Electron tube with transverse cyclotron interaction

Details Electron tube with transverse cyclotron interaction Electron tube with transverse cyclotron interaction

H - Electricity

01

J

353/5

H01J 25/34 (2006.01) H01J 25/38 (2006.01)

Patent

CA 1208365

- 16 - Abstract Electron Tube with Transverse Cyclotron Interaction An electron-beam tube for generating high microwave power at high frequencies comprises a fast-wave circuit such as a hollow waveguide. The circuit wave has a component of electric field perpendicular to its propagation axis. This field interacts with motions of the electrons transverse to the axis, in particular cyclotron rotation in an axial magnetic field. The above features are common to the well-known "gyrotrons". In the inventive tube the fast-wave circuit has means for locking a linearly polarized transverse- electric mode to the orientation of a circuit member such as the ridge in a ridged waveguide. The member (ridge) rotates spirally with distance along the guide. The added periodicity permits interaction with a space harmonic of the circuit wave. The -1 harmonic has a dispersion character- istic which provides beam-wave interaction over a wider frequency range than is possible in prior- art tubes of the gyrotron type.

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