Surface roughness effect on Mo physical sputtering and re-deposition in the linear plasma device PSI-2 predicted by ERO2.0

A. Eksaeva; D. Borodin; J. Romazanov; A. Kirschner; A. Kreter; M. Eichler; M. Rasinski; A. Pospieszczyk; B. Unterberg; S. Brezinsek; Ch Linsmeier; D. Tskhakaya; I. Borodkina; M. Komm

doi:10.1016/j.nme.2019.02.006

Surface roughness effect on Mo physical sputtering and re-deposition in the linear plasma device PSI-2 predicted by ERO2.0

A. Eksaeva, D. Borodin, J. Romazanov, A. Kirschner, A. Kreter, M. Eichler, M. Rasinski, A. Pospieszczyk, B. Unterberg, S. Brezinsek, Ch Linsmeier, D. Tskhakaya, I. Borodkina, M. Komm

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Abstract

Surface morphology and its evolution during the plasma irradiation is known to have a large influence on the erosion and resulting lifetime of plasma-facing components as well as tritium retention. For instance, surface roughness can affect physical sputtering, re-deposition, as well as angular distributions of the sputtered species. In this study the effect of surface roughness is implemented into the 3D Monte-Carlo code ERO2.0. First modelling results for molybdenum (Mo) irradiated with deuterium (D) in the conditions foreseen for the planned experiments at the linear plasma device PSI-2 are presented. Using the constructed examples of surfaces with various (regular and fractal) roughness types it is shown that the effective sputtering yield decreases for rough surfaces in comparison to smooth ones. The angular distribution of particles escaping from the rough surface collimates with the increase of the surface structure's aspect ratio. Moreover, the modelling predicts flattening of the surface during the plasma irradiation due to the preferable re-deposition in the “valleys” and sputtering of the peak tops.

Original language	English
Pages (from-to)	13-18
Number of pages	6
Journal	Nuclear Materials and Energy
Volume	19
DOIs	https://doi.org/10.1016/j.nme.2019.02.006
State	Published - May 2019
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2019

Funding

This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 under grant agreement no 633053 . This work was supported by Czech Science Foundation project GA16-14228S and by the IT4Innovations Centre of Excellence project ( CZ.1.05/1.1.00/02.0070 ). The views and opinions expressed herein do not necessarily reflect those of the European Commission . The authors gratefully acknowledge the computing time granted through JARA-HPC on the supercomputer JUQUEEN at Forschungszentrum Jülich. This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 under grant agreement no 633053. This work was supported by Czech Science Foundation project GA16-14228S and by the IT4Innovations Centre of Excellence project (CZ.1.05/1.1.00/02.0070). The views and opinions expressed herein do not necessarily reflect those of the European Commission. The authors gratefully acknowledge the computing time granted through JARA-HPC on the supercomputer JUQUEEN at Forschungszentrum Jülich.

Funders	Funder number
Euratom research and training programme 2014–2018
IT4Innovations Centre of Excellence	CZ.1.05/1.1.00/02.0070
Horizon 2020 Framework Programme	633053
H2020 Euratom
Grantová Agentura České Republiky	GA16-14228S

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Eksaeva, A., Borodin, D., Romazanov, J., Kirschner, A., Kreter, A., Eichler, M., Rasinski, M., Pospieszczyk, A., Unterberg, B., Brezinsek, S., Linsmeier, C., Tskhakaya, D., Borodkina, I., & Komm, M. (2019). Surface roughness effect on Mo physical sputtering and re-deposition in the linear plasma device PSI-2 predicted by ERO2.0. Nuclear Materials and Energy, 19, 13-18. https://doi.org/10.1016/j.nme.2019.02.006

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title = "Surface roughness effect on Mo physical sputtering and re-deposition in the linear plasma device PSI-2 predicted by ERO2.0",

abstract = "Surface morphology and its evolution during the plasma irradiation is known to have a large influence on the erosion and resulting lifetime of plasma-facing components as well as tritium retention. For instance, surface roughness can affect physical sputtering, re-deposition, as well as angular distributions of the sputtered species. In this study the effect of surface roughness is implemented into the 3D Monte-Carlo code ERO2.0. First modelling results for molybdenum (Mo) irradiated with deuterium (D) in the conditions foreseen for the planned experiments at the linear plasma device PSI-2 are presented. Using the constructed examples of surfaces with various (regular and fractal) roughness types it is shown that the effective sputtering yield decreases for rough surfaces in comparison to smooth ones. The angular distribution of particles escaping from the rough surface collimates with the increase of the surface structure's aspect ratio. Moreover, the modelling predicts flattening of the surface during the plasma irradiation due to the preferable re-deposition in the “valleys” and sputtering of the peak tops.",

author = "A. Eksaeva and D. Borodin and J. Romazanov and A. Kirschner and A. Kreter and M. Eichler and M. Rasinski and A. Pospieszczyk and B. Unterberg and S. Brezinsek and Ch Linsmeier and D. Tskhakaya and I. Borodkina and M. Komm",

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doi = "10.1016/j.nme.2019.02.006",

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Eksaeva, A, Borodin, D, Romazanov, J, Kirschner, A, Kreter, A, Eichler, M, Rasinski, M, Pospieszczyk, A, Unterberg, B, Brezinsek, S, Linsmeier, C, Tskhakaya, D, Borodkina, I & Komm, M 2019, 'Surface roughness effect on Mo physical sputtering and re-deposition in the linear plasma device PSI-2 predicted by ERO2.0', Nuclear Materials and Energy, vol. 19, pp. 13-18. https://doi.org/10.1016/j.nme.2019.02.006

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AU - Eksaeva, A.

AU - Borodin, D.

AU - Romazanov, J.

AU - Kirschner, A.

AU - Kreter, A.

AU - Eichler, M.

AU - Rasinski, M.

AU - Pospieszczyk, A.

AU - Unterberg, B.

AU - Brezinsek, S.

AU - Linsmeier, Ch

AU - Tskhakaya, D.

AU - Borodkina, I.

AU - Komm, M.

PY - 2019/5

Y1 - 2019/5

N2 - Surface morphology and its evolution during the plasma irradiation is known to have a large influence on the erosion and resulting lifetime of plasma-facing components as well as tritium retention. For instance, surface roughness can affect physical sputtering, re-deposition, as well as angular distributions of the sputtered species. In this study the effect of surface roughness is implemented into the 3D Monte-Carlo code ERO2.0. First modelling results for molybdenum (Mo) irradiated with deuterium (D) in the conditions foreseen for the planned experiments at the linear plasma device PSI-2 are presented. Using the constructed examples of surfaces with various (regular and fractal) roughness types it is shown that the effective sputtering yield decreases for rough surfaces in comparison to smooth ones. The angular distribution of particles escaping from the rough surface collimates with the increase of the surface structure's aspect ratio. Moreover, the modelling predicts flattening of the surface during the plasma irradiation due to the preferable re-deposition in the “valleys” and sputtering of the peak tops.

AB - Surface morphology and its evolution during the plasma irradiation is known to have a large influence on the erosion and resulting lifetime of plasma-facing components as well as tritium retention. For instance, surface roughness can affect physical sputtering, re-deposition, as well as angular distributions of the sputtered species. In this study the effect of surface roughness is implemented into the 3D Monte-Carlo code ERO2.0. First modelling results for molybdenum (Mo) irradiated with deuterium (D) in the conditions foreseen for the planned experiments at the linear plasma device PSI-2 are presented. Using the constructed examples of surfaces with various (regular and fractal) roughness types it is shown that the effective sputtering yield decreases for rough surfaces in comparison to smooth ones. The angular distribution of particles escaping from the rough surface collimates with the increase of the surface structure's aspect ratio. Moreover, the modelling predicts flattening of the surface during the plasma irradiation due to the preferable re-deposition in the “valleys” and sputtering of the peak tops.

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Surface roughness effect on Mo physical sputtering and re-deposition in the linear plasma device PSI-2 predicted by ERO2.0

Abstract

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