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Physics of plasma burn-through and DYON simulations for the JET ITER-like wall

2013; IOP Publishing; Volume: 53; Issue: 8 Linguagem: Inglês

10.1088/0029-5515/53/8/083024

1741-4326

Hyun-Tae Kim, A. C. C. Sips,

Particle accelerators and beam dynamics

This paper presents the DYON simulations of the plasma burn-through phase at Joint European Torus (JET) with the ITER-like wall.The main purpose of the study is to validate the simulations with the ITER-like wall, made of beryllium.Without impurities, the burn-through process of a pure deuterium plasma is described using DYON simulations, and the criterion for deuterium burn-through is derived analytically.The plasma burn-through with impurities are simulated using wallsputtering models in the DYON code, which are modified for the ITER-like wall.The wall-sputtering models and the validation against JET data are presented.The impact of the assumed plasma parameters in DYON simulations are discussed by means of parameter scans.As a result, the operation space of prefill gas pressure and toroidal electric field for plasma burn-through in JET is compared to the Townsend avalanche criterion.