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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Boca, A. Blumenfeld, P. Crist, K. De Zetter, K. Richards, B. Sarver, C. Sharps, P. Stall, R. Stan, M. |
| Copyright Year | 2013 |
| Description | Author affiliation: Emcore Photovoltaics, Albuquerque, NM, USA (Boca, A.; Blumenfeld, P.; Crist, K.; De Zetter, K.; Richards, B.; Sarver, C.; Sharps, P.; Stall, R.; Stan, M.) |
| Abstract | NASA's Solar Probe Plus (SPP) will travel closer to the Sun than any previous spacecraft. During its 7-year, 24-orbit mission, SPP will make scientific measurements of the solar corona, reaching minimum perihelion at ~9.5 solar radii $(R_{s})$ from the center of the Sun. The solar array wings powering the spacecraft will operate under wide-ranging temperature and irradiance conditions, of 0 to 27×AM0 and -70 to +160°C nominally, with transient off-nominal survivability required up to 80×AM0. Over the mission duration, portions of the array may accumulate a total of over 200,000 sun hours. To properly size the array, its performance must be quantified through end-of-life, with the greatest uncertainty coming from our understanding of UV-induced degradation at high irradiance and high temperature (HIHT). The array's short-term ability to function with no measurable degradation at the peak irradiances expected at 9.5 $R_{s}$ has already been demonstrated with adequate margin on small-scale but otherwise flight-like test articles. However over 90% of the mission time will be spent by the array operating at relatively more moderate irradiances at or below 10×AM0. This paper gives an overview of results from two SPP-specific HIHT UV-exposure experiments we have performed at ~10×AM0, over durations of ~1000 hours each. The first experiment was performed in the facilities of the Boeing Radiation Effects Laboratory in Kent, WA, and it focused on the dependence of UV-induced array performance degradation on the choice of materials used in fabricating the coverglass-interconnect-cell (CIC) assemblies, at a fixed temperature of ~180°C. The second experiment was performed in the facilities of the JAXA Inner Planetary test laboratory in Sagamihara, Japan, and its focus was on measuring the temperature dependence of UV-induced array performance degradation between 120 and 240°C. |
| Sponsorship | IEEE Electron Devices Soc. |
| Starting Page | 3115 |
| Ending Page | 3120 |
| File Size | 915122 |
| Page Count | 6 |
| File Format | |
| DOI | 10.1109/PVSC.2013.6745119 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2013-06-16 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Arrays Degradation Temperature measurement Sun Extraterrestrial measurements Substrates Temperature distribution aerospace testing performance evaluation photovoltaic systems space technology |
| Content Type | Text |
| Resource Type | Article |
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