eration forces, measurement of drive shielding losses and possible coupling of drive forces into modes of oscillation. O'Neill also reported on the progress in work at Princeton University on the development of small scale early systems for the creation of industrial infrastructures on the moon. This work is being pursued by B.J. O'Leary and J. Driggers at Southern Research Inc. (Huntsville, AL) and coordinated efforts are being pursued by D.R. Criswell and R.D. Waldron at the Lunar and Planetary Institute. K.A. Ehricke (Space Global, La Jolla, CA) presented the paper, “Geolunar Industrial Transportation for Low Propellant Expenditure with New Energy Management Concepts for Lunar Access” (79-F-120). In this approach Ehricke proposes the creation of a smooth dust landing field on the moon which is several hundred meters wide and several hundred kilometers long. A spacecraft makes a tangential approach to the landing field from low lunar orbit and flies down the field just above the surface. The spacecraft scoops up lunar dust by means of expendable drag vanes which toss the dust outward and forward from the spacecraft. In this manner the momentum of the spacecraft is transferred to the lunar materials and the propellant expenditure on the spacecraft is only used for low thrust guidance maneuvers. The runway would be refurbished after every use. By supplying lunar derived propellants in low earth orbit, the cost of earth orbit to lunar surface transportation could be greatly reduced. G. Pignolet (Space Sciences Institute, St. Denis, France; “Retrieving Asteroids for Space Materials” (79-F-122)) and G.C. Hudson (Foundation Inc., St. Paul, MN; “Advanced Space Transportation Systems” (79-F-123)) considered the possibilities and implications for space industrialization for access to asteroidal materials. Due to schedule conflicts it was not possible for this reporter to attend the sessions on space law. It is suggested that interested parties contact the session chairmen, Dr. K.H. Bbckstiegel (Universitat Koln, FRG) for Session 12 and for Session 6, either Pierre Contensou (O.N.E.R.A, Chatillon, Contensou, Catherine, France) or Dr. Vladimir Kopal (Commission on Astronautics, Prague, CSSR). Three additional papers of relevance to space power should be mentioned. F. Drago, J. Hawley, H. Huang and G. Sechi (RCA, Princeton, NJ) presented “C-Band FET Power Amplifier for TWTA Replacement” (79-310). They described work in progress in testing a 6 W, 20% dc-rf efficient power transistor which could be used in space communications. Such devices might be of use in SPS power transmission with further improvements in efficiency. The topic of nuclear waste disposal in space is relevant not only from the viewpoint of alternative energy roles for space but also because several of the transportation and structural systems required are similar to those necessary for building an SPS from terrestrially supplied materials. H.O. Ruppe et al. (Technical University, Munich) presented the paper, “A Nuclear Waste Deposit in Space — The Ultimate Solution for Low-Cost and Safe Disposal” (79-A-15). R. Salkeld and R. Beichel (Aerojet Liquid Rocket Co., Sacramento, CA) presented “Nuclear Waste Disposal in Space — Implications of Advanced Space Technology” (79-IAF-51). The International Aeronautical Federation has an active subsection, the “Working Group on Space Energy and Power” which is focusing its efforts on power sources in space to provide energy to use in space and on earth. Two sessions of the working group were held in Munich on the 17th and 19th of September. Prof. P. Layton of Princeton University is the chairman. Researchers interested in details of the meeting should contact Prof. Layton (60 Penn-Lyle Road, Princeton Junction, NJ 08550). The working group is assisting in providing technical papers to the 1981
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