Using HfC(210) and HfC(110) as high brightness electron sources

Abstract

We report on high-brightness, thermal-field emission cathodes using (210) and (110) oriented hafnium carbide. HfC(210) cathodes are shown to deliver very high angular intensities to >50 mA/sr and remain stable. Modeling and experimental data are shown which highlights the utility of these sources for SEM and other high-brightness uses.