Type I ELM filament heat fluxes on the KSTAR main chamber wall

Collection with item attached
2017
Item details URL
http://open-repository.kisti.re.kr/cube/handle/open_repository/486617.do
DOI
10.1016/j.nme.2017.04.006
Title
Type I ELM filament heat fluxes on the KSTAR main chamber wall
Description
This research was supported by National R&D Program through the NationalResearch Foundation of Korea (NRF) funded by the Ministry of Science,ICT & Future Planning (2015M1A7A1A01002784), and was partly supported byKSTAR project and National Research Council of Science and Technology(NST) under the international collaboration & research in Asiancountries (PG-1314).
abstract
Heat loads deposited on the first wall by mitigated Type I ELMs are expected to be the dominant contributor to the total thermal plasma wall load of the International Thermonuclear Experimental Reactor (ITER), particularly in the upper main chamber regions during the baseline H-mode magnetic equilibrium, due to the fast radial convective heat propagation of ELM filaments before complete loss to the divertor. Specific Type I ELMing H-mode discharges have been performed with a lower single null magnetic geometry, where the outboard separatrix position is slowly (similar to 7 s) scanned over a radial distance of 7 cm, reducing the wall probe-separatrix distance to a minimum of similar to 9 cm, and allowing the ELM filament heat loss to the wall to be analyzed as a function of radial propagation distance. A fast reciprocating probe (FRP) head is separately held at fixed position toroidally close and 4.7 cm radially in front of the wall probe. This FRP monitors the ELM ion fluxes, allowing an average filament radial propagation speed, found to be independent of ELM energy, of 80-100 ms(-1) to be extracted. Radial dependence of the peak filament wall parallel heat flux is observed to be exponential, with the decay length of lambda(q,ELM) similar to 25 +/- 4 mm and with the heat flux of q(parallel to,ELM) = 0.05 MWm(-2) at the wall, corresponding to q(parallel to) similar to 7.5 MWm(-2) at the second separatrix. Along with the measured radial propagation speed and the calculated radial profile of the magnetic connection lengths across the SOL, these data could be utilized to analyze filament energy loss model for the future machines. (C) 2017 The Authors. Published by Elsevier Ltd.
provenance
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language
English
author
Bae, M. -K.
Pitts, R. A.
Bak, J. G.
Hong, S. -H.
Kim, H. S.
Lee, H. H.
Kang, I. J.
Chung, K. -S.
accessioned
2018-09-28T16:12:24Z
available
2018-09-28T16:12:24Z
issued
2017
citation
NUCLEAR MATERIALS AND ENERGY(12)
issn
2352-1791
uri
http://open-repository.kisti.re.kr/cube/handle/open_repository/486617.do
Funder
교육부
Funding Program
BK21플러스사업(0.5)
Project ID
1345274232
Jurisdiction
Rep.of Korea
Project Name
Eco-friendly Technology of Electrical Energy Conversion and Management
rights
openAccess
type
article


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