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

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 emi...

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Main Authors:	M. Shoji, G. Kawamura, R. Smirnov, A. Pigarov, Y. Tanaka, S. Masuzaki, Y. Uesugi
Format:	Article
Language:	English
Published:	Elsevier 2017-08-01
Series:	Nuclear Materials and Energy
Online Access:	http://www.sciencedirect.com/science/article/pii/S2352179116300485

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spelling	doaj-12fe64d035da4f6daf4c4f6a29075e312020-11-24T21:30:03ZengElsevierNuclear Materials and Energy2352-17912017-08-0112779785Simulation of impurity transport in the peripheral plasma due to the emission of dust in long pulse discharges on the Large Helical DeviceM. Shoji0G. Kawamura1R. Smirnov2A. Pigarov3Y. Tanaka4S. Masuzaki5Y. Uesugi6National Institute for Fusion Science, National Institutes of Natural Sciences 322-6 Oroshi-cho, Toki 509-5292, Japan; Corresponding author.National Institute for Fusion Science, National Institutes of Natural Sciences 322-6 Oroshi-cho, Toki 509-5292, JapanDepartment of Mechanical and Aerospace Engineering, University of California at San Diego, La Jolla, CA 92093, USADepartment of Mechanical and Aerospace Engineering, University of California at San Diego, La Jolla, CA 92093, USADivision of Electrical Engineering and Computer Science, Kanazawa University, Kakuma, Kanazawa 920-1192, JapanNational Institute for Fusion Science, National Institutes of Natural Sciences 322-6 Oroshi-cho, Toki 509-5292, JapanDivision of Electrical Engineering and Computer Science, Kanazawa University, Kakuma, Kanazawa 920-1192, JapanTwo 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 dischargehttp://www.sciencedirect.com/science/article/pii/S2352179116300485
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	M. Shoji G. Kawamura R. Smirnov A. Pigarov Y. Tanaka S. Masuzaki Y. Uesugi
spellingShingle	M. Shoji G. Kawamura R. Smirnov A. Pigarov Y. Tanaka S. Masuzaki Y. Uesugi Simulation of impurity transport in the peripheral plasma due to the emission of dust in long pulse discharges on the Large Helical Device Nuclear Materials and Energy
author_facet	M. Shoji G. Kawamura R. Smirnov A. Pigarov Y. Tanaka S. Masuzaki Y. Uesugi
author_sort	M. Shoji
title	Simulation of impurity transport in the peripheral plasma due to the emission of dust in long pulse discharges on the Large Helical Device
title_short	Simulation of impurity transport in the peripheral plasma due to the emission of dust in long pulse discharges on the Large Helical Device
title_full	Simulation of impurity transport in the peripheral plasma due to the emission of dust in long pulse discharges on the Large Helical Device
title_fullStr	Simulation of impurity transport in the peripheral plasma due to the emission of dust in long pulse discharges on the Large Helical Device
title_full_unstemmed	Simulation of impurity transport in the peripheral plasma due to the emission of dust in long pulse discharges on the Large Helical Device
title_sort	simulation of impurity transport in the peripheral plasma due to the emission of dust in long pulse discharges on the large helical device
publisher	Elsevier
series	Nuclear Materials and Energy
issn	2352-1791
publishDate	2017-08-01
description	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
url	http://www.sciencedirect.com/science/article/pii/S2352179116300485
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Simulation of impurity transport in the peripheral plasma due to the emission of dust in long pulse discharges on the Large Helical Device

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