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Scandate dispenser cathode for 220 GHz 50W sheet beam travelling wave tube amplifier

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6 Author(s)
Jinfeng Zhao ; Dept. of Electr. & Comput. Eng., Univ. of California-Davis (UCD), CA, USA ; Gamzina, D. ; Baig, A. ; Barnett, L.
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Nanocomposite Sc2O3-added tungsten dispenser cathodes were tested in Cathode Life Test Vehicles (CLTV) with a Pierce gun configuration under CW mode. The emission performance for both dc and pulsed current density remained consistent. In CLTV #1, owing to perveance issue (there is 100 micron gap between focus electrode and cathode emission surface), 10 A/cm2 dc current density can be acquired at practical temperature of 1120°C Br for more than 2000 hours. In CLTV #2 with reduced FE gap, 45 A/cm2 dc current density is obtained.

Published in:

Infrared, Millimeter and Terahertz Waves (IRMMW-THz), 2011 36th International Conference on

Date of Conference:

2-7 Oct. 2011