Neutron spectroscopy measurements of 14 MeV neutrons at unprecedented energy resolution and implications for deuterium-tritium fusion plasma diagnostics

TitleNeutron spectroscopy measurements of 14 MeV neutrons at unprecedented energy resolution and implications for deuterium-tritium fusion plasma diagnostics
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2018
AuthorsRigamonti, D., Giacomelli L., Gorini G., Nocente M., Rebai M., Tardocchi M., Angelone Massimo, Batistoni P., Cufar A., Ghani Z., et al.
JournalMeasurement Science and Technology
Volume29
ISSN09570233
Keywords14 MeV neutrons, deuterium, Deuterium tritium fusion, Diamond detectors, Diamonds, Fusion reactions, Intrinsic energy resolution, Ions, Laboratories, National Physical Laboratory, Neutron beams, Neutron detectors, Neutron sources, Neutron spectrometers, Neutron spectroscopy, Neutrons, Plasma diagnostics, Quantitative estimation, Single crystal diamond, Single crystals, Spectroscopy, Spectrum Analysis, tritium
Abstract

An accurate calibration of the JET neutron diagnostics with a 14 MeV neutron generator was performed in the first half of 2017 in order to provide a reliable measurement of the fusion power during the next JET deuterium-tritium (DT) campaign. In order to meet the target accuracy, the chosen neutron generator has been fully characterized at the Neutron Metrology Laboratory of the National Physical Laboratory (NPL), Teddington, United Kingdom. The present paper describes the measurements of the neutron energy spectra obtained using a high-resolution single-crystal diamond detector (SCD). The measurements, together with a new neutron source routine 'ad hoc' developed for the MCNP code, allowed the complex features of the neutron energy spectra resulting from the mixed D/T beam ions interacting with the T/D target nuclei to be resolved for the first time. From the spectral analysis a quantitative estimation of the beam ion composition has been made. The unprecedented intrinsic energy resolution (<1% full width at half maximum (FWHM) at 14 MeV) of diamond detectors opens up new prospects for diagnosing DT plasmas, such as, for instance, the possibility to study non-classical slowing down of the beam ions by neutron spectroscopy on ITER. © Università degli studi di Milano-Bicocca.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85044178520&doi=10.1088%2f1361-6501%2faaa675&partnerID=40&md5=879af8c57cc27393c00ac1df966b2699
DOI10.1088/1361-6501/aaa675