c. Power source and slip rings to be sectored into a minimum of eight independent units to permit a practical switchgear design by limiting maximum short circuit current. d. Cost and weight can be scaled by the square root of input power for system tradeoff studies. e. Magnetic interaction effects are negligible in attitude control system design. For the amplitron: f. Constant current regulation at the converter to maximize power output and minimize phase shift variations with voltage changes. g. Cascade configuration because of low gain characteristic. h. Power source voltage should be. For the klystron: i. Unregulated operation to maximize power output. j. Parallel operation to minimize failure effects and simplify compensation for phase shift variations with voltage changes. k. Power source voltage should be 40 kVdc. SECTION 5 - REFERENCES (1) "The Solar Photovoltaic Array, Preliminary Technical Report," Spectro Lab, Division of Textron Inc. , Sylmar, California. (2) "Rapid Recycle Crowbar Circuits," G. R. Lyuta and T.A. Weil, Paper presented at Annual Modulator Symposium, 1973. (3) "Theory and Application of the Commutation Principle for HVDC Circuit Breakers,” A.N. Greenwood and T.H. Lee. (4) "HVDC Circuit Breakers,” A.N. Greenwood, P. Barkham, and W.C. Kracht.
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