Benchmarking the Geant4 full system simulation of an associated alpha-particle detector for use in a D-T neutron generator

► Geant4-based full system model of an associated alpha-particle detector. ► Study the influence of different-sized fiber-optic faceplate on position performance. ► Study the influence of optical grease to its position performance. ► Less than 1 mm position uncertainty is expected for associated alpha-particle detector.► Study the influence of background radiations inside a D-T generator.