| 摘要 |
In electron gun arrangements particularly suitable for high power use such as in klystrons and IOTs, a grid support member (11) and cathode support member (17) are spaced apart by a known distance using a plurality of cylindrical ceramic posts (16) distributed equidistantly around their circumference. The ceramic posts (16) are located in slots (20) in the members (11,17) and arranged such that as the temperature, and hence the dimensions, of the gun assembly changes the distance d remains substantially constant. Hence, the spacing between the grid (6) and cathode (3) is maintained at substantially the predetermined required value. The posts (16) also permit transverse alignment to be maintained. |
