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为有效利用从P70霍尔推力器放电通道进入缓冲腔的快电子能量,考虑两个磁场特征以提高缓冲腔预电离率。一是提高磁感应强度,二是缓冲腔内从气体分配器到放电通道方向的负梯度。采用FEMM有限元磁场计算软件,在不改变推力器电离和加速通道内优化磁场特征的前提下,设计的新型缓冲腔磁路满足上述磁场特征。放电实验结果表明,在新型缓冲腔磁路下放电电流低频振荡幅值更小。新型磁路有助于延长推力器寿命,有助于电离和加速通道内电离与加速区的分离。
To exploit the fast electron energy entering the buffer chamber from the P70 Hall thruster discharge channel, two magnetic field characteristics are considered to increase the buffer pre-ionization rate. One is to increase the magnetic flux density, the other is to buffer the negative gradient from the gas distributor to the discharge channel. The FEMM finite element magnetic field calculation software is used to design the new type of buffer cavity magnetic circuit to meet the above magnetic field characteristics without changing the characteristics of the magnetic field in the ionization and acceleration channels of the thruster. Discharge test results show that the discharge current in the new buffer cavity low frequency oscillation amplitude is smaller. The new magnetic circuit helps to extend the life of the thruster and helps to separate the ionization from the acceleration zone in the ionization and acceleration channels.