High-assembly-accuracy grid-control electronic gun

Abstract

The invention discloses a high-assembly-accuracy grid-control electronic gun which comprises a cathode hot wire component, a heat shield combination, a supporting cylinder combination, a control grid combination, a shadow grid combination, a gun shell combination and a magnetism shield welding cylinder combination. The electronic gun is reasonable in design, assembling parts of the electronic gun are screened out through a large number of experiments, and the electronic gun with high accuracy is obtained by assembling. The electronic gun is long in service life and high in reliability and stability, a specific-shaped electron beam can be provided for a coupled cavity traveling-wave tube, the assembling requirement of the high-standard coupled cavity traveling-wave tube can be well met, and the shortcomings of the prior art can be overcome.

Description

technical field [0001] The invention relates to an electron gun for a traveling wave tube, in particular to a gate-controlled electron gun with high assembly precision for a coupling cavity traveling wave tube, which can provide an electron beam of a specific shape for the coupling cavity traveling wave tube. Background technique [0002] As an important part of the traveling wave tube, the electron gun is the source of the input energy of the traveling wave tube, and its long life and high reliability are very important. And electron gun in the prior art has following shortcoming: [0003] 1. Under high current density, the cathode life is short; [0004] 2. Positive ions bounce back to the cathode under the electric field of the electron gun; [0005] 3. The insulation between the electrodes of the electron gun is poor, and it is easy to spark; [0006] 4. The electron beam is easily affected by the external electric field, and the state of the electron beam is easy to ...

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Problems solved by technology

[0005] 3. The insulation between the electrodes of the electron gun is poor, and it is easy to spark;

[0006] 4. The electron beam is easily affected by the external electric field, and the state of the electron beam is easy to change;

[0007] 5. The assembly precision is low, and it is impossible to emit electron beams of a specific shape that conform to the working of the coupling cavity traveling wave tube.

[0008] Due to the above deficiencies, the electron guns in the prior art have short service life, low precision, and low reliability, and cannot meet the assembly requirements of high-standard coupled cavity traveling wave tubes.

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