| 摘要 |
An electron gun arrangement which is particularly suitable for use in travelling wave tubes includes a substantially cylindrical ceramic body 20 which partly defines a vacuum envelope. The body 20 surrounds an electrode assembly constituted by cathode 21, grids 22, 23 and 24 and an anode 25. The leads to the grids and cathode are extensive in a generally longitudinal axial direction at the end of the body 20 remote from the anode 25, electrical connection being made via pins and metallised apertures extensive longitudinally through the wall of the body. The internal diameter of the body may be stepped to define ridges to which supports for parts of the electrode assembly are fixed. <IMAGE> |
