Multipactor breakdown modelling using an averaged version of Furman´s SEY model

Summary form only given. The formation of multipactor is strongly dependent upon the secondary electron yield (SEY) of a surface, and the emission velocities of the emitted electrons. Furman and Pivi proposed a SEY model1 that is frequently used and is considered to be quite accurate, but this model is based around a stochastic scattering process, which necessitates computationally costly Monte-Carlo simulations in order to simulate the formation of multipactor in a given system. In our previous work2,3. we presented an approximation to Furman´s model, in which for a given particle impact velocity, a single weighted particle is emitted, thus avoiding Monte Carlo simulations to model multipactor current; this particle was chosen to be simply the median of the underlying scattering distribution. In this present work, we generalize the previous approximation to Furman´s fully stochastic model by examining other emission energy statistics to represent the underlying stochastic scattering behavior. We then provide error metrics for evaluating these approximations, and suggest how a suitable simplification to Furman´s model may be chosen to best model the initiation of multipactor. The results were obtained through simulations in a coaxial geometry, but are expected to be generalizable to other geometries.