modules for space stations and lunar/planetary bases. [34] Therefore, the Powersat demonstrator provides a rare test-bed opportunity to understand the behaviour and performance of inflatable structures while meeting the needs of the Powersat mission. Reflector Discussion Many of the more recent concepts for Powersats and SPS require the use of inflatable, space-rig idising reflectors to enable large collector areas for a low launch mass. One example is that proposed by Arsat for a 50 m diameter inflatable, space-rigidising reflector for experiments in space-to-ground power beaming. (Figure 5.1-11) [35] Likewise, the initial Powersat demonstrator would benefit considerably from their use, as noted in 5.1.2, as the transmission distance is a function of the product of the reflector and rectenna diameters. Oerlikon-Contraves has been the leader in this field for many years and has built a number of test articles. In particular, the first development model, designated LOAD-3, (Figure 5.1-12.) was built and tests indicated that its surface accuracy was less than 1 mm (root mean squared) from the ideal surface after rigidisation.[36] This reflector would be almost ideally suited for the Powersat demonstrator. Oerlikon-Contraves had hoped to use a 5 m diameter reflector for the mobile communications pay load on the Artemis comsat However, uncertainties over the performance of inflatable reflectors - borne largely out of the fact that no inflatable reflector has yet flown in space - led to the cancellation of this project and Oerlikon-Contraves’ withdrawal from inflatable reflector technology. The initial Powersat demonstrator would provide a unique opportunity as a test-bed for inflatable reflectors, not just for future Powersat and SPS applications, but also for future communications and other satellite applications. Its use would also provide a much more demonstrative Powersat experiment by
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