M type cathode life tests for space TWTs

Author

Cheng Cheng ; Li Ji ; Yu Zhiqiang ; Wang Hui

Author_Institution

Beijing Vacuum Electron. Res. Inst., Beijing, China

fYear

2010

fDate

14-16 Oct. 2010

Firstpage

27

Lastpage

28

Abstract

BVERI evaluated the M cathodes lifetime in 40 diodes and 18 electron guns (including 2 TWTs) in DC mode under the conditions of temperature acceleration and current density acceleration. The total accumulate time of 40 diodes and 18 electron guns (including 2 TWTs) were more than 681000 hours and 275000 hours separately. Based on the tiny change of cathode surface work function, the authors present the primary life model of the M cathode, which shows that the life of 6112M cathode operating at 999 °C_b are 331936 hours (37.9 years) at the current density of 1.0A/cm² and 254374 hours (29.0 years) at the current density of 2A/cm².

Keywords

cathodes; diodes; electron guns; life testing; travelling wave tubes; work function; BVERI evaluation; M cathodes lifetime; M type cathode life tests; cathode surface work function; current density acceleration; diodes; electron guns; space TWT; temperature acceleration; traveling wave tubes; Weapons; cathode life model; life test; space TWT;

fLanguage

English

Publisher

ieee

Conference_Titel

Vacuum Electron Sources Conference and Nanocarbon (IVESC), 2010 8th International

Conference_Location

Nanjing

Print_ISBN

978-1-4244-6645-0

Type

conf

DOI

10.1109/IVESC.2010.5644432

Filename

5644432