Arc Rate Simulation and Flight Data Analysis for the PASP Plus Experiment.
Final rept. 6 Apr 92-1 Sep 95,
MASSACHUSETTS INST OF TECH CAMBRIDGE SPACE PROPULSION LAB
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As power demands continue to increase, spacecraft power systems are being designed to operate at higher voltages. When operating at high negative voltages, however, arcing may occur on the solar cells. In this work, a model of the arcing process developed by Cho and Hastings was refined to be more physically accurate and to better simulate experiment operations. The modified computer simulation was then used to predict the arcing rates on the PASP Plus solar cells. Both the pre-flight and post-flight simulations showed good agreement with the flight data. The flight data was then analyzed to examine corelations between arc rates and the various material, environmental, and operational parameters. Arcing levels were found to depend strongly on the bias voltages, with the scalings suggested by the model proving to accurately relate the arcing rates on the dilferent modules. Cell temperature and ion flux were also found to be important parameters. As expected, a critical temperature above which no arcing occurs was found to exist. Solar array arcing, High voltage solar arrays, PASP Plus, Wrap-through-contact solar cells.
- Electric Power Production and Distribution