[1] [1] Marques R I, Gabriel S B. Dual stage four grid (DS4G) ion engine for very high velocity change missions［C］. 31st International Electric Propulsion Conference, University of Michigan, Ann Arbor, USA, 2009.

[2] [2] Bramanti C, Izzo D, Samaraee T, et al. Very high delta-V missions to the edge of the solar system and beyond enabled by the dual-stage 4-grid ion thruster concept［J］. Acta Astronautica, 2009, 64(7-8): 735-744.

[3] [3] Walker R, Izzo D, Fearn D. Missions to the edge of the solar system using a new advanced dual-stage gridded ion thruster with very high specific impulse［C］. Proceedings of the International Symposium on Space Technology and Science, 2006, 25: 1106.

[4] [4] Fearn D G. The application of gridded ion thrusters to high thrust, high specific impulse nuclear-electric missions［J］. Journal of the British Interplanetary Society, 2005, 27(1): 257-267.

[5] [5] Lapointe M, Mikellides P. High power MPD thruster development at the NASA Glenn research center［J］. Journal of Pediatric Oncology Nursing, 2013, 14(2): 121.

[6] [6] Longmier B W, Glover T W, Díaz F R C, et al. VASIMRVX-200: High power electric propulsion for space transportation beyond LEO［C］. AIAA SPACE 2009 Conference & Exposition, 2009.

[7] [7] Walker R, Bramanti C, Sutherland O, et al. Initial experiments on a dual-stage 4-grid ion thruster for very high specific impulse and power［C］. 42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2006: 4669.

[8] [8] Bramanti C, Walker R, Sutherland O, et al. The innovative dual-stage 4-grid ion thruster concept-theory and first experimental results［C］. Fifty-Seventh International Astronautical Congress, 2006: 4.

[9] [9] Fearn D G. The use of ion thrusters for orbit raising［J］. Journal of the British Interplanetary Society, 1978, 33(33): 129-137.

[10] [10] Bramanti C, Fearn D. The design and operation of beam diagnostics for the dual stage 4-grid ion thruster［C］. 30th International Electric Propulsion Conference, Florence, Italy September, 2007: 17-20.

[11] [11] Coletti M, Gabriel S. Dual stage ion optics, a parametric study［C］. 42nd AIAA Plasmadynamics and Lasers Conference in conjunction with the 18th International Conference on MHD Energy Conversion (ICMHD), 2011: 3741.

[12] [12] Coletti M, Gabriel S. Dual Stage Ion Optics, a Parametric Study on Performances and Lifetime［C］. 47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2011: 5735.