Title :
Ba/BaO evaporation measurement during accelerated life test
Author :
Wang, Tianzhi ; Zhang, Xiaobing ; Xiao, Mei ; Wang, Jinchan ; Gaertner, Georg ; Lei, Wei ; Huang, Chengxian
Author_Institution :
Display Technol. R&D Center, Southeast Univ., Nanjing, China
Abstract :
The Ba and BaO evaporation rates of a thermionic cathode have been measured at 145 K and 170 K above the typical operating temperature being about 1033 K. According to the measurement result, the relationship between cathode lifetime and operation temperature has been discussed. A comparison life test also be done between a poisoned but reactivated cathode and a normal one under the same condition. We found almost the same emission current at the beginning but different current decrease speed and Ba evaporation rate at the course of the life test.
Keywords :
barium compounds; electron tube testing; evaporation; life testing; thermionic cathodes; Ba-BaO; accelerated life test; cathode lifetime; evaporation measurement; temperature 1033 K; temperature 145 K; temperature 170 K; thermionic cathode; Cathodes; Current density; Electric variables measurement; Electronic equipment testing; Equations; Life estimation; Life testing; Mass spectroscopy; Strontium; Temperature measurement; Ba evaporation; acceleration life test; emission poisoning; oxide cathode;
Conference_Titel :
Vacuum Electronics Conference, 2009. IVEC '09. IEEE International
Conference_Location :
Rome
Print_ISBN :
978-1-4244-3500-5
Electronic_ISBN :
978-1-4244-3501-2
DOI :
10.1109/IVELEC.2009.5193518
