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Updated: May 24, 2026

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Published on: May 7, 2021
A neutron diagnostic for high current deuterium beams
1CNISM, Dipartimento di Fisica, Università degli Studi di Milano-Bicocca, Milano, Italy. marica.rebai@mib.infn.it
A new neutron diagnostic, Close-contact Neutron Emission Surface Mapping (CNESM), is proposed for the SPIDER facility. This system maps neutron emissions from deuterium beams, advancing fusion energy research.
Area of Science:
- Nuclear Fusion Engineering
- Plasma Physics
- Particle Accelerators
Background:
- High current deuterium beams are crucial for fusion energy research.
- Accurate diagnostics are needed to understand beam behavior and optimize performance.
- Existing methods may lack the spatial resolution for detailed beam analysis.
Purpose of the Study:
- To propose and design a novel neutron diagnostic system for the SPIDER test facility.
- To enable detailed mapping of neutron emission from deuterium beams.
- To serve as a precursor for advanced diagnostics on future fusion devices like MITICA.
Main Methods:
- Development of the Close-contact Neutron Emission Surface Mapping (CNESM) diagnostic.
- Utilizing Gas Electron Multiplier (GEM) detectors with integrated neutron-proton converter foils (polythene/aluminum cathode).
- Simulations using MCNPX code to model neutron scattering and detection efficiencies.
Main Results:
- CNESM is designed to detect neutrons with energy >2.2 MeV and incidence angles < 45°.
- The system provides close-contact mapping of neutron emission on the beam dump surface.
- Simulations validate the diagnostic's design for neutron detection from deuteron beam interactions.
Conclusions:
- The CNESM diagnostic offers a viable method for mapping neutron emission from high current deuterium beams.
- This technology represents a significant advancement for diagnostics on the SPIDER facility.
- CNESM is a foundational step for implementing similar diagnostics on the MITICA beam test facility to resolve beam intensity profiles.
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