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Travelling wave tube electron gun based on cold cathode of carbon nanotube

A carbon nanotube and electron gun technology, applied in the field of carbon nanotube cold cathode planar electron gun, can solve the problems of high cost, inconvenient use, complex structure, etc., and achieve the effects of reducing space charge effect, improving laminar flow, and reducing processing difficulty

Inactive Publication Date: 2016-05-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Application Information

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Problems solved by technology

However, the thermal emission cathode has the following significant disadvantages: complex structure, high cost, and the cathode system is composed of various metal and ceramic components. 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 The device is damaged, so the cathode system damage is the main reason for the failure of the electric vacuum device; on the other hand, due to the need for heating power, the complexity of the system is increased, the system efficiency is reduced, and it takes a long time to reach the working temperature, especially for high-power devices , its startup time is often as long as several minutes, which brings great inconvenience to the use

Method used

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  • Travelling wave tube electron gun based on cold cathode of carbon nanotube
  • Travelling wave tube electron gun based on cold cathode of carbon nanotube
  • Travelling wave tube electron gun based on cold cathode of carbon nanotube

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Embodiment Construction

[0013] This implementation mode takes a carbon nanotube cold cathode traveling wave tube electron gun as an example.

[0014] Set the specific dimensions as follows: the radius of the cathode carbon nanotube emission surface is 1mm, the distance from the grid is 0.3mm, and when the grid voltage is 3Kv, the first anode voltage is 18Kv, the second anode voltage is 23Kv, and the third anode voltage It is 25Kv, and the surface field strength of the cathode is sufficient to ensure that the carbon nanotube cold cathode emitting surface emits electrons under the existing carbon nanotube cathode preparation conditions. The extension length of the focusing pole is 2.3mm, and the angle between the arc surface of the focusing pole and the horizontal plane is 50°, which is smaller than that of ordinary arc electron guns, which is more conducive to the focusing of the electron beam. The inner diameter of the anode is 0.8mm, the distance between the first anode and the focusing electrode is...

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Abstract

The invention discloses a travelling wave tube electron gun based on a cold cathode of a carbon nanotube, belongs to the technical field of microwaves and millimeter waves, and specifically relates to a carbon nanotube cold cathode plane electron gun for a travelling wave tube. According to defects in the background technology, with the combination of the excellent performance of field emission materials of the carbon nanotube, a carbon nanotube field emission cold cathode is designed to replace a hot electrode of the travelling wave tube electron gun, the travelling wave tube electron gun can be developed towards frequency bands of millimeter waves and sub-millimeter waves with the device frequency, the reaction speed is fast, the efficiency is high, the dimension is small, the reliability is high, and the performance of electrical vacuum devices can be greatly enhanced.

Description

technical field [0001] The invention belongs to the field of microwave and millimeter wave technology, in particular to a carbon nanotube cold cathode planar electron gun used for traveling wave tubes. Background technique [0002] As the indispensable core devices of military electronic systems such as radar, electronic countermeasures, and space communications, microwave and millimeter wave electric vacuum radiation source devices have been widely valued. In the above-mentioned electric vacuum devices, the cathode and the electron optical system occupy a pivotal position. The system device generally adopts the thermal emission cathode system. After decades of development, the thermal emission cathode process has been very mature and is widely used in various electric vacuum devices. middle. However, the thermal emission cathode has the following significant disadvantages: complex structure, high cost, and the cathode system is composed of various metal and ceramic compone...

Claims

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Application Information

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IPC IPC(8): H01J23/065
CPCH01J23/065
Inventor 赵青杨兴兴林恩黄小平
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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