Novel multifunctional positron beam measuring system

Abstract

The invention relates to the technical field of a positron beam measurement, and particularly relates to a novel multifunctional positron beam measuring system. The measuring system comprises a multifunctional measuring target room, a magnetic field focusing system, a positron annihilation service life measuring system, a Doppler broadening measuring system, and a compliance Doppler broadening measuring system. The measuring system can realize the multi-parameter measurement of the positron annihilation service life, the Doppler broadening and the compliance Doppler broadening, reduce the backscattering positron effect, decrease diameter of positron beam spot, and improve the instrument measuring efficiency.

Description

technical field [0001] The invention belongs to the technical field of positron beam measurement, and in particular relates to a novel multifunctional positron beam measurement system. Background technique [0002] Conventional positron annihilation spectroscopy experiments use positrons emitted by radioactive sources. Because of their high energy and invariability, they are mainly used to detect the defect characteristics in materials. The slow positron beam technology developed in the 1980s changes the energy of the positrons so that it can detect the microstructure of the material surface, near the surface and even in the body (micron scale). , size, concentration distribution, and emerging nuclear technologies for microscopic phases. In addition to many advantages of conventional positron beam technology (such as extremely sensitive to micro-defects and phase transitions, non-destructive testing, etc.), slow positron beam technology also has many new advantages, such as...

AI Technical Summary

Problems solved by technology

In addition, most of the current slow positron beam devices mainly measure the Doppler broadening of the slow positron beam, and the obtained information is limited; while the annihilation lifetime of positrons with different energies can study the defect information (defect type and number); the slow positron beam conforms to Doppler broadening and can also be used to study the momentum distribution of core electrons and give information on the change of chemical elements around the defect by reducing the background

However, due to the high price and complex structure, the multi-parameter measurement of positron annihilation lifetime, Doppler broadening and consistent Doppler broadening under the condition of slow positron beam is limited.

Images