Modelling third harmonic ion cyclotron acceleration of deuterium beams for JET fusion product studies experiments. (24th August 2016)

• Record Type: Journal Article
• Authors: Schneider, M.; Johnson, T.; Dumont, R.; Eriksson, J.; Eriksson, L.-G.; Giacomelli, L.; Girardo, J.-B.; Hellsten, T.; Khilkevitch, E.; Kiptily, V.G.; Koskela, T.; Mantsinen, M.; Nocente, M.; Salewski, M.; Sharapov, S.E.; Shevelev, A.E.
• Other Names: collab.
• Is Part Of: Nuclear fusion. Volume 56:Number 11(2016:Nov.)
• Publication Date: 2016-08-24
• Subjects: tokamak -- fast ions -- integrated modelling -- ICRH -- synthetic diagnostics -- neutron spectroscopy -- gamma spectroscopy; Nuclear fusion -- Periodicals; 621.48405
• DOI: 10.1088/0029-5515/56/11/112022
• Languages: English
• ISSNs: 0029-5515

Abstract

Abstract: Recent JET experiments have been dedicated to the studies of fusion reactions between deuterium (D) and Helium-3 ( 3 He) ions using neutral beam injection (NBI) in synergy with third harmonic ion cyclotron radio-frequency heating (ICRH) of the beam. This scenario generates a fast ion deuterium tail enhancing DD and D 3 He fusion reactions. Modelling and measuring the fast deuterium tail accurately is essential for quantifying the fusion products. This paper presents the modelling of the D distribution function resulting from the NBI+ICRF heating scheme, reinforced by a comparison with dedicated JET fast ion diagnostics, showing an overall good agreement. Finally, a sawtooth activity for these experiments has been observed and interpreted using SPOT/RFOF simulations in the framework of Porcelli's theoretical model, where NBI+ICRH accelerated ions are found to have a strong stabilizing effect, leading to monster sawteeth.