Abstract
A Bonner sphere spectrometer (BSS) was developed for neutron diagnostic on HL_2A Tokamak. It contains eight polyethylene spheres embedded with SP9 3He proportional counter. Before setting up on the Tokamak experimental hall, a verification experiment was arranged on a 241Am–Be neutron source to test its spectrometry capability. The neutron response functions were calculated by Monte Carlo code Geant4 to simulate the real measurement environments. By least square method, the neutron spectrum was finally unfolded on log domain from 0.1 eV to 11 MeV. It has a remarkable consistency to the ISO 8529-1 standard 241Am–Be neutron spectrum. This shows that the BSS is effective and reliable for neutron spectrum determination.
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