Scandate dispenser cathodes with sharp transition and their application in microwave tubes

IEEE Transactions on Electron Devices

Volumn 61, Issue 6, 2014, Pages 1754-1759

  Vancil, Bernard ^a   Brodie, Ivor ^b   Lorr, John ^a   Schmidt, Victor ^a  

^a E BEAM INC   (United States)

^b UNIVERSITY OF CALIFORNIA   (United States)

Author keywords

Cathodes; dispenser; impregnated; scandate; thermionic

Indexed keywords

CATHODES; DISPENSERS; MICROWAVE TUBES; TEMPERATURE; THERMIONIC CATHODES;

DOPING TECHNIQUES; IMPREGNATED; SCANDATE CATHODES; SCANDATE DISPENSER CATHODES; SCANDATES; SHARP TRANSITION; TEMPERATURE LIMITEDS; THERMIONIC;

ELECTRODES;

EID: 84901419651     PISSN: 00189383     EISSN: None     Source Type: Journal    
DOI: 10.1109/TED.2014.2309279     Document Type: Article

References (12)

1. B. Vancil, I. Brodie, V. Schmidt, and J. Lorr, "Scandate cathode with sharp transition," in Proc. 14th Int. Vac. Electron. Conf., Paris, France, May 2013, pp. 1-2.
2. W. Liu, Y. Wang, L. Zhao, L. Li, X. Zhang, and J. Wang, "Emission characteristics of Sc-doped dispenser cathodes in electron gun open structures," in Proc. IEEE Vac. Electron. Conf., May 2010, pp. 403-404.
3. J. Hasker, J. Van Esdonk, and J. E. Crombeen, "Properties and manufacture of top-layer scandate cathodes," Appl. Surf. Sci., vol. 26, no. 2, pp. 173-195, 1986.
4. Y. Wang, J. Wang, W. Liu, K. Zhang, and J. Li, "Development of high current density cathodes with scandia doped tungsten powders," IEEE Trans. Electron Devices, vol. 54, no. 5, pp. 1061-1069, May 2007.
5. W. Liu, Y. Wang, J. Wang, Y. Wang, and B. Vancil, "Emission characteristics of nano-sized scandia-doped dispenser cathodes in open electron-gun structures," IEEE Trans. Electron Devices, vol. 58, no. 4, pp. 1241-1246, Apr. 2011.
6. I. Brodie, "A new model for the mechanism of operation of scandate and refractory oxide cathodes," IEEE Trans. Electron Devices, vol. 58, no. 4, pp. 1247-1254, Apr. 2011.
7. C. Wan and M. E. Kordesch, "Tungstate formation in a model scandate thermionic cathode," J. Vac. Sci. Technol. B, vol. 31, no. 1, p. 011210, 2013.
8. R. S. Raju and C. E. Maloney, "Characterization of an impregnated scandate cathode using a semiconductor model," IEEE Trans. Electron. Devices, vol. 41, no. 12, pp. 2460-2467, Dec. 1994.
9. D. A. Wright and J. Woods, "The emission from oxide-coated cathodes in an accelerating field," Proc. Phys. Soc., vol. 65, no. 2, pp. 134-145, 1952.
10. Y. Wang, J. Wang, W. Liu, and X. Zhang, "Correlation between emission behavior and surface features of scandate cathodes," IEEE Trans. Electron Devices, vol. 56, no. 5, pp. 776-785, May 2009.
11. X. Zhang, Y. Wang, J. Wang, and W. Liu, "Characterization of scandate cathode emission," in Proc. IEEE Vacuum Electron. Conf., Apr. 2009, pp. 413-414.
12. J. Zhao et al., "High current density and long life nanocomposite scandate dispenser cathode fabrication," in Proc. Int. Vac. Electron. Conf., 2010, pp. 425-426.