Study of DIII-D tungsten erosion processes by using a carbon–tungsten mixed material model

G. L. Xu; J. Guterl; T. Abrams; H. Q. Wang; P. F. Zhang; J. D. Elder; E. A. Unterberg; D. M. Thomas; H. Y. Guo; M. Y. Ye

doi:10.1016/j.nme.2018.12.020

Study of DIII-D tungsten erosion processes by using a carbon–tungsten mixed material model

G. L. Xu, J. Guterl, T. Abrams, H. Q. Wang, P. F. Zhang, J. D. Elder, E. A. Unterberg, D. M. Thomas, H. Y. Guo, M. Y. Ye

Power Exhaust and Particle Control

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

7 Scopus citations

Abstract

The tungsten erosion process for an H-mode discharge from the DIII-D Metal Rings Campaign is modeled using OEDGE and TRIM.SP. The OEDGE code is employed to calculate tungsten erosion between edge-localized modes (ELMs). Then a newly developed semi-analytical carbon–tungsten mixed material model based on TRIM.SP is used to simulate the intra-ELM tungsten gross erosion profiles. The tungsten erosion is found to be dominated by carbon, with different origin for carbon between ELMs and during ELMs. For inter-ELM, the tungsten is mainly eroded by locally redeposited low charge state carbon, while for intra-ELM, the C⁶⁺ originated from the pedestal region is found to dominate the tungsten erosion in the near separatrix region, whereas the locally redeposited low charge state C fluxes lead to a nonnegligible tungsten erosion in the outer SOL region. These results suggest that modeling of W erosion during ELMs needs to include impurity transport from the pedestal to the divertor during an ELM. In addition, for both inter- and intra-ELM simulation, a carbon coverage of 30% on the tungsten surface is needed to reproduce the measured erosion at the divertor target.

Original language	English
Pages (from-to)	141-146
Number of pages	6
Journal	Nuclear Materials and Energy
Volume	18
DOIs	https://doi.org/10.1016/j.nme.2018.12.020
State	Published - Jan 2019

Bibliographical note

Publisher Copyright:
© 2018 The Authors

Funding

The authors would like to thank M. Knolker for the help of handling IR camera data. We are grateful to P.C. Stangeby and I. Bykov for helpful discussions. Most of all, the first author would like to give special thanks to Miss Wenjie Hu for her love and support throughout the years they were separated by the Pacific Ocean. The work was performed under the auspices of the CSC (No.201506340019) and U.S. DOE (DE-FC02-04ER54698).

Funders	Funder number
U.S. Department of Energy	DE-FC02-04ER54698
China Scholarship Council	201506340019

Keywords

Carbon
Erosion
Plasma material interaction
Tungsten

UN SDGs

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

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10.1016/j.nme.2018.12.020

Cite this

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title = "Study of DIII-D tungsten erosion processes by using a carbon–tungsten mixed material model",

abstract = "The tungsten erosion process for an H-mode discharge from the DIII-D Metal Rings Campaign is modeled using OEDGE and TRIM.SP. The OEDGE code is employed to calculate tungsten erosion between edge-localized modes (ELMs). Then a newly developed semi-analytical carbon–tungsten mixed material model based on TRIM.SP is used to simulate the intra-ELM tungsten gross erosion profiles. The tungsten erosion is found to be dominated by carbon, with different origin for carbon between ELMs and during ELMs. For inter-ELM, the tungsten is mainly eroded by locally redeposited low charge state carbon, while for intra-ELM, the C6+ originated from the pedestal region is found to dominate the tungsten erosion in the near separatrix region, whereas the locally redeposited low charge state C fluxes lead to a nonnegligible tungsten erosion in the outer SOL region. These results suggest that modeling of W erosion during ELMs needs to include impurity transport from the pedestal to the divertor during an ELM. In addition, for both inter- and intra-ELM simulation, a carbon coverage of 30% on the tungsten surface is needed to reproduce the measured erosion at the divertor target.",

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author = "Xu, {G. L.} and J. Guterl and T. Abrams and Wang, {H. Q.} and Zhang, {P. F.} and Elder, {J. D.} and Unterberg, {E. A.} and Thomas, {D. M.} and Guo, {H. Y.} and Ye, {M. Y.}",

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doi = "10.1016/j.nme.2018.12.020",

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AU - Xu, G. L.

AU - Guterl, J.

AU - Abrams, T.

AU - Wang, H. Q.

AU - Zhang, P. F.

AU - Elder, J. D.

AU - Unterberg, E. A.

AU - Thomas, D. M.

AU - Guo, H. Y.

AU - Ye, M. Y.

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N2 - The tungsten erosion process for an H-mode discharge from the DIII-D Metal Rings Campaign is modeled using OEDGE and TRIM.SP. The OEDGE code is employed to calculate tungsten erosion between edge-localized modes (ELMs). Then a newly developed semi-analytical carbon–tungsten mixed material model based on TRIM.SP is used to simulate the intra-ELM tungsten gross erosion profiles. The tungsten erosion is found to be dominated by carbon, with different origin for carbon between ELMs and during ELMs. For inter-ELM, the tungsten is mainly eroded by locally redeposited low charge state carbon, while for intra-ELM, the C6+ originated from the pedestal region is found to dominate the tungsten erosion in the near separatrix region, whereas the locally redeposited low charge state C fluxes lead to a nonnegligible tungsten erosion in the outer SOL region. These results suggest that modeling of W erosion during ELMs needs to include impurity transport from the pedestal to the divertor during an ELM. In addition, for both inter- and intra-ELM simulation, a carbon coverage of 30% on the tungsten surface is needed to reproduce the measured erosion at the divertor target.

AB - The tungsten erosion process for an H-mode discharge from the DIII-D Metal Rings Campaign is modeled using OEDGE and TRIM.SP. The OEDGE code is employed to calculate tungsten erosion between edge-localized modes (ELMs). Then a newly developed semi-analytical carbon–tungsten mixed material model based on TRIM.SP is used to simulate the intra-ELM tungsten gross erosion profiles. The tungsten erosion is found to be dominated by carbon, with different origin for carbon between ELMs and during ELMs. For inter-ELM, the tungsten is mainly eroded by locally redeposited low charge state carbon, while for intra-ELM, the C6+ originated from the pedestal region is found to dominate the tungsten erosion in the near separatrix region, whereas the locally redeposited low charge state C fluxes lead to a nonnegligible tungsten erosion in the outer SOL region. These results suggest that modeling of W erosion during ELMs needs to include impurity transport from the pedestal to the divertor during an ELM. In addition, for both inter- and intra-ELM simulation, a carbon coverage of 30% on the tungsten surface is needed to reproduce the measured erosion at the divertor target.

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KW - Plasma material interaction

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ER -

Study of DIII-D tungsten erosion processes by using a carbon–tungsten mixed material model

Abstract

Bibliographical note

Funding

Keywords

UN SDGs

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