arc segment and the parallel plate segment are equivalent to the coaxial cylindrical and parallel plate configurations with definite formulas Magnetically insulated transmission lines to theoretically analyze the petal shape.Through three-dimensional numerical simulation,the dynamic transmission characteristics of these two basic configuration transmission lines are studied.Secondly,according to the analysis of the basic configuration above,the petalshaped cross-sectional structure is optimized,and a better structure is selected to realize a transmission line with low inductance.Then,the numerical simulation of the magnetically insulated transmission line with uniform petal-shaped cross-section is carried out,and the rationality of the design of the transmission line is demonstrated through theoretical analysis and simulation verification.When the transmission line with a load of 0.16 Ω achieves a peak transmission current of about 60 m A,the required driving voltage peak is 9.4 MV.Finally,the structure of the transition zone from the petal-shaped low-inductance magnetically insulated transmission line to the load is optimized,and the transmission characteristics of the optimized cold cavity and hot cavity in the transition zone are analyzed through simulation.Finally,when the load of the transmission line is an inductor with an inner radius of 3 cm and a height of 2 cm,the current peak value is 63.2 MA,and the required driving voltage peak value is 5.5 MV,which has high transmission efficiency. |
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