Simulation of impurity transport in the peripheral plasma due to the emission of dust in long pulse discharges on the Large Helical Device

M. Shoji; G. Kawamura; R. Smirnov; A. Pigarov; Y. Tanaka; S. Masuzaki; Y. Uesugi

Nuclear Materials and Energy (Aug 2017)

Simulation of impurity transport in the peripheral plasma due to the emission of dust in long pulse discharges on the Large Helical Device

M. Shoji,
G. Kawamura,
R. Smirnov,
A. Pigarov,
Y. Tanaka,
S. Masuzaki,
Y. Uesugi

Affiliations

M. Shoji: National Institute for Fusion Science, National Institutes of Natural Sciences 322-6 Oroshi-cho, Toki 509-5292, Japan; Corresponding author.
G. Kawamura: National Institute for Fusion Science, National Institutes of Natural Sciences 322-6 Oroshi-cho, Toki 509-5292, Japan
R. Smirnov: Department of Mechanical and Aerospace Engineering, University of California at San Diego, La Jolla, CA 92093, USA
A. Pigarov: Department of Mechanical and Aerospace Engineering, University of California at San Diego, La Jolla, CA 92093, USA
Y. Tanaka: Division of Electrical Engineering and Computer Science, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
S. Masuzaki: National Institute for Fusion Science, National Institutes of Natural Sciences 322-6 Oroshi-cho, Toki 509-5292, Japan
Y. Uesugi: Division of Electrical Engineering and Computer Science, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan

Journal volume & issue: Vol. 12
pp. 779 – 785

Abstract

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Two different plasma termination processes by dust emission were observed in long pulse discharges in the Large Helical Device. One is a plasma termination caused by large amounts of carbon dust released from a lower divertor region. The other is termination caused by stainless steel (iron) dust emission from the surface of a helical coil can. The effect of the dust emission on the sustainment of the long pulse discharges are investigated using a three-dimensional edge plasma transport code (EMC3-EIRENE) coupled with a dust transport code (DUSTT). The simulation shows that the plasma is more influenced by the iron dust emission from the helical coil can than by the carbon dust emission from the divertor region. The simulation revealed that the plasma flow in divertor legs is quite effective for preventing dust from terminating the long pulse discharges. Keywords: Dust, EMC3-EIRENE, DUSTT, Long pulse discharge

Published in Nuclear Materials and Energy

ISSN: 2352-1791 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Nuclear engineering. Atomic power
Website: http://www.journals.elsevier.com/nuclear-materials-and-energy/

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