| Автор | I Brodie |
| Автор | R O Jenkins |
| Дата выпуска | 1957-05-01 |
| dc.description | Measurements of the total secondary electron emission coefficient under electron bombardment δ have been made at room temperature on "L" cathodes and porous tungsten cathodes impregnated with barium calcium aluminates. For "L" cathodes δ decreases with increasing porosity due to the increased surface roughness but δ is always above that for clean tungsten, due to the activation of the surface by adsorbed layers. For the impregnated cathode, δ increases with increasing porosity due to the larger contribution from the impregnant in the pore ends which has a larger value of δ than the surrounding activated tungsten. δ for the impregnated cathode is above that for the "L" cathode and comparable with that for bulk barium oxide. Decay of δ under electron bombardment is observed in the case of the impregnated cathode but the initial value can always be recovered by heating. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Secondary electron emission from barium dispenser cathodes |
| Тип | paper |
| DOI | 10.1088/0508-3443/8/5/304 |
| Print ISSN | 0508-3443 |
| Журнал | British Journal of Applied Physics |
| Том | 8 |
| Первая страница | 202 |
| Последняя страница | 204 |
| Аффилиация | I Brodie; Research Laboratories, The General Electric Company Limited, Wembley, England |
| Аффилиация | R O Jenkins; Research Laboratories, The General Electric Company Limited, Wembley, England |
| Выпуск | 5 |
