Patent ID: 7034463

Claim:
A traveling-wave tube comprising: an electronic gun unit for generating an electron beam; a high-frequency circuit for amplifying high-frequency power through the interaction of an electron beam with a high-frequency electric field; and a collector unit for collecting an electron beam, said collector unit including: a collector electrode for collecting the electron beam; an insulator disposed around and in contact with the outer peripheral surface of said collector electrode, said insulator having a slit extending generally in parallel with a tube axis; a radiator made in one piece and disposed outside of and in contact with said insulator, said radiator having a contact surface in contact with a predetermined mounting member, a slot formed on a surface of said radiator opposite to the contact surface and extending generally in parallel with the tube axis throughout the length of said radiator, and one or more grooves intersecting the slot at right angles, a portion of said insulator including said slit being exposed to the slot; a fastening member received in said groove, said fastening member having a length shorter than the length of the groove, and formed with screwed holes extending through both end portions thereof in an axial direction of said fastening member; and bolts each screwed into each said screwed hole of said fastening member through a throughhole formed through said radiator.