A novel and accurate TDFIT-PIC code for the multipactor simulations

The multipactor avalanche is caused by the interaction between the electromagnetic field and the free charged particles in the vacuum or close-to-vacuum condition. Because of the complicated interaction, it´s impossible to analyze multipactor using analytical methods. Although experimental investigations are accurate, it´s known for inefficient and expensive. With the development of computational methods, the computer-aided technology becomes an economical and efficient way for the multipactor analysis. Currently, the FDTD-PIC method, which is a self-consistent approach to solve the Maxwell´s equations and the Newton-Lorentz´s equations, has become the most popular method in multipactor simulations. However, the precision of traditional FDTD-PIC method is degraded by the staircase error, and it is particularly serious when the object has curved boundaries. In past researches, with the development of conformal technique in FDTD method^1,2,3, our group has proposed a conformal TDFIT-PIC method⁴ to eliminate the staircase error and improve the computational precision. Recently, our group develops a novel and accurate TDFIT-PIC code, which implements a conformal mesh solver, a conformal TDFIT-PIC calculator and a versatile visual tool in an integrated platform. Compared with the conventional FDTD-PIC code, many experimental results have validated that higher accuracy for the multipactor simulations can be achieved by our novel.