The High-Efficiency Mode of Electromagnetic Launcher Operation

The high-efficiency mode of electromagnetic launcher (EML) operation is investigated. The high-efficiency mode for some launchers is achieved when the EML is operated in zero exit current (ZC) mode. Several power supply strategies to achieve high-efficiency ZC mode are presented. The investigation defines the ideal high-efficiency power supply for high-efficiency ZC mode launcher operation. The ideal power supply, in conjunction with a well-designed EML, will approximate an ideal launcher. The principles presented apply to all noninduction EMLs even though the discussion is limited to conventional railguns and helical launchers and augmented railguns and high-efficiency helical launchers. Theoretical predictions are in good agreement with experimental measurements.