A cold cathode radiation source based on spiral ring electron injection

Abstract

The invention discloses a cold cathode radiation source based on spiral annular electron injection, which belongs to the technical field of microwave, millimeter wave, submillimeter wave and terahertz frequency band radiation sources, including an electron gun, an input structure, an output structure, a high frequency system, a collector, and an electron gun It includes a cathode, a first anode, a second anode, and a third anode. The cathode is fixed on the base of the electron gun, and the cathode is provided with carbon nanotubes for emitting electrons; the first anode is facing the carbon nanotubes, and the first anode, the second The anode and the third anode are arranged along the propagation direction of the electron beam; the electron gun, the high-frequency system, and the collector are connected in sequence, and the input structure and the output structure are connected to the two ends of the high-frequency system. The present invention utilizes the interaction between the spirally moving electrons and the high-frequency field, and then transfers the longitudinal energy of the spirally moving electrons to the high-frequency field to realize electromagnetic radiation, effectively solving the electron interception caused by the structure of the cold cathode grid-controlled electron gun , low pass rate, uneven emission current, ignition and a series of problems.

Description

technical field [0001] The invention relates to the technical field of radiation sources in microwave, millimeter wave, submillimeter wave and terahertz frequency bands, in particular to a cold cathode radiation source based on spiral annular 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 i...

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Problems solved by technology

[0007] The purpose of the present invention is to address the defects in the background technology, and propose a cold cathode radiation source based on spiral annular electron injection, which utilizes the interaction between electrons in spiral motion and high-frequency fields, and then transfers the longitudinal energy of electrons in spiral motion to High-frequency field, realize electromagnetic radiation, use anode electric field to pull out cathode electrons, use longitudinal magnetic field to change electron beam trajectory, effectively solve electron interception, low pass rate, uneven emission current, sparking caused by cold cathode gate-controlled electron gun structure and a series of questions

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