Fast Calculation of Coil Launcher Based on Current Filament Method

High-speed coil launcher with a large number of coils is hard to calculate and is time-consuming. To realize the design and optimization of high-speed coil launcher, this article studies the simulation method of multistage coil launcher. At present, the calculation methods of multistage coil launcher mainly include the finite-element method (FEM) and the current filament method (CFM). The CFM converts the launcher system into a circuit model and its computational efficiency is much higher than that of FEM. In this article, based on CFM of the coil launcher, combined with the structural characteristics of the coil launcher and the electromagnetic field theory, an inductance calculation method and an iterative algorithm suitable for the CFM are proposed. The proposed inductance calculation method can reduce redundant calculations. The decomposition of induction matrix is used to speed up the solving efficiency of the differential equations. Taking the 40-stage coil launcher as an example, the improved calculation method takes only about 63 s to complete, and the calculation efficiency is much higher than that of the FEM, which needs 58 612 s (about 16 h) to get results.