Klystrons and medical electron linear accelerators

A klystron comprising

• an output cavity, an output waveguide, and a coupling port, the output cavity being connected to the output waveguide through the coupling port, wherein
• the output cavity comprises a first space and a second space, the first space is configured for movement of electron beam, the second space deviates from a movement path of the electron beam, and protrudes outward from a side wall of the output cavity,
• wherein the second space is in an additional cavity, the additional cavity includes a first additional cavity, and the first additional cavity and the coupling port are located opposite to each other on two sides of a central axis of the output cavity.

A medical electronic linear accelerator comprising

• a klystron, wherein
• the klystron comprises an output cavity, an output waveguide, and a coupling port, the output waveguide is connected to a side wall of the output cavity through the coupling port, wherein
• an additional cavity is provided on the side wall of the output cavity, the additional cavity is connected with the output cavity and extends from a position connected to the output cavity in a direction away from a central axis of the output cavity.