Design and experimental optimization of a 5 cm-diameter electron cyclotron resonance (ECR) Ion Thruster was carried out. The experimental results with the shorten discharge chamber demonstrated that its maximum efficiency, specific impulse, and thrust were 38%, 4300 s, 2.3 mN with the power of 130 W, respectively. The beam current was increased with the increment of the propellant flow rate and screen grid voltage. In addition, the performance of the thruster was associated with the distance of the antenna and screen grid. However, the optimum distance depended on the input microwave power which was about 20 W.
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