研究目的
To demonstrate the operation and durability of a carbon nanotube-based field emission cathode (FEC) in low Earth orbit (LEO) for potential use in space debris removal systems with electrodynamic tether (EDT) propulsion.
研究成果
The FEC operated well during the one-week mission, demonstrating high electron emission capability and reasonable durability in LEO. The results suggest the feasibility of using the FEC in space, particularly for debris removal missions, although further research is needed to address durability concerns related to atomic oxygen exposure.
研究不足
The experiment faced challenges such as the unsuccessful deployment of the tether due to a malfunction of the end-mass holding mechanism. Additionally, the direct impact of atomic oxygen (AO) with the orbital velocity was found to be critical to the CNT emitter, indicating potential durability issues in certain conditions.
1：Experimental Design and Method Selection:
The experiment involved the installation and operation of eight FECs on the Japanese cargo spacecraft Kounotori-6 (HTV-6) as part of the Kounotori Integrated Tether Experiment (KITE). The FECs were designed to emit electrons into space plasma, with their performance and durability monitored over a one-week mission period.
2：Sample Selection and Data Sources:
The FECs used multi-walled carbon nanotubes made by an arc discharge process as the emitter material. Data on electron emission capability and durability were collected during the mission.
3：List of Experimental Equipment and Materials:
The FEC module included a protective shield and a power control unit. The FECs themselves featured a mask electrode made of thin molybdenum to reduce electron beam flow to the gate electrode.
4：Experimental Procedures and Operational Workflow:
The FECs were operated under various conditions, including measurements of current-voltage characteristics and autonomous successive operation of all eight FECs. The FECs were exposed to the LEO environment for about 130 hours, with total operation time reaching about 50 hours.
5：Data Analysis Methods:
The performance of the FECs was analyzed based on electron extraction efficiency and durability, with comparisons made to ground test results.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
