| Presentation | 1998/1/29 Life of dispenser cathodes and oxide cathodes in laminar-flow type and crossover type electron guns Toshiharu HIGUCHI, Katsuhisa HOMMA, Takahiro KAWAHARADA, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Differences in the behavior of dispenser cathodes and oxide cathodes in laminar-flow type and crossover type electron guns were investigated by experiments and simulations under high-current-density conditions. When an oxide cathode is operated under such conditions, the heating effect due to Joule's heat in the oxide layer exceeds the cooling effect, depending on the product of the work function and the cathode current, resulting in a rise in the cathode temperature. This rise in cathode temperature aggravates deterioration of emission characteristics during the life of an oxide cathode. In the case of the dispenser cathode, however, the cathode temperature decreases under high-current-density conditions. When an oxide cathode in a crossover type electron gun is operated, there appear equipotential surfaces formed in the curved surface in the oxide layer. The formation of an equipotential surface leads to relaxation of the cathode loading. It is considered that this is the reason for the longer life of an oxide cathode in a crossover type electron gun than that of an oxide cathode in a laminar-flow type electron gun. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Dispenser cathode / Impregnated cathode / Oxide cathode / Emission characteristics / Cathode loading / Life |
| Paper # | EID97-83 |
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| Conference Information | |
| Committee | EID |
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| Conference Date | 1998/1/29(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Vice Chair | |
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| Paper Information | |
| Registration To | Electronic Information Displays (EID) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Life of dispenser cathodes and oxide cathodes in laminar-flow type and crossover type electron guns |
| Sub Title (in English) | |
| Keyword(1) | Dispenser cathode |
| Keyword(2) | Impregnated cathode |
| Keyword(3) | Oxide cathode |
| Keyword(4) | Emission characteristics |
| Keyword(5) | Cathode loading |
| Keyword(6) | Life |
| 1st Author's Name | Toshiharu HIGUCHI |
| 1st Author's Affiliation | TOSHIBA CORPORATION Electron Tube & Device Div.() |
| 2nd Author's Name | Katsuhisa HOMMA |
| 2nd Author's Affiliation | TOSHIBA CORPORATION Electron Tube & Device Div. |
| 3rd Author's Name | Takahiro KAWAHARADA |
| 3rd Author's Affiliation | TOSHIBA CORPORATION Cathode Ray Tube Div. |
| Date | 1998/1/29 |
| Paper # | EID97-83 |
| Volume (vol) | vol.97 |
| Number (no) | 519 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |