Ion heating by nonlinear Landau damping of high-n toroidal Alfvén eigenmodes in ITER. (11th August 2021)

• Record Type: Journal Article
• Authors: Seo, Jaemin; Na, Y.-S.; Hahm, T.S.
• Is Part Of: Nuclear fusion. Volume 61:Number 9(2021)
• Publication Date: 2021-08-11
• Subjects: energetic particles -- toroidal Alfvén eigenmodes -- nonlinear Landau damping -- ITER -- alpha channeling -- burning plasmas; Nuclear fusion -- Periodicals; 621.48405
• DOI: 10.1088/1741-4326/ac17c0
• Languages: English
• ISSNs: 0029-5515

Abstract

Abstract: Bulk ion heating from nonlinear Landau damping of high- n toroidal Alfvén eigenmodes (TAEs) excited by energetic ions is studied. Based on the nonlinear saturation level of high- n TAEs which is confirmed by numerical studies of a wave-kinetic equation incorporating the ion Compton scattering-induced spectral transfer and the particle trapping by the wave, we assess potentially beneficial effect of bulk ion heating, so-called alpha channeling for ITER DT plasmas using an integrated simulation. The result indicates that, in its optimistic limit, the anomalous ion heating due to high- n TAEs can compensate the heating reduction due to energetic particle loss.