RECEPTOR SITING CRITERIA Laser receptor siting criteria are far less restrictive than their microwave rectenna counterparts, due primarily to the smaller land area requirements. Estimates (2) predict a necessary land area of only a few square kilometers, roughly two orders of magnitude smaller than necessary for the microwave rectenna. In addition, siting criteria are less restrictive in terms of topological acceptability, permitting siting in closer proximity to load centers and/or existing power transmission lines. Many of the exclusion areas for receptor siting as listed in Table 1 are identical to those involved in microwave-rectenna siting. Because of the proposed power density for laser transmission (~ 1-100 W/cm2), however, it is unlikely that any site will be subject to multiple land use. Because the purpose of this research is to bound cogent power-availability parameters for the various regions of the United States and to develop mitigation techniques and siting criteria which will diminish the deleterious effects of inclimate weather, detailed land tract evaluations were not performed. Furthermore, siting criteria based on projected electrical power demand are beyond the scope of this study, and no attempt was made to identify planned transmission line additions or to project future expansion of any grid. Since detailed statistical meteorological data are required by the power availability model, the sites selected are identified by their associated weather station. If the actual site tract is in close proximity to the weather station, the assumption of identical statistics is usually good for most mid-latitude climates. For our purposes, sites were chosen which were within 100 miles of an existing extra-high-voltage (EHV) transmission line, consistent with the exclusion areas listed in Table 1. No
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