ERO modelling of tungsten erosion and re-deposition in EAST L mode discharges

H. Xie; R. Ding; A. Kirschner; J. L. Chen; F. Ding; H. M. Mao; W. Feng; D. Borodin; L. Wang

doi:10.1063/1.4991457

ERO modelling of tungsten erosion and re-deposition in EAST L mode discharges

H. Xie, R. Ding, A. Kirschner, J. L. Chen, F. Ding, H. M. Mao, W. Feng, D. Borodin, L. Wang

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

23 Scopus citations

Abstract

Tungsten erosion and re-deposition at the upper outer divertor of the Experimental Advanced Superconducting Tokamak has been modelled using the 3D Monte Carlo code ERO. The measured divertor plasma condition in attached L mode discharges with upper single null configuration has been used to build the background plasma in the simulations. The tungsten gross erosion rate is mainly determined by carbon impurity in the background plasma. Increasing carbon concentration can first increase and afterwards suppress the tungsten erosion rate. Taking into account the material mixing surface model, the influence of eroded particles returning to the surface on sputtering has been studied. Sputtering by eroded particles returning to the surface can significantly enhance the gross erosion by reduction of the carbon ratio within the surface interaction layer and by increasing the erosion rate due to sputtering by both eroded tungsten and carbon particles. Modelling indicates that carbon deposition occurs on the dome plate and part of the vertical plate close to the dome plate, whereas tungsten net erosion occurs on most of the vertical plate. The modelling results are in reasonable agreement with the experimental WI spectroscopy.

Original language	English
Article number	092512
Journal	Physics of Plasmas
Volume	24
Issue number	9
DOIs	https://doi.org/10.1063/1.4991457
State	Published - 1 Sep 2017
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2017 Author(s).

Funding

This work has been supported by the National Magnetic Confinement Fusion Science Program of China (Grant Nos. 2013GB107004 and 2013GB105003), the National Natural Science Foundation of China (Grant Nos. 11375010, 11675218, and 11575243), and the Sino-German Center for Research Promotion under Contract No. GZ769.

Funders	Funder number
National Natural Science Foundation of China	11575243, 11675218, 11375010
Chinesisch-Deutsche Zentrum für Wissenschaftsförderung	GZ769
National Magnetic Confinement Fusion Program of China	2013GB105003, 2013GB107004

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title = "ERO modelling of tungsten erosion and re-deposition in EAST L mode discharges",

abstract = "Tungsten erosion and re-deposition at the upper outer divertor of the Experimental Advanced Superconducting Tokamak has been modelled using the 3D Monte Carlo code ERO. The measured divertor plasma condition in attached L mode discharges with upper single null configuration has been used to build the background plasma in the simulations. The tungsten gross erosion rate is mainly determined by carbon impurity in the background plasma. Increasing carbon concentration can first increase and afterwards suppress the tungsten erosion rate. Taking into account the material mixing surface model, the influence of eroded particles returning to the surface on sputtering has been studied. Sputtering by eroded particles returning to the surface can significantly enhance the gross erosion by reduction of the carbon ratio within the surface interaction layer and by increasing the erosion rate due to sputtering by both eroded tungsten and carbon particles. Modelling indicates that carbon deposition occurs on the dome plate and part of the vertical plate close to the dome plate, whereas tungsten net erosion occurs on most of the vertical plate. The modelling results are in reasonable agreement with the experimental WI spectroscopy.",

author = "H. Xie and R. Ding and A. Kirschner and Chen, {J. L.} and F. Ding and Mao, {H. M.} and W. Feng and D. Borodin and L. Wang",

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T1 - ERO modelling of tungsten erosion and re-deposition in EAST L mode discharges

AU - Xie, H.

AU - Ding, R.

AU - Kirschner, A.

AU - Chen, J. L.

AU - Ding, F.

AU - Mao, H. M.

AU - Feng, W.

AU - Borodin, D.

AU - Wang, L.

PY - 2017/9/1

Y1 - 2017/9/1

N2 - Tungsten erosion and re-deposition at the upper outer divertor of the Experimental Advanced Superconducting Tokamak has been modelled using the 3D Monte Carlo code ERO. The measured divertor plasma condition in attached L mode discharges with upper single null configuration has been used to build the background plasma in the simulations. The tungsten gross erosion rate is mainly determined by carbon impurity in the background plasma. Increasing carbon concentration can first increase and afterwards suppress the tungsten erosion rate. Taking into account the material mixing surface model, the influence of eroded particles returning to the surface on sputtering has been studied. Sputtering by eroded particles returning to the surface can significantly enhance the gross erosion by reduction of the carbon ratio within the surface interaction layer and by increasing the erosion rate due to sputtering by both eroded tungsten and carbon particles. Modelling indicates that carbon deposition occurs on the dome plate and part of the vertical plate close to the dome plate, whereas tungsten net erosion occurs on most of the vertical plate. The modelling results are in reasonable agreement with the experimental WI spectroscopy.

AB - Tungsten erosion and re-deposition at the upper outer divertor of the Experimental Advanced Superconducting Tokamak has been modelled using the 3D Monte Carlo code ERO. The measured divertor plasma condition in attached L mode discharges with upper single null configuration has been used to build the background plasma in the simulations. The tungsten gross erosion rate is mainly determined by carbon impurity in the background plasma. Increasing carbon concentration can first increase and afterwards suppress the tungsten erosion rate. Taking into account the material mixing surface model, the influence of eroded particles returning to the surface on sputtering has been studied. Sputtering by eroded particles returning to the surface can significantly enhance the gross erosion by reduction of the carbon ratio within the surface interaction layer and by increasing the erosion rate due to sputtering by both eroded tungsten and carbon particles. Modelling indicates that carbon deposition occurs on the dome plate and part of the vertical plate close to the dome plate, whereas tungsten net erosion occurs on most of the vertical plate. The modelling results are in reasonable agreement with the experimental WI spectroscopy.

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ERO modelling of tungsten erosion and re-deposition in EAST L mode discharges

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