Paper Abstract and Keywords |
Presentation |
2019-11-21 15:45
Volcano structured field emitter array for large current Yuta Nabuchi (AIST/Shizuoka Univ.), Masayoshi Nagao, Katsuhisa Murakami (AIST), Hidenori Mimura, Yoichiro Neo (Shizuoka Univ.) ED2019-65 Link to ES Tech. Rep. Archives: ED2019-65 |
Abstract |
(in Japanese) |
(See Japanese page) |
(in English) |
We have developed a Volcano-structured double gate Spindt-type field emitter arrays (VDGS-FEA). It can focus the electron beam without significant degradation of emission current. It was, however, difficult to operate at a high current more than 1 A/tip due to melt down by Joule heating. This is because the emitter material is restricted to Ni due to the unique fabrication method. We tried to use Ni-Mo alloy (Ni-Mo alloy) as emitter material for high current applications such as traveling wave tube (TWT). We compared emission characteristics between Ni and Ni-Mo alloy FEA. Ni FEA was damaged and broken when it emitted more than 1A/tip. On the other hand, Ni-Mo alloy FEA having 1000 tips reached a large emission current of about 1 mA. Lifetime test revealed that no degradation was observed at an emission current of more than 0.1 mA for 70 hours in the case of Ni-Mo alloy FEA having 1000-tips. We think that Ni-Mo alloy emitter will be a good solution for achieving high current operation and beam focusing simultaneously. |
Keyword |
(in Japanese) |
(See Japanese page) |
(in English) |
Spindt-type field emitter array / volcano-structure / Ni-Mo alloy / TWT / / / / |
Reference Info. |
IEICE Tech. Rep., vol. 119, no. 305, ED2019-65, pp. 25-28, Nov. 2019. |
Paper # |
ED2019-65 |
Date of Issue |
2019-11-14 (ED) |
ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
Copyright and reproduction |
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ED2019-65 Link to ES Tech. Rep. Archives: ED2019-65 |