COMPUTER PARTICLE SIMULATION OF HIGH-VOLTAGE SOLAR-ARRAY ARCING ONSET

The operation of a high-voltage solar army in low Earth orbit may cause arcing on the negatively biased parts of a solar array. This sets a practical limit on the operational voltage of solar arrays. This paper is the extension of three earlier works1-3 regarding high-voltage solar array arcing. The onset of arcing is reproduced by self-consistent computer simulations to verify the arcing onset model developed in the earlier work. It is shown that neutral gas is desorbed from the dielectric surface forming a localized neutral cloud over the surface, and the arcing onset occurs as the gas breakdown at a parameter pd (pressure times distance) much smaller than the Paschen minimum. Analytical expressions for the prebreakdown electron currents and the neutral densities are also derived and used to obtain a parametric formula of the breakdown condition. Arcing rates are calculated including the breakdown condition of the desorbed neutral gas. The theory is compared to the Japanese Space Flyer Unit High-Voltage Solar Army ground experiment and shown to give a reasonable explanation for data relating the arcing mte to the solar array temperature.