Title :
Thermionic emission of impregnated dispenser cathodes at low temperature
Author :
Zheng, Qiang ; Shengyi Yin ; Zhen Peng ; Yu Wang ; Xinxin Wang ; Yang Li
Author_Institution :
Key Lab. of High Power Microwave Sources & Technol., Inst. of Electron., Beijing, China
Abstract :
It has proved that the superior emission capability of a new type impregnated dispenser cathode through impregnates the BaO/SrO/Sc2O3 active substances and covers a mixture W+BaO/SrO/Sc2O3 coating by the pulse laser deposition. However, the thermionic emission of this impregnated dispenser cathode at low temperature is not clear. Our results illustrate that the Current-voltage characteristics of this new impregnated dispenser cathode preserve unsaturated behavior. The maximum of the current density is 2.1 Acm-2 occurring at 650°C for the applied voltage from 0 to 3000 V. These results provide hope to further investigate the emission mechanism and make this cathode also applicable for vacuum electron tubes.
Keywords :
barium compounds; current density; pulsed laser deposition; scandium compounds; strontium compounds; thermionic cathodes; thermionic emission; tungsten; vacuum tubes; W-BaO-SrO-Sc2O3; current density; current-voltage characteristics; impregnated dispenser cathodes; pulse laser deposition; temperature 650 degC; thermionic emission; unsaturated behavior; vacuum electron tubes; voltage 0 V to 3000 V; Cathodes; Coatings; Current density; Current-voltage characteristics; Pulsed laser deposition; Temperature; Thermionic emission; impregnated dispenser cathodes; low temperature; thermionic emission;
Conference_Titel :
Vacuum Electronics Conference (IVEC), 2013 IEEE 14th International
Conference_Location :
Paris
Print_ISBN :
978-1-4673-5976-4
DOI :
10.1109/IVEC.2013.6571066
