| Project/Area Number |
04650060
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Aerospace engineering
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| Research Institution | Institute of Space and Astronautical Science |
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Principal Investigator |
SASAKI Susumu Institute of Space and Astronautical Science Space Power Systems Associate Professor, 衛星応用工学研究系, 助教授 (00092221)
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| Project Period (FY) |
1992 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1994: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1993: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1992: ¥800,000 (Direct Cost: ¥800,000)
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| Keywords | Solar Power Satellite / Ion Bombardment / Degradation / Energetic Oxygen Ions / Power Loss / Mass Loss / Pollusion Rate / Sputtering Effect / 酸素イオンビーム / アルミ蒸着ポリイミド / アーク放電 / スパッタリング / 電磁環境 / 高電圧衛星 / 太陽発電衛星 / 質量欠損 |
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| Research Abstract |
Spacecraft with high power utilities, such as the Solar Power Satellite, will use a high voltage in the power system. Exposure of a high voltage more than 100 V in space plasma causes ion bombardment to the negative side, resulting in an enhanced power loss, material degradation and pollusion in its vicinity. We have made an experiment on the sputtering effect of energetic oxygen ions of 7.1x10^<13> ions/cm^2・sec irradiated onto alluminized polymide. The irradiation rate is approximately 1000 times larger than that on an satellite at the height of 500 km. The mass loss rate of the alluminum layr is estimated by measuring its optical transmittance. The secondary ions generated at the alluminum surface are detected by an ion mass spectrometer. The energy distribution of the secondary ions are measured by a Faraday cup. For 1 keV oxygen ions, the sputtering rate has been found to be typically 0.8 to 1.0 at 1000 eV.The production rate of the secondary ions is 0.02-0.04% and their energy ranges from 30 to 40 eV.These results have been used to estimate power loss, mass loss and pollusion rate for a satellite exposing a high voltage in the ionosphere. In case of a sphere with 1 m diameter biased at -1000 V located at the height of 500 km, alluminum surface will be degraded by 16mum each year while the vicinity will be contaminated by the secondary ions to be accumulated up to 30* per year. The power loss is calculated as 5 watt for this case.
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