| Автор | L J Herbst |
| Автор | J E Houldin |
| Дата выпуска | 1955-07-01 |
| dc.description | The impedance of the oxide-coated cathode of disk seal triodes has been measured at frequencies from 730 to 2360 Mc/s and with cathode temperatures from 1250 to 1400° K. The main feature of the method is the use of a photocell for indicating constancy of cathode temperature. Changes of 0.5° K could be measured. The behaviour of the coating is consistent with an equivalent circuit consisting of the grid-cathode capacitance C<sub>1</sub> in series with the coating resistance R.Measurements of the d.c. coating resistance have also been made and the values agree approximately with those obtained at radio frequency. Values of R correspond to specific conductivities of between 0.3 and 0.4 Ω<sup>-1</sup> m<sup>-1</sup> at a cathode temperature of 1250° K, and R is found to decrease with temperature.Finally a method is outlined which utilizes the change of heater resistance with cathode temperature to determine the power dissipated in the coating under oscillatory conditions. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | The resistance of the oxide-coated cathode at ultra high frequencies |
| Тип | paper |
| DOI | 10.1088/0508-3443/6/7/303 |
| Print ISSN | 0508-3443 |
| Журнал | British Journal of Applied Physics |
| Том | 6 |
| Первая страница | 236 |
| Последняя страница | 238 |
| Аффилиация | L J Herbst; Department of Physics and Mathematics, College of Technology, Birmingham |
| Аффилиация | J E Houldin; Department of Physics and Mathematics, College of Technology, Birmingham |
| Выпуск | 7 |
