A new tangential gamma-ray spectrometer for fast ion measurements in deuterium and deuterium-tritium plasmas of the Joint European Torus

M. Nocente*, T. Craciunescu, G. Gorini, V. Kiptily, M. Tardocchi, V. Braic, M. Curuia, A. Dal Molin, J. Figueiredo, L. Giacomelli, M. Iliasova, Y. Kazakov, E. Khilkevitch, G. Marcer, E. Panontin, D. Rigamonti, M. Salewski, A. Shevelev, S. Soare, V. ZoitaI. Zychor

*Corresponding author for this work

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Abstract

A new tangential gamma-ray spectrometer has been developed for fast ion measurements in deuterium and deuterium-tritium plasmas of the Joint European Torus (JET). The instrument is based on a LaBr3 crystal with a photo-multiplier tube and replaces a pre-existing bismuth germanate detector, providing enhanced energy resolution and a counting rate capability in the MHz range. The line of sight is equipped with a LiH attenuator, which reduces the background due to 14 MeV neutron interactions with the crystal by more than two orders of magnitude and enables the observation of gamma-ray emission from confined α particles in JET deuterium-tritium plasmas. Thanks to its tangential line of sight, the detector can distinguish co- and counter-passing ions. The performance of the instrument is demonstrated through the results of recent JET fast ion experiments in deuterium plasmas.

Original languageEnglish
Article number043537
JournalReview of Scientific Instruments
Volume92
Issue number4
Number of pages5
ISSN0034-6748
DOIs
Publication statusPublished - 2021

Bibliographical note

Funding Information:
This work was carried out within the framework of the EUROfusion Consortium and received funding from the Euratom Research and Training Programme 2014–2018 and 2019–2020 under Grant Agreement No. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This scientific work was also supported by the Polish Ministry of Science and Higher Education within the frame-work of the scientific financial resources in the years 2015–2020 allocated for the realization of the international co-financed project.

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