Abstract
Many new instruments at China Spallation Neutron Source (CSNS) require 3He-free neutron detectors with high counting rate capability to match the high neutron flux provided. The GEM(Gas Electron Multiplier)-based neutron detector is one of few detectors that can operate under direct irradiation from a neutron beam. A prototype detector was constructed using 10 GEM foils of 200 mm × 200 mm. To improve the detection efficiency, eight of the GEM foils and two cathodes were coated with enriched boron (96% 10B). To investigate its basic characteristics, several neutron beam tests were carried out at CSNS and the China Mianyang Research Reactor (CMRR). The spatial resolution of the GEM-based neutron detector was below 2.94 ± 0.01 mm (FWHM). Using monoenergetic neutrons at a wavelength of 4.9 Å, the detection efficiency was 54 ± 2%, consistent with the efficiency of 52% given by a Geant4 simulation. The wavelength spectrum measured with this detector using the TOF(Time Of Flight) approach at CSNS agreed well with that measured using a 3He tube. The results show that the GEM-based neutron detector is an ideal candidate to measure the direct neutron beam. Its overall detection efficiency is close to that of conventional 3He neutron detectors.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
