ERO2.0 modelling of the effects of surface roughness on molybdenum erosion and redeposition in the PSI-2 linear plasma device

0540332 - ÚFP 2021 RIV SE eng J - Journal Article
Eksaeva, A. - Borodin, D. - Romazanov, J. - Kreter, A. - Pospieszczyk, A. - Dickheuer, S. - Möller, S. - Göths, B. - Rasinski, M. - Knochen, M. - Terra, A. - Kirschner, A. - Borodkina, I. - Eichler, M. - Unterberg, B. - Brezinsek, S. - Linsmeier, Ch. - Vassallo, G. - Pedroni, M. - Passoni, M. - Dellasega, D. - Sala, M. - Romeo, F. - Henderson, S. - O'Mullane, M. - Summers, H. - Tskhakaya, David - Schmid, K.
ERO2.0 modelling of the effects of surface roughness on molybdenum erosion and redeposition in the PSI-2 linear plasma device.
Physica Scripta. Roč. 2020, T171 (2020), č. článku 014057. ISSN 0031-8949. E-ISSN 1402-4896
EU Projects: European Commission(XE) 633053 - EUROfusion
Institutional support: RVO:61389021
Keywords : 3d monte carlo ero * Ero2.0 * Linear plasma device * Molybdenum * Sputtering * Surface morphology * Surface roughness
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 2.487, year: 2020
Method of publishing: Limited access
https://iopscience.iop.org/article/10.1088/1402-4896/ab5810

The surface morphology of plasma-facing components (PFCs) and its evolution during plasma irradiation has been shown to have a significant effect on the erosion and subsequent transport of sputtered particles in plasma. This in turn can influence the resulting lifetime of PFCs. A model for treatment of the effect of surface roughness on the erosion of PFCs has recently been incorporated into the three-dimensional Monte Carlo code ERO2.0. First simulations have confirmed a significant influence of the assumed surface roughness (for both regular and stochastic numerically constructed samples) on both the effective sputtering yields Y eff and the effective angular distributions of sputtered particles. In this study, a series of experiments at the linear plasma device PSI-2 are conducted to test the effect of surface roughness on the sputtering parameters. Graphite samples prepared with a 100 nm molybdenum layer with various surface roughness characteristic sizes (R a = 110 nm, 280 nm, 600 nm and R a < 20 nm) were exposed to a helium plasma in the PSI-2 linear plasma device at a magnetic field B = 0.1 T. These PSI-2 experiments were simulated using ERO2.0 with a surface morphology model. Simulations are able to reproduce the experimentally observed significant suppression of erosion for higher R a values.
Permanent Link: http://hdl.handle.net/11104/0317974