Spiral-band-shaped electron beam cold cathode radiation source

Abstract

The invention discloses a spiral-band-shaped electron beam cold cathode radiation source which relates to the technical field of microwave, millimeter wave, submillimeter wave and tera-hertz electric vacuum device. The spiral-band-shaped electron beam cold cathode radiation source comprises a spiral-band-shaped electron beam cold cathode electron gun, a periodical structure metal housing, a collecting electrode and a guiding magnetic field generator, wherein the spiral-band-shaped electron beam cold cathode electron gun is composed of a cathode block, a cathode transmitting surface, an anode block and an electron gun packaging insulator. The cathode transmitting surface is rectangular. The lower surface of the anode block is an oblique surface which inclines to the right lower side. The anode block is arranged at the right upper part of the cathode block. The periodical structure meta housing is provided with an electron beam channel which penetrates through the left end and the right end of the periodical structure metal housing. The middle part of the electron beam channel is provided with a high-frequency structure which extends along the axial direction of the electron beam channel. The collecting electrode, the electron beam channel and the cathode transmitting surface are in a straight line. The invention provides the spiral-band-shaped electron beam cold cathode electron gun which has advantages of simple structure, long service life and excellent performance. Energy is generated through interaction between electron beam longitudinal speed and a high-frequency field, thereby realizing electromagnetic radiation.

Description

technical field [0001] The invention relates to the technical field of microwave, millimeter wave, submillimeter wave and terahertz electric vacuum devices, in particular to a cold cathode radiation source based on spiral ribbon electron injection. Background technique [0002] Field electron emission is a form of electron emission that is completely different in nature from thermionic emission. Thermionic emission is based on raising the temperature of the object, giving additional energy to the electrons inside the object, so that some high-energy electrons can escape over the potential barrier on the surface of the object. The current density that thermionic emission can provide is no more than a few hundred A / cm 2 , and there is still a period of hysteresis; but even if the metal is heated to a high temperature where significant evaporation occurs, the number of electrons that can escape only accounts for a very small part of the number of free electrons in the metal, a...

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Problems solved by technology

However, it is precisely because of the addition of a specific insulating medium that the medium is relatively thin, on the order of microns, so that it is easy to mix metal shavings or impurities in the manufacturing process, resulting in the presence of current on the surface of the medium, resulting in sparking and damage to the device. Work

At the same time, since the field emission is related to the strength of the surface electric field, the higher the electric field strength, the better in theory. Therefore, there is a very high requirement for the withstand voltage strength of the device, but the introduction of the medium in its structure greatly reduces the performance of the device. voltage resistance, but cannot generate large current

[0006] Therefore, this grid-controlled cold-cathode electron source array with embedded electrodes is not suitable for electric vacuum radiation source devices or devices requiring large currents

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