Low-energy strong-beam gate-control electron gun

Abstract

The invention discloses a low-energy strong-beam gate-control electron gun. The low-energy strong-beam gate-control electron gun comprises an emitter, a focusing electrode, an intermediate electrode and a positive electrode, wherein the emitter and the focusing electrode are externally connected with the same negative high voltage power supply; the intermediate electrode is externally connected with a positive high voltage power supply; the positive high voltage of the intermediate electrode and the negative high voltage of the emitter form an accelerated electric field; the positive electrodeis grounded; the zero potential of the positive electrode and the positive high voltage of the intermediate electrode form a decelerated electric field; the emitter emits electron beams by using a negative gate assembly, and focuses the electron beams by using the focusing electrode, and meanwhile, can accelerate the electron beams through the accelerated electric field; finally, the electron beams are decelerated through the decelerated electric field; and the electrode shapes and distances between electrodes can be corrected by CST particle tracking and a PIC algorithm. The low-energy strong-beam gate-control electron gun is high in beam and can keep low beam energy dissipation, has the advantages of low energy, high beam guiding coefficient, high compression ratio, long service life and the like, and has relatively high practical value and wide application prospect.

Description

Technical field [0001] The invention belongs to the field of electron accelerators, and more specifically, relates to a low-energy high-current grid-controlled electron gun. Background technique [0002] The existing low-energy high-current electron guns are mostly high-conductivity dipole guns. When used, an external high-voltage pulse modulator is required to draw the electron beam, which is limited by the quality of the output waveform of the high-voltage pulse modulator. The output electron beam has the disadvantage of large beam energy dissipation. At the same time, the high conductance coefficient makes the space charge in the two-pole gun extremely strong, which brings about the disadvantages of strong electrode surface field, large beam spot size, and short range, which brings difficulties to the design of the electron gun and the processing and manufacturing of the electrode head. The output is difficult to meet the requirements of free electron laser (FEL) electron acc...

AI Technical Summary

Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a low-energy high-current gate-controlled electron gun, thereby solving the technical problems of poor beam quality and strong electrode surface field in the prior art under low-energy and high-current conditions

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