Medium-low energy electron beam calibration device for detector and calibration method thereof

Abstract

The invention relates to a medium-low energy electron beam calibration device for a detector and a calibration method thereof. The device comprises a beta radioactive source, a dipolar magnet, a slitassembly, a vacuum system and a to-be-calibrated detector; the vacuum system comprises a vacuum bent pipe, a vacuum target chamber and a vacuum pump, and the vacuum pump is connected with the vacuum target chamber; the beta radioactive source is fixedly arranged on the end surface of a connecting rod, and the connecting rod is controlled by a stepping motor, so that the distance between the beta radioactive source and an incident port of the dipolar magnet is adjustable; the dipolar magnet is arranged at the bent part of the vacuum bent pipe; the slit assembly is arranged at an exit port of the dipolar magnet, and a detector to be calibrated is arranged in the vacuum target chamber and is close to the back of the slit assembly. A beta radioactive source is used for generating medium and low energy electrons, the magnetic field intensity of a dipolar magnet and the width of a slit are set, the energy and momentum dispersion of the electrons are selected, and a quasi-single-energy electron beam meeting requirements is obtained and used for detector calibration. The device and device can be widely applied to the field of medium-low-energy electron beam calibration.

Description

technical field [0001] The invention relates to a calibration device of a space detector, in particular to a calibration device of a middle and low energy electron beam used for a detector and a calibration method thereof. Background technique [0002] With the development of science and technology, human beings have accelerated the pace of space exploration, and the main methods are launching detection satellites and manned exploration. Since there are various radiation particles everywhere in space, and these radiation particles are mainly charged particles from the sun and the Milky Way, such as electrons, protons and various heavy ions, these charged particles have a destructive effect on the human body, materials and components, Affect the safety of space flight. Therefore, the study of space radiation environment is an important part of space exploration, and it is of great value to the protection of astronauts and the design of spacecraft. [0003] Among all radiati...

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Problems solved by technology

But there are also obvious disadvantages: first, the process of generating electrons by β-radiation sources is mainly β-decay, because β-decay is a three-body process, accompanied by the generation of neutrinos in the middle, so the energy of electrons generated by β-radiation sources is continuous, Unable to determine the energy of incident electrons, not suitable for energy calibration of detectors

However, the main problem of this method is that the cost of the electron accelerator calibration device is very expensive, the use is relatively complicated, and it requires the operation and maintenance of a professional technical team, which is not easy to promote

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