Poisoning studies of an osmium-coated dispenser cathode
- 1 July 1990
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 68 (1) , 298-303
- https://doi.org/10.1063/1.347132
Abstract
The results of our studies on the reduction of the emission current from an osmium-alloy-coated dispenser cathode (derivative of the M cathode) due to exposure to various gases or vapors are reported. The primary interest of these studies is poisoning by chemical agents that might be encountered in the vacuum system of an induction linear accelerator. Of the constituents normally found in a tight unbaked vacuum chamber, the cathode is most sensitive to partial pressures of water vapor. Of the vapors studied which might be encountered in an induction accelerator, Freon was the most virulent poison.This publication has 4 references indexed in Scilit:
- The operation of coated tungsten-based dispenser cathodes in nonideal vacuumIEEE Transactions on Electron Devices, 1989
- A model for the impregnated cathode emission behaviour under ion bombardmentApplied Surface Science, 1985
- Surface studies of thermionic emitters by methods unique to themApplications of Surface Science, 1979
- Poisoning of LaB6 CathodesJournal of Applied Physics, 1969