A Novel Domian Decomposition Simulator for the Transmission Analysis of Travelling-wave Tube

The input/output system is one of the key component of travelling-wave tubes and affects the bandwidth and power capacity of the whole tube significantly. The widely used windows simulator component of MTSS for TWT's input/output system is based on finite element method. It might be inefficient when the multiscale feature of a complex input/output system leads to large numbers of mesh for accuracy. So that the matrix equation need to be solved become millions of order, which results in lots of computation resources consuming. In this work, a novel domian decomposition simulator for the transmission analysis of the TWT's input/output system is proposed. By transfer a large matrix equation solution problem into a series of smaller problems, the new simulator needs far less memory and CPU time than the one based finite element method during the simulation process. The results shows that the new simulator is more efficient than the old one under a comparable computational accuracy.