Method of Controlling Current Stability During Field Emission Cathode Testing and Aging

Abstract

The invention relates to a field electron emission field. In order to solve a problem of current emission stability during a field emission cathode testing and aging process, the invention provides a field emission electron source device. The field emission electron source device comprises a dipolar field emission electron source, a vacuum cavity, a vacuum pump system, a high voltage power supply, a high voltage pulse driving unit, a vacuum environment monitoring unit, and a control platform. The dipolar field emission electron source is disposed in the vacuum cavity, and the high voltage power supply and the high voltage pulse unit are connected with the anode and the cathode of the dipolar field emission electron source by vacuum cavity flanges. The control platform is connected with the high voltage power supply, the vacuum environment monitoring unit, and the high voltage pulse driving unit by communication cables. The feedback compensation of the field emission voltage is carried out, and therefore stable control over emission current is realized, and strong practicability is provided. The invention also provides a method of using the above mentioned device to control the current stability during the field emission cathode testing and aging process.

Description

technical field [0001] The present invention generally relates to the field of field electron emission, and more specifically relates to a field electron emission source device and a method for controlling current stability in the field emission cathode test and aging process by using the same. Background technique [0002] Field emission refers to the process of electrons escaping under the action of an external electric field, that is, under the action of an external electric field, the height of the cathode surface barrier becomes lower and the width becomes narrower, and a large number of electrons escape through the surface barrier due to the quantum tunneling effect. without the need for additional energy. The field emission cathode has the characteristics of low operating temperature, high time resolution, and programmable emission, and has broad application prospects in the fields of X-ray tubes and X-ray imaging. However, due to the influence of the growth process,...

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Problems solved by technology

[0004] Aiming at the deficiencies in the prior art above, the present invention provides a field electron emission source device and a method for controlling the current stability in the field emission cathode test and aging process by using it, so as to effectively solve the problems in the field emission cathode test and aging process. Issues with current emission stability, cost, and difficulty of implementation

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