Plasma and Fusion Research

Volume 13, 3403034 (2018)

Regular Articles

Application of EMC3-EIRENE to Estimation of Influence of a Liquid Metal Limiter on an LHD-Type Fusion Plasma
Gakushi KAWAMURA1,2), Junichi MIYAZAWA1,2), Takuya GOTO1,2), Mamoru SHOJI1), Suguru MASUZAKI1,2), Yasuhiro SUZUKI1,2) and Yuhe FENG3)
1)
National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
2)
Department of Fusion Science, Graduate University for Advanced Studies (SOKENDAI), Toki 509-5292, Japan
3)
Max-Planck-Institut für Plasmaphysik, D-17491 Greifswald, Germany
(Received 28 December 2017 / Accepted 25 March 2018 / Published 24 April 2018)

Abstract

Recently, a new limiter concept with liquid metal for a helical fusion reactor was proposed. This work present a modeling study to understand the influence of the limiter to the plasma and to find critical parameters for the liquid limiter concept. EMC3-EIRENE code is applied to a limiter configuration of a vertical column formed with plane surfaces at the inboard side of the Large Helical Device (LHD). The calculation results indicate that heat load on the helical divertor plates is significantly reduced when the limiter is inserted into the ergodic layer even without impurities. However, the influence of impurity radiation is too large in some cases. In order to achieve a large reduction of divertor flux and to avoid a large reduction of core electron temperature, parameter scans with limiter position and sputtering yield were performed. The results suggest that the limiter position is a critical parameter for acceptable degradation of the core and sufficient reduction of divertor flux.

Keywords

EMC3-EIRENE, modeling, liquid metal, limiter, divertor

DOI: 10.1585/pfr.13.3403034

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