Abstract
Series of experiments on tungsten (W) erosion and transport in Argon (Ar) plasma were conducted at the linear plasma device PSI-2. W erosion was measured with three independent methods: WΙ spectroscopy, mass loss and quartz micro-balance (QMB) deposition sensor. Consistent set of data produced in these experiments was interpreted using the 3D ERO code simulations, which have reproduced all the main trends observed. Influence of the physical model assumptions (e.g. energy and angular distributions of sputtered particles) was demonstrated. The effect of WΙ effective quasi-metastable (MS) state population dynamics on spectroscopy measurements is shown; the characteristic relaxation time is determined. The measured physical sputtering yields for W are close to the simulated data obtained in the binary collision approximation (BCA) approach (SDTrimSP code). The remaining discrepancies between simulations and the experiment, mostly in spectroscopy, are accounted to the uncertainties in the plasma parameters and atomic data.
Highlights
Plasma-surface interaction (PSI) determines the duty cycle of ITER to a large extent
Conducted experiments on the W erosion and transport at PSI-2 were accompanied by the simulations by the 3D Monte-Carlo ERO code
Some modifications of the ERO physical model were performed for this modelling including the energy and angular distributions, WI metastables and Ar+/Ar2+ ion fraction accounting
Summary
Plasma-surface interaction (PSI) determines the duty cycle of ITER to a large extent. Tungsten (W) is of particular interest because it was chosen as the main material for the divertor area of ITER due to its high melting temperatures, low sputtering yield and low tritium retention [1] Linear devices such as PISCESB [2], PILOT-PSI [3] and PSI-2 [4,5] have a number of advantages for investigating specific problems of PSI [6]: continuous operation, compactness, straightforward geometry and facilitated control over the experimental parameters.
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