• Materials would be assembled at work stations and staging areas in low earth orbit (LEO), and the satellites would be constructed in geostationary orbit (GEO). • Some energy would be lost in each stage of energy conversion and transmission. That is, the solar array would not absorb all of the energy striking it, the transmitting antenna would not radiate all of the energy absorbed by the solar array, the ground receiving station would not receive all of the energy transmitted, and the receiving station would not collect all of the energy illuminating it. WORKSHOP ORGANIZATION During the process of organizing and conducting the workshop, three distinct kinds of documents were generated. All three bound together form the workshop proceedings. The first is the Workshop Briefing Document which was the basis for the discussions, invited contributions, and reports. This document was prepared by Battelle on the basis of the SPS Reference System Report and on calculations made to elucidate system features relevant to astronomy. The primary goal of the Briefing Document, like the Reference System Report, was to provide a set of consistent parameters for discussing SPS. A tabulation of the most important parameters used in the Briefing Document is shown in Table 1. The Briefing Document is by no means final, of course, since it is based almost entirely on the current Reference System. The second document is the report on topics that the workshop organizers felt would be important areas of discussion. These reports were prepared by the participants and were based on the characterization of the system as described in the Briefing Document.
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