| Budget Amount *help |
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Outline of Final Research Achievements |
A radio frequency (RF) plasma cathode with an external magnetic field have been researched as an electron source to remove the drawbacks with dispenser hollow cathodes from ion and Hall thrusters. We evaluate the electron-emission performance of the RF plasma cathode and the operating characteristics of the combination of a 1-kW class Hall thruster and the RF plasma cathode. The effect of the external magnetic field on the emission electron current is small. Based on this result, the high density plasma produced by helicon waves was not confirmed in the operating range of RF power from 20 W to 100 W. The anode efficiency of the RF plasma cathode is comparable to that of a hollow cathode. However, because of the high RF power consumption, the total efficiency of the RF plasma cathode is lower than that of the hollow cathode at higher anode mass flow rate. This result indicated that for space-related applications, it is important to reduce the power consumption of RF plasma cathode.
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