Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
ERO and PIC simulations of gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade
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, Tungsten erosion, ERO modelling, PIC simulations, Particle drifts, Cross-field diffusion
ERO and PIC simulations of gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade
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, Tungsten erosion, ERO modelling, PIC simulations, Particle drifts, Cross-field diffusion
ERO and PIC simulations of gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade
A. Hakola (Autor:in) / M.I. Airila (Autor:in) / N. Mellet (Autor:in) / M. Groth (Autor:in) / J. Karhunen (Autor:in) / T. Kurki-Suonio (Autor:in) / T. Makkonen (Autor:in) / H. Sillanpää (Autor:in) / G. Meisl (Autor:in) / M. Oberkofler (Autor:in)
2017
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
Metadata by DOAJ is licensed under CC BY-SA 1.0
| DOAJ | 2016
ERO modelling of net and gross erosion of marker samples exposed to L-mode plasmas on ASDEX Upgrade
| DOAJ | 2020