Os-coated cathode for very high emission-density applications

Emission densities of 35 to 100 A/cm2, demanded by free-electron lasers (FEL's), have set far more stringent requirements on thermionic cathodes than what is considered state of the art with current technology. The purpose of the work described here is to evaluate Os-coated cathodes for these ultra-high-current-density applications. Organometallic CVD… (More)