CESIUM VAPOR CATHODE STUDY.
Final rept. for 2 Dec 63-30 Nov 64,
RCA LABS PRINCETON N J
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Cesium-plasma cathodes have been studied as sources of very high-density electron beams. The commonemitter type of cathode using a highly directed cesiumvapor flow has been used to obtain a beam with a density of 800 Asq cm. The beam was accelerated to 1.2kV without any occurrence of voltage breakdown or instabilities. The electron temperature is of the order of only twice the cathode temperature. A continuous current of 7 A has been extracted from a commonemitter cathode. It was possible to extract all emitted electrons from all common-emitter tubes tested. The separate-emitter type of tube with properly activated cathodes and directed vapor flow should provide beams with densities of 100 Asq cm. Calculations have been made describing the stability and electron extraction from effusing, synthesized plasmas. Comparisons of theoretical and measured results are in fair agreement. A silver chloride seal has been shown to be a long-life seal for a tube using hot cesium vapor. Author