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Special features of electron sources with CNT field emitter and micro grid

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3 Author(s)
Knapp, W. ; Inst. fur Experimentelle Phys., Otto-von-Guericke-Univ., Magdeburg, Germany ; Schleubner, D. ; Wolff, H.

A micro-sized electron source has been developed for new vacuum triode applications. The miniaturisation of the electron source was achieved by the use of a carbon nanotube (CNT) field emitter and a micro grid, with a distance of only some micrometers. Because of the threshold field strength for field emission of CNTs being in the range 1 to 5 V/μm, the grid voltage can be lower than 100 V. In our contribution, we discuss the influence of the micro grid on electron source properties, especially anode field penetration through the micro grid, and micro-lensing effect.

Published in:

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

Date of Conference:

6-10 Sept. 2004