Design of a neutron-TPC prototype and its performance evaluation based on an alpha-particle test

【摘要】 A neutron-TPC(n TPC)is being developed for use as a fast neutron spectrometer in the fields of nuclear physics,nuclear reactor operation monitoring,and thermo-nuclear fusion plasma diagnostics.An n TPC prototype based on a GEM-TPC(Time Projection Chamber with Gas Electron Multiplier amplification)has been assembled and tested using argon-hydrocarbon mixture as the working gas.By measuring the energy deposition of the recoil proton in the sensitive volume and the angle of the proton track,the incident neutron energy can be deduced.A Monte Carlo simulation was carried out to analyze the parameters affecting the energy resolution of the n TPC,and gave an optimized resolution under ideal conditions.An alpha particle experiment was performed to verify its feasibility,and to characterize its performance,including energy resolution and spatial resolution.Based on the experimental measurement and analysis,the energy resolution(FWHM)of the n TPC prototype is predicted to be better than 3.2%for 5 Me V incident neutrons,meeting the performance requirement(FWHM<5%)for the n TPC prototype.更多还原

【Abstract】 A neutron-TPC(n TPC) is being developed for use as a fast neutron spectrometer in the fields of nuclear physics, nuclear reactor operation monitoring, and thermo-nuclear fusion plasma diagnostics.An n TPC prototype based on a GEM-TPC(Time Projection Chamber with Gas Electron Multiplier amplification) has been assembled and tested using argon-hydrocarbon mixture as the working gas.By measuring the energy deposition of the recoil proton in the sensitive volume and the angle of the proton track, the incident neutron energy can be deduced.A Monte Carlo simulation was carried out to analyze the parameters affecting the energy resolution of the n TPC,and gave an optimized resolution under ideal conditions.An alpha particle experiment was performed to verify its feasibility, and to characterize its performance, including energy resolution and spatial resolution.Based on the experimental measurement and analysis, the energy resolution(FWHM) of the n TPC prototype is predicted to be better than 3.2% for 5 Me V incident neutrons, meeting the performance requirement(FWHM<5%) for the n TPC prototype.更多还原