Simulating Proton Transmission Through Thin Radiation Shields for Space Based Solar Power

We present an open-source code for calculating proton damage to solar cells through thin radiation shields with relevance to space based solar power delivered from geostationary orbit. In contrast to EQFLUX, we use Monte-Carlo calculations for proton transmission instead of analytic range formula. In contrast to MC-SCREAM, we use experimental relative damage coefficients instead of theoretical non-ionizing energy loss function. We demonstrate the numerical convergence of our results and we predict that 30 g/m<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> of silica or 20g/m<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> of polyethylene is sufficient to grant InP solar cells 80% end-of-life remaining power after 15 years in geostationary orbit.