Coherent electron beam preparation method based on cold atoms

Abstract

The invention discloses a coherent electron beam preparation method based on the cold atoms, and the method comprises the steps: obtaining a cold atom group with the temperature of million magnitude and the number of atoms greater than 108, preparing the outermost layer electron state of the atoms in the cold atom group to the ground state, and preparing the needed coherent electron beam in the following modes: controlling excitation photons and electrons to interact, exciting the electrons to the high-energy state, adopting low-noise electric field driving to lead out electrons, and obtaininglow-temperature electron beam output through an acceleration electromagnetic field. According to the invention, an electron preparation technology based on a cold atom host and a photon and electricfield precision control technology used in the electron preparation process are used, and compared with the traditional electron preparation technology carried out under the conditions of high voltage, high current, high field intensity and the like, the characteristics of the obtained electrons are greatly different. The problems of high temperature, high energy dissipation and low coherence of electron beams, which cannot be avoided in the traditional electron beam preparation technology, are solved from the source of electron generation, and the quality of electron beams can be comprehensively improved.

Description

technical field [0001] The invention relates to the technical field of e-book preparation, in particular to a method for preparing coherent electron beams based on cold atoms. Background technique [0002] Cold atoms keep atoms in a state of extremely low temperature. Due to their slow movement speed and stable energy level structure, cold atoms have a more definite quantum state than hot atoms. It is more conducive to controlling its quantum state, such as outer electron spin, atomic magnetic moment and so on. [0003] High-brightness, high-coherence, ultra-short time-domain electron beam preparation is the basis of high-temporal-spatial resolution electron diffraction technology and high-coherence X-ray free electron laser technology. Fields such as nuclear science and technology are indispensable. [0004] Common electron beam preparation technologies include high-voltage electron guns, photocathode emission sources, and cutting-edge emission sources. These technologies...

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Problems solved by technology

[0005] Therefore, the present invention provides a coherent electron beam preparation method based on cold atoms, which solves the unavoidable problems of electron beam high temperature, high energy dissipation, and low coherence in traditional electron beam preparation technology from the source of electron generation

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