ERO and PIC simulations of gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade

Antti Hakola; Markus I. Airila; Nicolas Mellet; M. Groth; J. Karhunen; T. Kurki-Suonio; Tapani Makkonen; Harri Sillanpää; G. Meisl; M. Oberkofler; ASDEX Upgrade Team

doi:10.1016/j.nme.2016.09.012

ERO and PIC simulations of gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade

Antti Hakola^*, Markus I. Airila, Nicolas Mellet, M. Groth, J. Karhunen, T. Kurki-Suonio, Tapani Makkonen, Harri Sillanpää, G. Meisl, M. Oberkofler, ASDEX Upgrade Team

^*Corresponding author for this work

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

10 Citations (Scopus)

Abstract

We have modelled net and gross erosion of W in low-density L-mode plasmas in the low-field side strike point region of ASDEX Upgrade by ERO and Particle-in-Cell (PIC) simulations. The observed net-erosion peak at the strike point was mainly due to the light impurities present in the plasma while the noticeable net-deposition regions surrounding the erosion maximum could be attributed to the strong E ×B drift and the magnetic field bringing eroded particles from a distance of several meters towards the private flux region. Our results also imply that the role of cross-field diffusion is very small in the studied plasmas. The simulations indicate net/gross erosion ratio of 0.2–0.6, which is in line with the literature data and what was determined spectroscopically. The deviations from the estimates extracted from post-exposure ion-beam-analysis data (∼0.6–0.7) are most likely due to the measured re-deposition patterns showing the outcomes of multiple erosion-deposition cycles.

Original language	English
Pages (from-to)	423-428
Journal	Nuclear Materials and Energy
Volume	12
DOIs	https://doi.org/10.1016/j.nme.2016.09.012
Publication status	Published - 1 Aug 2017
MoE publication type	A1 Journal article-refereed

Keywords

ASDEX Upgrade
Cross-field diffusion
ERO modelling
Particle drifts
PIC simulations
Tungsten erosion

UN SDGs

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

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title = "ERO and PIC simulations of gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade",

abstract = "We have modelled net and gross erosion of W in low-density L-mode plasmas in the low-field side strike point region of ASDEX Upgrade by ERO and Particle-in-Cell (PIC) simulations. The observed net-erosion peak at the strike point was mainly due to the light impurities present in the plasma while the noticeable net-deposition regions surrounding the erosion maximum could be attributed to the strong E ×B drift and the magnetic field bringing eroded particles from a distance of several meters towards the private flux region. Our results also imply that the role of cross-field diffusion is very small in the studied plasmas. The simulations indicate net/gross erosion ratio of 0.2–0.6, which is in line with the literature data and what was determined spectroscopically. The deviations from the estimates extracted from post-exposure ion-beam-analysis data (∼0.6–0.7) are most likely due to the measured re-deposition patterns showing the outcomes of multiple erosion-deposition cycles.",

keywords = "ASDEX Upgrade, Cross-field diffusion, ERO modelling, Particle drifts, PIC simulations, Tungsten erosion",

author = "Antti Hakola and Airila, {Markus I.} and Nicolas Mellet and M. Groth and J. Karhunen and T. Kurki-Suonio and Tapani Makkonen and Harri Sillanp{\"a}{\"a} and G. Meisl and M. Oberkofler and {ASDEX Upgrade Team}",

note = "Funding Information: 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 number 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. Work performed under EUROfusion WP PFC. Publisher Copyright: {\textcopyright} 2016 The Authors. Published by Elsevier Ltd.",

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doi = "10.1016/j.nme.2016.09.012",

language = "English",

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journal = "Nuclear Materials and Energy",

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T1 - ERO and PIC simulations of gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade

AU - Hakola, Antti

AU - Airila, Markus I.

AU - Mellet, Nicolas

AU - Groth, M.

AU - Karhunen, J.

AU - Kurki-Suonio, T.

AU - Makkonen, Tapani

AU - Sillanpää, Harri

AU - Meisl, G.

AU - Oberkofler, M.

AU - ASDEX Upgrade Team

N1 - Funding Information: 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 number 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. Work performed under EUROfusion WP PFC. Publisher Copyright: © 2016 The Authors. Published by Elsevier Ltd.

PY - 2017/8/1

Y1 - 2017/8/1

N2 - We have modelled net and gross erosion of W in low-density L-mode plasmas in the low-field side strike point region of ASDEX Upgrade by ERO and Particle-in-Cell (PIC) simulations. The observed net-erosion peak at the strike point was mainly due to the light impurities present in the plasma while the noticeable net-deposition regions surrounding the erosion maximum could be attributed to the strong E ×B drift and the magnetic field bringing eroded particles from a distance of several meters towards the private flux region. Our results also imply that the role of cross-field diffusion is very small in the studied plasmas. The simulations indicate net/gross erosion ratio of 0.2–0.6, which is in line with the literature data and what was determined spectroscopically. The deviations from the estimates extracted from post-exposure ion-beam-analysis data (∼0.6–0.7) are most likely due to the measured re-deposition patterns showing the outcomes of multiple erosion-deposition cycles.

AB - We have modelled net and gross erosion of W in low-density L-mode plasmas in the low-field side strike point region of ASDEX Upgrade by ERO and Particle-in-Cell (PIC) simulations. The observed net-erosion peak at the strike point was mainly due to the light impurities present in the plasma while the noticeable net-deposition regions surrounding the erosion maximum could be attributed to the strong E ×B drift and the magnetic field bringing eroded particles from a distance of several meters towards the private flux region. Our results also imply that the role of cross-field diffusion is very small in the studied plasmas. The simulations indicate net/gross erosion ratio of 0.2–0.6, which is in line with the literature data and what was determined spectroscopically. The deviations from the estimates extracted from post-exposure ion-beam-analysis data (∼0.6–0.7) are most likely due to the measured re-deposition patterns showing the outcomes of multiple erosion-deposition cycles.

KW - ASDEX Upgrade

KW - Cross-field diffusion

KW - ERO modelling

KW - Particle drifts

KW - PIC simulations

KW - Tungsten erosion

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U2 - 10.1016/j.nme.2016.09.012

DO - 10.1016/j.nme.2016.09.012

M3 - Article

SN - 2352-1791

VL - 12

SP - 423

EP - 428

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

ER -

ERO and PIC simulations of gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade

Abstract

Keywords

UN SDGs

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