| Автор | M J Albert |
| Автор | M A Atta |
| Автор | D Gabor |
| Дата выпуска | 1967-05-01 |
| dc.description | Tungsten wires coated with a mixture of tungsten powder, metallic thorium and a small addition of zirconium are found to have emission densities an order of magnitude better than thoriated-tungsten emitters at the same temperatures, and currents up to 30 A cm<sup>-2</sup> can be drawn. A further improvement is achieved if the tungsten powder is replaced by tungsten carbide. These cathodes can be operated at temperatures up to 1600°C, where a chemical change occurs. Replacing thorium by metallic lanthanum allows the lowering of the temperatures at equal emission by 200 degC. The safe limiting density is about 10 A cm<sup>-2</sup> in either case. Replacing zirconium by hafnium allows emission densities of about 100 A cm<sup>-2</sup> to be achieved before a chemical change occurs. The new cathodes make it possible to increase the intrinsic brightness in electron-optical devices by an order of magnitude over pure tungsten cathodes, at comparable lives. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | A new type of composite all-metal electron emitter for valves and electron-optical devices |
| Тип | paper |
| DOI | 10.1088/0508-3443/18/5/312 |
| Print ISSN | 0508-3443 |
| Журнал | British Journal of Applied Physics |
| Том | 18 |
| Первая страница | 627 |
| Последняя страница | 633 |
| Аффилиация | M J Albert; Department of Electrical Engineering, Imperial College of Science and Technology, London |
| Аффилиация | M A Atta; Department of Electrical Engineering, Imperial College of Science and Technology, London |
| Аффилиация | D Gabor; Department of Electrical Engineering, Imperial College of Science and Technology, London |
| Выпуск | 5 |
