Bootstrap Surface Charging at GEO: Modeling and On-Orbit Observations From the DSCS-III B7 Satellite
| Autor: | L.H. Krause, Gabriel Font, Matthew G. McHarg, S.T. Lai, D.L. Cooke, V. Putz, C. L. Enloe |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Physics
Nuclear and High Energy Physics Spacecraft business.industry Geosynchronous orbit Secondary electrons Kapton Computational physics Spacecraft charging Nuclear Energy and Engineering Secondary emission Physics::Space Physics Orbit (dynamics) Satellite Electrical and Electronic Engineering Aerospace engineering business |
| Zdroj: | IEEE Transactions on Nuclear Science. 54:1997-2003 |
| ISSN: | 0018-9499 |
| DOI: | 10.1109/tns.2007.909911 |
| Popis: | We present an analysis of the charging interactivity between surrounding surface materials aboard a spacecraft at geosynchronous altitudes. In particular, bootstrap charging of a small surface may occur if is surrounded by a large negatively charged surface. Here, a negative potential barrier forms above the small surface, resulting in suppression of photo- and secondary electron emission from that surface. Additionally, the small surface experiences an enhancement of the collection of the photo- and secondary electrons emitted from the surrounding surface. This mechanism results in the charging of the small surface to higher levels than that of the patch in isolation, and in many cases the final potential will reach that of the potential of the larger surrounding surface. With this study we examine bootstrap charging behavior with model data and with data collected on orbit. We have modeled the DSCS-III B7 geosynchronous satellite with realistic geometry and spacecraft materials. Additionally, a previous study has shown that bootstrap charging has been observed on the DSCS-III B7 geosynchronous spacecraft. Both Astroquartz and Kapton cloth patches charged up to the frame potential of the satellite during periods of severe frame charging. The results of modeling bootstrap charging of a small Kapton patch floating relative to the DSCS-III frame fixed at a potential of -1,000 V show that the patch will indeed charge up negatively to match the frame potential, with the temporal increase in negative potential following an exponential time characteristic. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|