| Presentation | 2000/12/8 The emission characteristics of Ir-coated dispenser cathode with an emission enhanced area in the form of a fine-structured tungsten layer H. Miyamoto, M. Arai, T. Sato, H. Tamai, C. Kimura, |
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| PDF Download Page | PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | According to Richardson's equation, the high current-density cathode could be realized by the reduction of the work function and/or the increase of the value of the constant A'. Here, numerous attempts have been made of fabricating a high current-density dispenser cathode by reducing the work function. However, only few attempts have so far been made of fabricating such a dispenser cathode by increasing the magnitude of the constant A'. We therefore made an experiment where the value of the constant A' was increased by forming a large electron emission area of a fine-structured tungsten layer. The result was that the current density of the cathode with the increased emission area improved as compared with that of the conventional Ir-coated dispenser cathode. At 1050℃b, for example, the zero-field emission in our case was 16A/cm^2. Consequently, to increase the value of constant A' by increasing the emission area is a significant method of increasing the density of current from a cathode as well as reducing the work function. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | dispenser cathode / Richardson's equation / work function / constant A' / high current-density / zero-field emission |
| Paper # | ED2000-209 |
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| Conference Information | |
| Committee | ED |
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| Conference Date | 2000/12/8(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | |
| Vice Chair | |
| Secretary | |
| Assistant | |
| Paper Information | |
| Registration To | Electron Devices (ED) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | The emission characteristics of Ir-coated dispenser cathode with an emission enhanced area in the form of a fine-structured tungsten layer |
| Sub Title (in English) | |
| Keyword(1) | dispenser cathode |
| Keyword(2) | Richardson's equation |
| Keyword(3) | work function |
| Keyword(4) | constant A' |
| Keyword(5) | high current-density |
| Keyword(6) | zero-field emission |
| 1st Author's Name | H. Miyamoto |
| 1st Author's Affiliation | New Japan Radio co., Ltd.() |
| 2nd Author's Name | M. Arai |
| 2nd Author's Affiliation | New Japan Radio co., Ltd. |
| 3rd Author's Name | T. Sato |
| 3rd Author's Affiliation | New Japan Radio co., Ltd. |
| 4th Author's Name | H. Tamai |
| 4th Author's Affiliation | New Japan Radio co., Ltd. |
| 5th Author's Name | C. Kimura |
| 5th Author's Affiliation | New Japan Radio co., Ltd. |
| Date | 2000/12/8 |
| Paper # | ED2000-209 |
| Volume (vol) | vol.100 |
| Number (no) | 506 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |