Authors: Dong-Yeop Na, Indranil Nayak and Fernando L. Teixeira
Source: FERMAT, Volume 35, Communication 3, Sep.-Oct., 2019
Abstract: We present an accurate and efficient charge conserving electromagnetic particle-in-cell (EM-PIC) algorithm based on unstructured grids for the analysis of multipaction in coaxial cables. The present 2.5-D axisymmetric EM-PIC algorithm discretizes Maxwell-Vlasov equations and integrates the Furman-Pivi probabilistic model to take into account the secondary electron emission process. We adopt a local and explicit update for the Maxwell solver based on a finite-element time domain (FETD) scheme. The EM-PIC algorithm ensures charge conservation on unstructured grids from first principles by using Whitney forms. The present algorithm is used to investigate single- and double-sided multipactor effects in coaxial cables following multipaction susceptibility charts. In addition, we study surface treatments such as surface corrugations as possible multipaction mitigation strategies. This study is enabled by the use of unstructured grids that make it possible to capture fine geometric structures while preserving charge conservation.
Index Terms: Numerical analysis, coaxial cables, Particle-in-Cell Algorithm
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Numerical Analysis on Multipactor Effects in Coaxial Cables via Particle-in-Cell Algorithm