A numerical coupling method for particle tracking in electromagnetic fields Heng Jing, Xiaoqing Yang, Shiyue Wu, Man Zhang, Jie Zhou, Jianping Yuan, Zhanxia Zhu and Kama Huang Eur. Phys. J. E, 42 4 (2019) 48 Published online: 18 April 2019 DOI: 10.1140/epje/i2019-11810-3