MEMOS Code Validation on JET Transient Tungsten Melting Experiments

The ITER Organization has recently decided to install a full-tungsten (W) divertor from the start of operations. One of the key issues with such a strategy is the possibility of W melting and melt splashing during transients, which can lead to modifications of surface topology. A new experiment was now performed on JET-ILW, in which a deliberately misaligned W element (lamella) in the outer divertor was used to perform controlled ELM transient melting experiments in a tokamak. This paper reports on the application of the 3D-MEMOS code to modeling of these experiments. Input heat loads are obtained from experimental data. The code indicates that that shielding by the evaporated tungsten prevents bulk melting. The simulations are also able to quantitatively reproduce the dimensions of the damaged area observed by high resolution photography after the first pulse in which melting was achieved.
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