Effects of beam perveance on the performance characteristics of theelectrically electron-suppressed beam direct converter with secondaryelectron suppressor grids

摘要

To determine the effects of beam perveance on the performancecharacteristics of a beam direct energy converter (BDC) with secondaryelectron suppressor grids and to examine the validity of the BDC design,helium beams of various energies and currents (from 15 keV, 60 mA up to20 keV, 250 mA) were injected to the BDC. Current recovery efficiency isfound to have a maximum near the designed perveance. A similardependence occurs for the 15- and 20-keV beams when collectors are at agrounded potential. With an increase of collector potentials, thereseems to be an increase in the efficiency between 15 and 20 keV. Netenergy recovery efficiencies in the experiments have shown that they arealmost constant in the region below the design perveance and then beginto decrease with an increase of beam perveance. It is found that thebeam perveance, rather than beam energy and current, constitutes a goodparameter in evaluating the performance characteristic of the BDC. Thedesign of the BDC is also found to be suitable