Plasma core power exhaust in ELMy H-Mode in JET with ITER-Like Wall. (10th May 2018)

• Record Type: Journal Article
• Authors: Guillemaut, C; Metzger, C; Appel, L; Drewelow, P; Horvath, L; Matthews, G F; Szepesi, G; Solano, E R
• Other Names: collab.
• Is Part Of: Plasma physics and controlled fusion. Volume 60:Number 7(2018:Jul.)
• Publication Date: 2018-05-10
• Subjects: magnetic confinement fusion -- JET-ILW -- edge-localized mode -- power exhaust -- radiative cooling -- edge plasma physics; Plasma (Ionized gases) -- Periodicals; Controlled fusion -- Periodicals; 530.44
• DOI: 10.1088/1361-6587/aabd49
• Languages: English
• ISSNs: 0741-3335

Abstract

Abstract: The mitigation of target heat load in future steady state fusion devices will require dissipation of a significant amount of power through radiation. Plasma operations relying on ELMy H-modes could be problematic since ELMs may transport substantial amounts of power to the target without significant dissipation. Therefore, estimation of the average ELM power exhaust from the plasma core is crucial to evaluate the potential limitation on the power dissipation in ELMy H-mode regime. A series of more than 50 Type-I ELMy H-mode discharges in JET with ITER-Like Wall (JET-ILW) with a wide range of conditions has been used here to compare the average ELM power to the average input power. The effect of input power, ELM frequency, plasma current, confinement and radiation on ELM power exhaust has been studied and reported in this paper. Good agreement has been found here with previous studies made in carbon machines. This work suggests that it should not be possible to dissipate more than 70%–80% of the input power in Type-I ELMy H-modes in JET-ILW which is consistent with the maximum radiative fraction found experimentally.