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Updated: Mar 13, 2026

Neutron Crystallography Data Collection and Processing for Modelling Hydrogen Atoms in Protein Structures
Published on: December 1, 2020
On-demand neutron field customization via multiple neutron source assemblies
1Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai, 519082, China.
None:
Conventional neutron irradiation fields face inherent challenges in dynamically adjusting both spectral characteristics and spatial flux distributions. This study proposes a multi-port neutron source system based on compact high-intensity D-D neutron generators, achieving highly customizable neutron energy spectra and precise flux distribution control through coordinated regulation of epithermal (0.5 eV-10 keV) and fast neutron (>10 keV) ports. Geant4 simulations demonstrate that independent neutron moderator assembly (NMA) design and neutron yield adjustment at each port enable continuous spectral distributions from epithermal to fast neutron ranges, overcoming the fixed-spectrum limitation of conventional neutron sources. While six-port configurations significantly improve irradiation uniformity in large-volume samples, symmetric multi-port arrangements alter hybrid spectral characteristics through NMA synergy effects, increasing fast neutron components - a spectral gradient variation that presents both dose calculation challenges and new opportunities for homogeneous material irradiation applications. The system's unique advantages in neutron activation analysis and dynamic neutron imaging stem from D-D source yield controllability, distributed modular design, and port-specific spectral shaping capability. Building upon current developments in compact D-D neutron sources, this work provides an innovative technological platform for precision neutron science research.
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