Beam transmission characteristics simulation of EAST-NBI magnetic deflection system

According to the working principle of EAST-NBI deflection system, the basic transmission process of the beam and characteristics of the deflection system were analyzed. Using Monte Carlo method, computer programs were developed to simulate the transmission of the neutral beam in the deflecting region. The results show EAST-NBI magnetic deflection system can strip the residual ions out of the beam passage; The loss of reionization in the beam deflection region is about 2.43%; Because of line focusing process caused by the 180 degrees deflection of the beam, the pole shields of the deflection magnet have high heat flux density.