Scandate cathodes have the potential to replace conventional cathodes because of their improved emission characteristics. Nevertheless, it remains a challenge in this field to produce scandate cathodes with uniform surface emission in a reproducible manner. In this study, we report on scandate cathode emitters prepared from a novel nano-scandia/tungsten composite powder. Processing improvements have been developed to yield high-quality emitter surfaces. Emission testing demonstrates a greater than 200°C decrease (improvement) in knee temperature versus the standard M-type cathode. There is an on-going effort to quantify the work function of the cathode surface prior to and following activation.
|Title of host publication||2020 IEEE 21st International Conference on Vacuum Electronics, IVEC 2020|
|Number of pages||2|
|State||Published - Oct 19 2020|
|Event||21st IEEE International Conference on Vacuum Electronics, IVEC 2020 - Monterey, United States|
Duration: Oct 19 2020 → Oct 22 2020
|Name||2020 IEEE 21st International Conference on Vacuum Electronics, IVEC 2020|
|Conference||21st IEEE International Conference on Vacuum Electronics, IVEC 2020|
|Period||10/19/20 → 10/22/20|
Bibliographical noteFunding Information:
This work was financially supported by Engi-Mat Co. (formerly nGimat LLC) through U.S. Navy STTR contract N00253-17-C-0014.
© 2020 IEEE.
- Knee temperature
- Scandate cathode
- Scandia nanopowder
- Work function
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Electronic, Optical and Magnetic Materials