Improvement on the Scaling Theory of the Stationary Plasma Thruster

Abstract

The scaling theory of the stationary plasma thruster provides a basis for the design of thrusters. We first briefly discusses the disadvantages of the existing scaling theory, and then we improve it by introducing a scaling index variable. If the scaling index variable is properly set, the thruster performance prediction is much improved, and the model can be used to identify areas for design improvement. For example, for lower powers the probability of magnetic saturation can be reduced, and ion sputtering can be alleviated; for higher powers the power-to-weight ratio and thrust-to-weight ratio can be improved.