Carbon nanotube cold negative electrode based gyrotron electron gun

Abstract

The invention discloses a carbon nanotube cold negative electrode based gyrotron electron gun, and belongs to the technical field of microwave and millimeter waves. The electron gun comprises a negative electrode, a positive electrode and a magnetic control apparatus, wherein the negative electrode adopts a columnar metal structure with a tapered tail end; the electron gun is characterized in that a ring of carbon nanotubes are arranged around the tapered inclined surface at the tail end of the negative electrode; the positive electrode adopts a tubular metal structure with an electron cavity in the interior; the tapered tail end of the negative electrode is arranged in the electron cavity of the positive electrode; the inner diameter of the electron cavity of the positive electrode in an electron emitting direction becomes smaller in stages; a transitional section is arranged between adjacent stages to enable the stages of different inner diameters to be in smooth transition; and the magnetic control apparatus is arranged on the periphery of the positive electrode and used for controlling movement tracks of electrons. According to the carbon nanotube cold negative electrode based gyrotron electron gun, the magnetic control injection electron gun can be developed for realizing millimeter wave and sub-millimeter wave frequency bands along with frequencies of devices; and the electron gun has the advantages of high reaction speed, high efficiency, small size, high reliability and the like, so that the performance of an electric vacuum device can be greatly improved.

Description

technical field [0001] The invention belongs to the field of microwave and millimeter wave technology, in particular to a 140 GHz carbon nanotube cold cathode magnetron injection electron gun for supporting a gyrotron. Background technique [0002] Microwave and millimeter-wave electric vacuum radiation source devices have been widely valued as indispensable core devices for military electronic systems such as radar, electronic countermeasures, and space communications. Among the above-mentioned electric vacuum devices, cathodes and electron optical systems play a pivotal role. Traditional devices The thermal emission cathode system is generally used. After decades of development, the thermal emission cathode process has been very mature and has been widely used in various electric vacuum devices. However, the thermal emission cathode has the following significant disadvantages: complex structure, high cost, and the cathode system It is composed of a variety of metal and cer...

AI Technical Summary

Problems solved by technology

[0002] Microwave and millimeter-wave electric vacuum radiation source devices have been widely valued as indispensable core devices for military electronic systems such as radar, electronic countermeasures, and space communications. Among the above-mentioned electric vacuum devices, cathodes and electron optical systems play a pivotal role. Traditional devices The thermal emission cathode system is generally used. After decades of development, the thermal emission cathode process has been very mature and has been widely used in various electric vacuum devices. However, the thermal emission cathode has the following significant disadvantages: complex structure, high cost, and the cathode system It is composed of a variety of metal and ceramic parts. Since the hot cathode works in a high temperature environment of thousands of degrees, the heating filament in the cathode is easy to break or short circuit, resulting in device damage. Therefore, the damage of the cathode system is the main reason for the failure of the electric vacuum device; On the one hand, due to the need for heating power, the complexity of the system is increased, the efficiency of the system is reduced, and it takes a long time to reach the operating temperature. Especially for high-power devices, the startup time is often as long as several minutes, which brings great inconvenience to use.

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