| Budget Amount *help |
¥19,240,000 (Direct Cost: ¥14,800,000、Indirect Cost: ¥4,440,000)
Fiscal Year 2017: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2016: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2015: ¥9,620,000 (Direct Cost: ¥7,400,000、Indirect Cost: ¥2,220,000)
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| Outline of Final Research Achievements |
A criterion to stabilize the operation of a hollow cathode for high power electric propulsion of space crafts is obtained. First, we found that the hollow cathode operation is unstable when the propellant flow rate is low and the electron extract current is high. Second, we observed the plasma in the hollow cathode using probes. As a result, we found that the forcible electron collection causes the unsteady operation. Finally, we developed a new hollow cathode under the stabilization criteria and demonstrated that the hollow cathode operation became stabilized instantly.
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