Active protection against abnormal discharges in ion thruster grids based on staged voltage reduction. - Zhou, Sheng; Liu, Hao-Yan; Qi, Chang-Chun; Liu, Yue-Lin; Li, Wen-Rui; Li, Hua-Peng; Liu, Yue-Tong; Liu, Yan-Qi; Zhang, Guan-Jun (AIP Advances, 2025)