Deposition of 13C tracer and impurity elements on the divertor of Wendelstein 7-X

Tomi Vuoriheimo; Antti Hakola; Jari Likonen; Sebastijan Brezinsek; Timo Dittmar; Matej Mayer; Chandra Prakash Dhard; Dirk Naujoks; Filip Tuomisto

doi:10.1088/1402-4896/ac2381

Deposition of 13C tracer and impurity elements on the divertor of Wendelstein 7-X

Tomi Vuoriheimo^* (Corresponding Author), Antti Hakola, Jari Likonen, Sebastijan Brezinsek, Timo Dittmar, Matej Mayer, Chandra Prakash Dhard, Dirk Naujoks, Filip Tuomisto

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

2 Citations (Scopus)

Abstract

Carbon impurity transport and deposition were investigated in the Wendelstein 7-X stellarator by injecting isotopically labelled methane (13CH4) into the edge plasma during the last plasma operations of its Operational Phase (OP) 1.2B experimental campaign. 13C deposition was measured by secondary ion mass spectrometry (SIMS) on three upper divertor tiles located on the opposite side of the vessel to the13CH4 inlet. The highest 13C inventories were found as stripe-like patterns on both sides of the different strike lines. These high deposition areas were also analysed for their impurity contents and the depth profiles of the main elements in the layers. Layered deposition of different impurity elements such as Cr, Ni, Mo and B was found to reflect various events such as high metallic impurities during the OP1.2A and three boronizations carried out during OP1.2B.

Original language	English
Article number	124023
Journal	Physica Scripta
Volume	96
Issue number	12
DOIs	https://doi.org/10.1088/1402-4896/ac2381
Publication status	Published - Dec 2021
MoE publication type	A1 Journal article-refereed

Keywords

carbon
deposition
impurity
wendelstein 7-X

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1088/1402-4896/ac2381

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title = "Deposition of 13C tracer and impurity elements on the divertor of Wendelstein 7-X",

abstract = "Carbon impurity transport and deposition were investigated in the Wendelstein 7-X stellarator by injecting isotopically labelled methane (13CH4) into the edge plasma during the last plasma operations of its Operational Phase (OP) 1.2B experimental campaign. 13C deposition was measured by secondary ion mass spectrometry (SIMS) on three upper divertor tiles located on the opposite side of the vessel to the13CH4 inlet. The highest 13C inventories were found as stripe-like patterns on both sides of the different strike lines. These high deposition areas were also analysed for their impurity contents and the depth profiles of the main elements in the layers. Layered deposition of different impurity elements such as Cr, Ni, Mo and B was found to reflect various events such as high metallic impurities during the OP1.2A and three boronizations carried out during OP1.2B.",

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author = "Tomi Vuoriheimo and Antti Hakola and Jari Likonen and Sebastijan Brezinsek and Timo Dittmar and Matej Mayer and {Prakash Dhard}, Chandra and Dirk Naujoks and Filip Tuomisto",

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T1 - Deposition of 13C tracer and impurity elements on the divertor of Wendelstein 7-X

AU - Vuoriheimo, Tomi

AU - Hakola, Antti

AU - Likonen, Jari

AU - Brezinsek, Sebastijan

AU - Dittmar, Timo

AU - Mayer, Matej

AU - Prakash Dhard, Chandra

AU - Naujoks, Dirk

AU - Tuomisto, Filip

PY - 2021/12

Y1 - 2021/12

N2 - Carbon impurity transport and deposition were investigated in the Wendelstein 7-X stellarator by injecting isotopically labelled methane (13CH4) into the edge plasma during the last plasma operations of its Operational Phase (OP) 1.2B experimental campaign. 13C deposition was measured by secondary ion mass spectrometry (SIMS) on three upper divertor tiles located on the opposite side of the vessel to the13CH4 inlet. The highest 13C inventories were found as stripe-like patterns on both sides of the different strike lines. These high deposition areas were also analysed for their impurity contents and the depth profiles of the main elements in the layers. Layered deposition of different impurity elements such as Cr, Ni, Mo and B was found to reflect various events such as high metallic impurities during the OP1.2A and three boronizations carried out during OP1.2B.

AB - Carbon impurity transport and deposition were investigated in the Wendelstein 7-X stellarator by injecting isotopically labelled methane (13CH4) into the edge plasma during the last plasma operations of its Operational Phase (OP) 1.2B experimental campaign. 13C deposition was measured by secondary ion mass spectrometry (SIMS) on three upper divertor tiles located on the opposite side of the vessel to the13CH4 inlet. The highest 13C inventories were found as stripe-like patterns on both sides of the different strike lines. These high deposition areas were also analysed for their impurity contents and the depth profiles of the main elements in the layers. Layered deposition of different impurity elements such as Cr, Ni, Mo and B was found to reflect various events such as high metallic impurities during the OP1.2A and three boronizations carried out during OP1.2B.

KW - carbon

KW - deposition

KW - impurity

KW - wendelstein 7-X

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DO - 10.1088/1402-4896/ac2381

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SN - 0031-8949

VL - 96

JO - Physica Scripta

JF - Physica Scripta

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M1 - 124023

ER -

Deposition of 13C tracer and impurity elements on the divertor of Wendelstein 7-X

Abstract

Keywords

UN SDGs

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