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title静止軌道衛星用太陽電池アレイの放電プラズマの分光測定
Other TitleOptical spectrum measurement of arc plasma on solar array for GEO satellite
Author(jpn)志方 吉夫; 三丸 雄也; 川崎 崇; Kim, Jeongho; 細田 聡史; Cho, Mengu
Author(eng)Shikata, Yoshio; Sanmaru, Yuya; Kawasaki, Takashi; Kim, Jeongho; Hosoda, Satoshi; Cho, Mengu
Author Affiliation(jpn)九州工業大学 工学部 電気工学科; 九州工業大学 工学部 電気工学科; 九州工業大学 工学部 電気工学科; 九州工業大学 工学部 電気工学科; 九州工業大学 工学部 電気工学科; 九州工業大学 工学部 電気工学科
Author Affiliation(eng)Kyushu Institute of Technology Department of Electrical Engineering, Faculty of Engineering; Kyushu Institute of Technology Department of Electrical Engineering, Faculty of Engineering; Kyushu Institute of Technology Department of Electrical Engineering, Faculty of Engineering; Kyushu Institute of Technology Department of Electrical Engineering, Faculty of Engineering; Kyushu Institute of Technology Department of Electrical Engineering, Faculty of Engineering; Kyushu Institute of Technology Department of Electrical Engineering, Faculty of Engineering
Issue Date2005-06
PublisherInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)
宇宙航空研究開発機構宇宙科学研究本部
Publication title第24回宇宙エネルギーシンポジウム 平成16年度
The Twenty-fourth Space Energy Symposium March 7, 2005
Start page72
End page76
Publication date2005-06
Languagejpn
AbstractAs the power level of Geostationary satellites increases, discharge phenomena on solar array are becoming serious threat to safe operation. There is more demand of international standard on ground test conditions (test environment, test circuit, test duration and external capacitance). Especially, the value of external capacitance that feeds energy to the trigger arc is very important. The external capacitance corresponds to the absorbed electric charges on the insulator surface. A low capacitance value does not provide a sufficient current to trigger a secondary arc. On the other hand, we must avoid using an excessive value of capacitance that leads to degradation of cell electrical power output. The amount of external capacitor currently employed differs among research institutions. We focused on the relation between the electrical conductivity of the trigger arc plasma and the amount of external capacitor in order to evaluate the range of proper amount of external capacitor. Electrical conductivity is strongly related to plasma temperature. Thus, we measure the plasma temperature by the emission spectroscopy. A sample coupon has 12 cells with typical size coverglass (7 cm x 3.5 cm x 100 micrometer). All the tests were carried out under the condition of inverted gradient, which coupon was biased negatively and irradiated the electron beam. In trigger arc (pulse width: below 10 microsecond) spectra, identified spectra were hydrogen, Carbon molecular. In secondary arc spectra (pulse width: 10 microsecond to 100 microsecond), identified spectra were hydrogen, Carbon molecular, aluminum and iron. There were clear difference between trigger arc spectra and secondary arc spectra. Especially, C2 swan band was measured clearly from arc initiation to extinction with good repeatability. Thus, temperature was deduced by relative intensity of each blanch of C2 swan band. The arc temperatures became low after discharge shifts to the secondary arc.
Keywordssolar array; electric discharge; stationary orbit; short circuit; blowoff current; discharge plasma; electrical conductivity; plasma temperature; optical emission spectrum; molecular spectroscopy; spacecraft charging; 太陽電池アレイ; 放電; 静止軌道; 短絡; ブローオフ電流; 放電プラズマ; 電気伝導度; プラズマ温度; 発光スペクトル; 分子分光; 宇宙機帯電
Document TypeConference Paper
JAXA Categoryシンポジウム・研究会
SHI-NOAA0049120015
URIhttps://repository.exst.jaxa.jp/dspace/handle/a-is/50969


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