中国物理学会高能物理分会第十三届全国粒子物理学术会议（2021）

Neutron science and technology plays an irreplaceable role in national defense and industry. China spallation neutron source (CSNS) is a major science and technology platform for multidisciplinary applications. As one of the most expensive core equipment of neutron instruments, the neutron detector suffers from the technical blockade from the developed countries, and has become a neck bottle problem restricting the construction and operation of neutron instruments at CSNS. Based on the requirements of the instruments, many common key technologies of neutron detectors have been solved, a detector system of large-scale engineering application has been preliminarily established. A professional and young team has been cultivated to be engaged in developing the advanced neutron detectors. The team has completed the construction of neutron detectors for General Purpose Powder Diffractometer (GPPD), Small Angle Neutron Scattering (SANS) and Multifunctional Reflectometer (MR). The team developed a large area of scintillator detector (5 m2) (shown in Fig.1 (a) ), a large area of 3He tube detector (1 m2) (shown in Fig.1 (b)), 3He MWPC detector (shown in Fig.1 (c)), high flux two-dimensional GEM neutron detector, neutron imaging detector and seven GEM neutron beam monitors (shown in Fig.1 (d)). These detectors passed the national acceptance in August 2018 and the performances reach or even exceed the international advanced level. In the next stage, the detectors will be further developed to realize better performances including larger area, higher spatial resolution, higher detection efficiency and higher integration. These detectors will be provided for many neutron sources in China and this will promote the vigorous development of neutron science and technology in China.