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

Antti Hakola, M. I. Airila, N. Mellet, M. Groth, J. Karhunen, T. Kurki-Suonio, T. Makkonen, H. Sillanpää, G. Meisl, M. Oberkofler, ASDEX Upgrade Team

Research output: Contribution to journalArticleScientificpeer-review

3 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 languageEnglish
Pages (from-to)423-428
Number of pages6
JournalNuclear Materials and Energy
Volume12
DOIs
Publication statusPublished - 1 Aug 2017
MoE publication typeA1 Journal article-refereed

Fingerprint

Tungsten
erosion
Erosion
tungsten
cells
Plasmas
simulation
Ion beams
ion beams
Impurities
Magnetic fields
Fluxes
deviation
impurities
cycles
estimates
magnetic fields

Keywords

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

Cite this

Hakola, Antti ; Airila, M. I. ; Mellet, N. ; Groth, M. ; Karhunen, J. ; Kurki-Suonio, T. ; Makkonen, T. ; Sillanpää, H. ; Meisl, G. ; Oberkofler, M. ; ASDEX Upgrade Team. / ERO and PIC simulations of gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade. In: Nuclear Materials and Energy. 2017 ; Vol. 12. pp. 423-428.
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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.",
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ERO and PIC simulations of gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade. / Hakola, Antti; Airila, M. I.; Mellet, N.; Groth, M.; Karhunen, J.; Kurki-Suonio, T.; Makkonen, T.; Sillanpää, H.; Meisl, G.; Oberkofler, M.; ASDEX Upgrade Team.

In: Nuclear Materials and Energy, Vol. 12, 01.08.2017, p. 423-428.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

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, M. I.

AU - Mellet, N.

AU - Groth, M.

AU - Karhunen, J.

AU - Kurki-Suonio, T.

AU - Makkonen, T.

AU - Sillanpää, H.

AU - Meisl, G.

AU - Oberkofler, M.

AU - ASDEX Upgrade Team

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.

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