Recent developments on EOS 2D/3D electron gun and collector modeling code

The advances to EOS is introduced. In EOS 2D, the Gauss-Legendre integral formula is newly adopted to improve the electric field calculation accuracy. The self- magnetic field calculation technique is used for modeling high-current relativistic electron beam. The adaptive mesh technique has been employed to obtain specified accuracy automatically. The multi-frontal incomplete cholesky conjugate gradient method has been applied to reduce computation time and save computer memory consumption.