photovoltaic technology is high conversion efficiency. To get a product to market required fast cycle time and a low development and qualification cost. One thing that aids low development cost the ability to directly replace existing cells in existing array designs, so that a new array design doesn't have to be developed. There is a good argument that development of radiation tolerant cell technology could open up a new range of intermediate orbits, with potentially high commercial value. This may be a strong argument for continued development of InP and other radiation tolerant cell designs. References [1] Space Photovoltaic Research and Technology 1994: Proceedings of a conference held at Lewis Research Center, Cleveland, OH, June 14-16, 1994 (to be published, National Aeronautics and Space Administration, 1994). [2] B. Smith, M. Gillanders, P. Vijayakumar, D. Lillington, H. Yang and R. Rolph (1991) "Production Status of GaAs/Ge Solar Cells and Panels," Space Photovoltaic Research and Technology 1991, NASA CP-3121, 9-1. [3] C.L. Chu, P.A. Iles, and W. Patterson, (1991) "Recent Advances in GaAs/Ge Solar Cells," Space Photovoltaic Research and Technology 1991, NASA CP-3121, 8-1. [4] G.A. Landis and A.F. Hepp, (1991) "Thin-Film Photovoltaics: Status and Applications to Space Power," Proc. European Space Power Conf, 2-6 Sept. 1991, Florence Italy, pub. ESA SP-320, 517-522. [5] R.L. Mueller and B.E. Anspaugh, (1992) "Results of Some Initial Space Qualification Testing on Triple Junction a-Si and CuInSe2 Thin Film Solar Cells," Proceedings of the XII Space Photovoltaic Research and Technology Conference, 108-117. [6] M.F. Piszczor and M.J. O'Neill, (1992) "Recent Developments in Refractive Concentrators for Space Photovoltaic Power Systems," Proceedings of the XII Space Photovoltaic Research and Technology Conference, 206-216. [7] J.M. Olson, S.R. Kurtz, A.E. Kibbler, K.A. Bertness, and D.J. Friedman, (1991) "GaInP2/GaAs Tandem Cells for Space Applications," Space Photovoltaic Research and Technology 1991, NASA CP-3121, 12-1. [8] S.G. Bailey and G.A. Landis, (1994) 1st World Conference on Photovoltaic Energy Conversion, Hawaii, December 1994. [9] P. deSelding, (1994) "Inmarsat Drops LEO Concept," Space News, and "Inmarsat Takes First Step to Privatization," Space News, May 16-22 1994, page 1. [10] Anonymous, (1994) "Study Claims LEO Market Can Support Four Systems," Space News, June 13-19, 1994.
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