polar orbit, ALOS, solar paddle, spacecraft power supply, satellite design, large space structure, aerospace environment, spacecraft charging, Advanced Land Observing Satellite, scientific satellite
Japan Aerospace Exploration Agency
Japan Aerospace Exploration Agency
NEC TOSHIBA Space Systems Ltd.
Kyushu Institute of Technology
Kyushu Institute of Technology
出版者
宇宙航空研究開発機構
出版者（英）
Japan Aerospace Exploration Agency (JAXA)
雑誌名
宇宙航空研究開発機構特別資料
雑誌名(英)
JAXA Special Publication: 9th Spacecraft Charging Technology Conference
巻
JAXA-SP-05-001E
ページ
840 - 856
発行年
2005-08-01
抄録（英）
A large solar array paddle with the power generation of 7 kW was developed for the Advanced Land Observing Satellite (ALOS). With the deployed dimension of 22 x 3 m in a polar orbit, this 9-panel rigid paddle has insulator Silver-Teflon thermal sheets and exposed bypath diode boards on its back face, and cover-glass integrated silicon solar cells on its front face. A charging analysis suggested that large negative potentials on the dielectric back-surfaces and at satellite ground may be induced through the ALOS's auroral passage in off-nominal conditions. The ALOS's baseline panel design was tested for the electron beam radiation and the plasma interaction, which simulated charging situations near the poles. Both the back face and the front face were tested, and arc thresholds were identified. Possibility of sustained arc and surge voltage, as well as survivability against estimated accumulation of arcs, were investigated. The back face showed small negative arc thresholds for both the insulator surface potential and the spacecraft ground voltage. Surface flashover was observed over the silver-Teflon coating. Although both the back and front faces demonstrated immunity against sustained arcs, design modifications to mitigate the back face's susceptibility for charging and arcing were experimentally examined and implemented. The conductive adhesive that surrounded the baseline Silver-Teflon sheet and covered the CFRP face-sheets eliminated arcs at the silver-Teflon edges and the face-sheet. The Kapton film shielding the diode board protected the exposed power line from arcs.
Solar array paddle for the Advanced Land Observing Satellite (ALOS): Charging mitigation and verification
49206097.pdf
(8.95MB)
