Study on Effect of Structure and Propellant on Beam of ECR Ion Source Wenbin Huang, Juan Yang, Haibo Meng, Xu Xia, Yuliang Fu and Zhan Hu JNWPU, 37 6 (2019) 1095-1101 Published online: 11 February 2020 DOI: 10.1051/jnwpu/20193761095