| 摘要 |
PURPOSE:To provide a large current and long life electron gun, which is an indirectly heated-type electron gun and used for an electron beam accelerator or an electron beam welding machine. CONSTITUTION:A cathode of an indirectly heated-type electron gun has a structure wherein a LaB6 single crystal cathode part 1 in which steps are formed is sandwiched between supporting bodies 2, 3. Glassy carbon 4 is filled in the mechanical gaps formed among the parts 1, 2, 3 and the resulting body is fixed to a supporting rod to give an indirectly heated type electron gun. The glassy carbon decreases the consumption of the LaB6 single crystal cathode and the steps formed in the LaB6 single crystal cathode prevents it from dropping out of the supporting bodies. As a result, the indirectly heated-type electron gun can have a long life. |
