HIGH-POWER HELICAL TRAVELING-WAVE TUBE Russian patent published in 2006 - IPC H01J25/34 

FIELD: microwave device design and technology.

SUBSTANCE: proposed traveling-wave tube is characterized in high specific heat load on helical slow-wave structure and in that its vacuum envelope is combined with magnetic circuit of periodic magnetic focusing structure. Insulating supports are joined with slow-wave structure helix by means of insulator solder whose melting point is over 1050 °C and with case assembled of magnetic-system pole shoes copper-soldered together, as well as with their separating bushings by means of metal solder whose melting point is 780 to 1000 °C. Nonmagnetic bushings separating pole shoes of periodic magnetic focusing structure are made of vacuum ceramics whose coefficient of linear thermal expansion is lower than that of pole-shoe and insulating-support materials. Expression for choosing thickness of nonmagnetic bushing is given in invention specification.

EFFECT: enhanced output power, mechanical strength, and reliability of traveling-wave tube.

15 cl, 4 dwg