Large-scale parallel computing research on full three-dimensional PIC method based on difference equations. Electromagnetic particle-in-cell (PIC) simulation has been widely used in controlled thermonuclear fusion, space physics, free electron laser, high power microwave and the research of plasma. In this paper, basic algorithms and parallel algorithm used in the PIC simulation are studied respectively. And then a complete code implementation of the algorithms mentioned above, CHIPIC3D, is presented, which is written by the Fortran language to simulate the vacuum microwave source device. At last, several vacuum microwave source device simulation results acquired on the Milky Way high-performance platform are presented.

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