| 摘要 |
PURPOSE:To obtain an easy to manufacture spiral delayed wave circuit with excellent heat resistant characteristics by melting and joining a metal wire and a metal enclosure using a low-melting metal in a traveling-wave tube. CONSTITUTION:A spiral 1 composed of tungusten as a high-melting metal and three beryllia rods 2 are fixed by a cupro-nickel wire 3 whose surface is wound tightly. Their assembly body is inserted in a metal enclosure 4 made of cupro- nickel. Then a low-melting metal 5 with a melting point of approximately 900 deg.C is melted and joins the metal wire 3 and the metal enclosure 4. Since the outer shape of the metal wire 3 wound tightly and the inner wall shape of the metal enclosure 4 are fit to each other, the joining surface ranges over all surfaces of the inner wall of the metal enclosure 4. As a result, as compared with the spiral delayed wave circuit by the conventional ''squeeze method'', the heat resistance between the spiral 1 and the metal enclosure 4 is reduced one third to one tenth and resistance to power is improved only for the same ratio. |
