A non-magnetic femtosecond electron source device with adjustable convergence angle

A technology of convergence angle and electron source, applied in the direction of circuits, discharge tubes, electrical components, etc., can solve the problems of complex system and difficulty in adjusting the convergence angle, and achieve the effect of high adjustment accuracy and efficiency

Active Publication Date: 2021-07-27
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0006] The invention provides a non-magnetic femtosecond electron source device with adjustable convergence angle, which is used to solve the technical problem that the existing femtosecond electron source device has a complex system due to the use of magnetic elements for focusing, which leads to difficulty in adjusting the convergence angle in practical applications

Method used

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  • A non-magnetic femtosecond electron source device with adjustable convergence angle
  • A non-magnetic femtosecond electron source device with adjustable convergence angle
  • A non-magnetic femtosecond electron source device with adjustable convergence angle

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Embodiment 1

[0040] A non-magnetic femtosecond electron source device with adjustable convergence angle, such as figure 1 As shown, it includes: a vacuum chamber 1 provided with an excitation light window on the chamber body, and a photocathode 2, a grid 21, an anode 22, an electric converging mirror 3, and an electrical The objective lens 4; the photocathode is used to generate the femtosecond pulsed electron beam after the photoelectric effect occurs with the femtosecond laser pulse irradiated through the excitation light window 11; a voltage is applied between the photocathode and the anode for accelerating the electron beam; Both the voltage of the converging mirror and the electric objective lens can be adjusted, and are used to converge the accelerated electron beam twice to obtain parallel beams or converging beam electron pulses with the actual required convergence angle.

[0041] It should be noted that the vacuum chamber of the electron source device can be made of stainless stee...

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Abstract

The invention discloses a non-magnetic femtosecond electron source device with adjustable convergence angle, comprising: a vacuum cavity, and a photocathode, a grid, an anode, an electric converging mirror and Electric objective lens; the photocathode is used to generate femtosecond pulsed electron beams under the excitation of femtosecond laser pulses; a voltage is applied between the photocathode and the anode to accelerate the electron beams; the voltage of the electric convergence mirror and the electric objective lens can be adjusted. The accelerated electron beams are converged twice to obtain parallel beams or converging beam electron pulses with the actual required convergence angle. The invention adopts an electric convergence mirror and an electric objective lens to focus the pulsed electron beam twice, and the voltage of the electric convergence mirror and the electric objective lens can be flexibly adjusted, so that pulsed electron beams with different convergence degrees and beam spot sizes can be obtained. In addition, the electrostatic lens used in the present invention can greatly reduce the size of the electron source device, has a simple structure, and can further improve the quality and flexibility of the required electron beams.

Description

technical field [0001] The invention belongs to the field of electron microscopic imaging, and more specifically relates to a non-magnetic femtosecond electron source device with adjustable convergence angle. Background technique [0002] Ultrafast electron diffraction, which is a combination of electron diffraction and ultrashort laser pulses, has become a new technology in the field of electron microscopy imaging. Ultrafast electron diffraction has the ability to resolve time and space at the scale of atomic motion, and can realize real-time observation of ultrafast dynamic processes in both time and space structures. It has a wide range of applications in research in the fields of chemistry, materials and biology. [0003] The key to ultrafast electron diffraction is to obtain high-quality ultrashort electron pulses, which determine the time and space resolution of this technology and the ability to obtain information about the dynamic process of the object under study. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J37/073H01J37/12H01J37/21H01J37/26
CPCH01J37/073H01J37/12H01J37/21H01J37/261
Inventor 梁文锡胡春龙叶昶
Owner HUAZHONG UNIV OF SCI & TECH
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