Effect of thermoelectric current splitting on the magnetic topology in DIII-D

A. Wingen; T. E. Evans; K. H. Spatschek

doi:10.1063/1.3571600

Effect of thermoelectric current splitting on the magnetic topology in DIII-D

A. Wingen, T. E. Evans, K. H. Spatschek

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

6 Scopus citations

Abstract

An extended model is proposed to describe the magnetic topology during appearance of edge localized modes (ELMs). It is applied to an ELMing H-mode in a lower single null discharge at DIII-D [J. L. Luxon, Nucl. Fusion 42, 614 (2002)]. The process of flux tube formation is discussed based on a previously proposed two-step model. Large currents, as found in measurements in DIII-D, are assumed running through newly formed large flux tubes. Two different realizations of the current distribution within the tubes are compared, namely a single filament in each tube and a scenario where the current in each tube is split into subfilaments. The latter scenario is shown to be the more realistic distribution because it leads to much better agreement with infrared camera observations. It is demonstrated that stripe patterns in the divertor heat flux produced by an ELM in the DIII-D tokamak can be reproduced numerically by taking into account the magnetic perturbation caused by the thermoelectric current subfilaments.

Original language	English
Article number	042501
Journal	Physics of Plasmas
Volume	18
Issue number	4
DOIs	https://doi.org/10.1063/1.3571600
State	Published - Apr 2011
Externally published	Yes

Funding

This work was supported by the U.S. Department of Energy under DE-FC02-04ER54698, DE-AC52-07NA27344, and DE-FG02-05ER54809, as well as the DFG under project SP229/1-1. Discussions with R. A. Moyer and O. Schmitz are gratefully acknowledged.

Funders	Funder number
U.S. Department of Energy	DE-FG02-05ER54809, DE-FC02-04ER54698, DE-AC52-07NA27344
Deutsche Forschungsgemeinschaft	SP229/1-1

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

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10.1063/1.3571600

Cite this

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abstract = "An extended model is proposed to describe the magnetic topology during appearance of edge localized modes (ELMs). It is applied to an ELMing H-mode in a lower single null discharge at DIII-D [J. L. Luxon, Nucl. Fusion 42, 614 (2002)]. The process of flux tube formation is discussed based on a previously proposed two-step model. Large currents, as found in measurements in DIII-D, are assumed running through newly formed large flux tubes. Two different realizations of the current distribution within the tubes are compared, namely a single filament in each tube and a scenario where the current in each tube is split into subfilaments. The latter scenario is shown to be the more realistic distribution because it leads to much better agreement with infrared camera observations. It is demonstrated that stripe patterns in the divertor heat flux produced by an ELM in the DIII-D tokamak can be reproduced numerically by taking into account the magnetic perturbation caused by the thermoelectric current subfilaments.",

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AU - Evans, T. E.

AU - Spatschek, K. H.

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AB - An extended model is proposed to describe the magnetic topology during appearance of edge localized modes (ELMs). It is applied to an ELMing H-mode in a lower single null discharge at DIII-D [J. L. Luxon, Nucl. Fusion 42, 614 (2002)]. The process of flux tube formation is discussed based on a previously proposed two-step model. Large currents, as found in measurements in DIII-D, are assumed running through newly formed large flux tubes. Two different realizations of the current distribution within the tubes are compared, namely a single filament in each tube and a scenario where the current in each tube is split into subfilaments. The latter scenario is shown to be the more realistic distribution because it leads to much better agreement with infrared camera observations. It is demonstrated that stripe patterns in the divertor heat flux produced by an ELM in the DIII-D tokamak can be reproduced numerically by taking into account the magnetic perturbation caused by the thermoelectric current subfilaments.

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Effect of thermoelectric current splitting on the magnetic topology in DIII-D

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