Model validation of tungsten erosion and redeposition properties using biased tungsten samples on DiMES

L. Cappelli , J. Guterl , N. Fedorczak , D.L. Rudakov , G. Sinclair , T. Abrams , S. Di Genova , U. Losada , I. Bykov , Ž. Popović , D. Truong , J. Watkins , R.S. Wilcox , W.R. Wampler , E. Serre (1)

1 M2P2 - Laboratoire de Mécanique, Modélisation et Procédés Propres

An experiment was performed in the DIII-D lower divertor to validate numerical SOL tungsten (W) impurity erosion and redeposition simulations against experimental data. The net and gross erosion of W were calculated as a function of the voltage (or bias) applied to the exposed material. Five samples were inserted into the DIII-D lower divertor using the Divertor Material Evaluation System (DiMES) manipulator and exposed to constant L-mode attached plasma conditions. Each sample was partially coated with W. During plasma shots, samples were biased with respect to the machine vessel ground, ranging from −60 V to 25 V. The ERO2.0 code was used to numerically simulate the experiment aiming to compare the numerical results with experimental measures. A good agreement is found between estimated and measured tungsten erosion at least for negative biases.

Mots clés: Bias; Tungsten; Erosion; Redeposition; ERO2

Domaines: Mécanique des fluides [physics.class-ph]

L. Cappelli, J. Guterl, N. Fedorczak, D.L. Rudakov, G. Sinclair, et al.. Model validation of tungsten erosion and redeposition properties using biased tungsten samples on DiMES. Nuclear Materials and Energy, 2023, 37, pp.101551. ⟨10.1016/j.nme.2023.101551⟩. ⟨hal-04546765⟩