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Fast computation of threshold of multipaction discharge in ferrite circulator

The ferrite circulator is a kind of microwave devices which is complex-shaped and composed of both metal and dielectrics. It is time-consuming to compute the accurate threshold of multipaction discharge in ferrite circulators with particle-in-cell simulation or Monte Carlo simulation. A fast computation method is presented here. Because the self-consistent field of the electrons could be ignored during the preliminary stage of the multipaction discharge, only the applied field of the input microwave have to be computed. In consideration of periodicity, a frequency domain (FD) distribution of the field is computed by a commercial 3D FD solver1 firstly. Then the results is imported to multipaction discharge simulation. Hence the field at any time and any position could be computed from the imported data simply and accurately. Finally a Monte Carlo method is introduced to simulate the multipaction discharge in which the simulated number of electrons is limited and a large time-step method is used to compute the electron motion. In order to computed the electrostatic field of the accumulate charges on the surface of ferrite, a local homogenization method is proposed to compute it efficiently. A typical ferrite circulator was simulated for example, and the computation efficiency was compared with particle-incell method2.