Neutronic calculations in support of the design of the ITER High Resolution Neutron Spectrometer

This paper presents the results of neutronic calculations performed to address important issues related to the optimization of the ITER HRNS (High resolution Neutron Spectrometer) design, in particular concerning the definition of the collimator and the choice of the detector system. The calculation...

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Bibliographic Details
Published in:Fusion engineering and design 2011-10, Vol.86 (6), p.1277-1281
Main Authors: Moro, F., Esposito, B., Marocco, D., Villari, R., Petrizzi, L., Sunden, E. Andersson, Conroy, S., Ericsson, G., Johnson, M. Gatu, Dapena, M.
Format: Article
Language:English
Subjects:
Analysis
Applied sciences
Collimators
Computer simulation
Controled nuclear fusion plants
Design
Design engineering
Detectors
Diagnostic
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Experimental methods and instrumentation for elementary-particle and nuclear physics
High resolution
Installations for energy generation and conversion: thermal and electrical energy
ITER
Mathematical models
Monte Carlo methods
Neutron
Neutron sources
Neutron spectrometers
Nuclear physics
Particle sources and targets
Physics
Spectrometer
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Summary:This paper presents the results of neutronic calculations performed to address important issues related to the optimization of the ITER HRNS (High resolution Neutron Spectrometer) design, in particular concerning the definition of the collimator and the choice of the detector system. The calculations have been carried out using the MCNP5 Monte Carlo code in a full 3-D geometry. The HRNS collimation system has been included in the latest MCNP ITER 40° model (Alite-4). The ITER scenario 2 reference DT plasma fusion neutron source peaked at 14.1 MeV with Gaussian energy distribution has been used. Neutron fluxes and energy spectra (>1 MeV) have been evaluated at different positions along the HRNS collimator and at the detector location. The noise-to-signal ratio (i.e. the ratio of collided to uncollided neutrons), the breakdown of the collided spectrum into its components, the dependency on the first wall aperture and the gamma-ray spectra at the detector position have also been analyzed. The impact of the results on the design of the HRNS diagnostic system is discussed.
ISSN:0920-3796
1873-7196
1873-7196
DOI:10.1016/j.fusengdes.2011.02.049