On August 23, China’s "Eleventh Five-Year Plan" national major scientific and technological infrastructure — — China spallation neutron source has passed the national acceptance, put into formal operation, and will be open to users in various fields at home and abroad. This indicates that China has become the fourth country with spallation neutron source after Britain, America and Japan.
"Super microscope" is an ideal probe to study the microstructure of material.
What kind of scientific device is China spallation neutron source? Chen Hesheng, chief engineer of China spallation neutron source project and academician of China Academy of Sciences, said that China spallation neutron source is like a "super microscope" and an ideal probe for studying the microstructure of materials. For example, we can use spallation neutron source to study the residual stress of large metal parts, which is of great significance toIt is very important to improve the performance of key components of high-speed rail and aero-engine components, as well as the service performance of nuclear power plant components.. Besides,The spallation neutron source can be used for the study of combustible ice, magnetic materials and in-situ study of chemical reaction catalysts.
China spallation neutron originated from the start of construction in September 2011, with a construction period of 6.5 years. It is a scientific apparatus jointly built by China Academy of Sciences and Guangdong Province. China spallation neutron source device includes an 80 million electron volt negative hydrogen ion linear accelerator, a 1.6 billion electron volt fast cycle synchrotron, a target station, and three neutron scattering spectrometers for scientific experiments.
Experts from the Acceptance Committee organized by the National Development and Reform Commission believe that all the indicators of China’s spallation neutron source meet or exceed the approved acceptance indicators. The overall design of the device is advanced, and the quality of the developed equipment is excellent.The highest neutron efficiency of the target station and the comprehensive performance of three spectrometers have reached the international advanced level.
It is of great significance to solve the problem of "neck sticking"
Chen Hesheng revealed that since the trial operation in March 2018, the project equipment has been running stably and reliably. The first three spectrometers have completed 21 sample experiments and achieved the first batch of important scientific achievements. These experiments are aimed at the national key development fields, give full play to the characteristics of neutron scattering, have important scientific significance and representativeness, and cover many frontier and high-tech research and development fields such as energy, physics, materials and engineering, such as lithium-ion battery materials, rare earth magnetism, new high-temperature superconductivity, functional films and so on.
It is reported that China spallation neutron sourceMore than 90% of the devices and equipment are independently developed and localized.It fills the gap in the field of pulsed neutron application in China, and will be used for.Basic research and high-tech development in many fields provide a powerful research platform.,It is of great significance for China to explore frontier scientific issues, conquer key core technologies of the industry and solve the "stuck neck" problem.
▌ This article Source: CCTV News Synthesis
关于作者