Influence of the Decelerator Grid on the Optical Performance of the Ion Thruster

Table 5

Average erosion rate of 2-grid and 3-grid optical systems (unit: m/1000 h).

Density	Barrel erosion rate (by CEX ions)			Pit and Groove erosion rate(by CEX ions)
	2-grid	3-grid	Reduction (%)	2-grid	3-grid	Reduction (%)
0.075			-61.36			97.70
0.2			-52.72			98.34
0.75			-21.45			94.37
2.0			0.00			93.92