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High current density M-type cathodes for VEDs

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11 Author(s)
Ji Li ; Cathode Electron. Lab., Beijing Vacuum Electron. Res. Inst., China ; Zhiqiang Yu ; Wensheng Shao ; Ke Zhang
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The emission performance and life of most VEDs (vacuum electron devices) is directly related to the capability of cathode. As the main force of thermionic sources, dispenser cathodes made of a porous tungsten pellet impregnated with Ba, Ca aluminates, such as M type cathodes (coated with Osmium, Iridium or Osmium/Ruthenium) and scandate cathodes, play an important role in the electron beam devices. This paper presents some results obtained during the investigation of M-type cathodes used in TWTs (traveling wave tubes) and klystrons. The investigation covers the following experiments: (i) the lifetime test in close space diode to evaluate the long term life capability of M-type cathodes operated at different temperatures and loads to fulfill the missions for VEDs; (ii) the assessment of performances of M-type cathode delivery high current density up to 32A/cm2 in standard Pierce electron gun; (iii) the application of M-type cathode in practical X-band dual mode TWTs and Ka, X band MBKs (multi beam klystrons); (iv) the investigation of high reliable "quasi ceramic" potted heaters that shorten the warm-up time significantly. The experimental approach such as cathode structures, test vehicles and experimental techniques are also demonstrated in this paper.

Published in:

Vacuum Electron Sources Conference, 2004. Proceedings. IVESC 2004. The 5th International

Date of Conference:

6-10 Sept. 2004