Ion target impact energy during Type I edge localized modes in JET ITER-like Wall

0453868 - ÚFP 2016 RIV GB eng J - Journal Article
Guillemaut, C. - Jardin, A. - Horáček, Jan - Autrique, A. - Arnoux, G. - Boom, J. - Brezinsek, S. - Coenen, J.W. - De La Luna, E. - Devaux, S. - Eich, T. - Giroud, C. - Harting, D. - Kirschner, A. - Lipschutz, B. - Matthews, G.F. - Moulton, D. - O’Mullane, M. - Stamp, M.
Ion target impact energy during Type I edge localized modes in JET ITER-like Wall.
Plasma Physics and Controlled Fusion. Roč. 57, č. 8 (2015), č. článku 085006. ISSN 0741-3335. E-ISSN 1361-6587
R&D Projects: GA MŠMT LG14002
EU Projects: European Commission(XE) 633053
Institutional support: RVO:61389021
Keywords : magnetic confinement fusion * edge localized modes * JET ITER-like wall * plasma * tokamak
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 2.404, year: 2015
http://dx.doi.org/10.1088/0741-3335/57/8/085006

The ITER baseline scenario, with 500 MW of DT fusion power and Q = 10, will rely on a Type I ELMy H-mode, with ΔW = 0.7 MJ mitigated edge localized modes (ELMs). Tungsten(W) is the material now decided for the divertor plasma-facing components from the start of plasma operations. W atoms sputtered from divertor targets during ELMs are expected to be the dominant source under the partially detached divertor conditions required for safeITER operation. In this paper, coupled thermography and Langmuir Probe (LP) measurements in JET-ITER-Like-Wall unseeded H-mode experiments with ITER relevant ELM energy drop have been used to estimate the impact energy of deuterium ions on the divertor target. This analysis gives an ion energy of several keV during ELMs, which makes D+ responsible for most of the W sputtering in unseeded H-mode discharges. Although at first sight surprising, it's consistent with the‘Free-Streaming’ kinetic model.
Permanent Link: http://hdl.handle.net/11104/0254593