Intra-ELM Phase Modelling of a JET ITER-like Wall H-mode Discharge with EDGE2D-EIRENE

Intra-ELM Phase Modelling of a JET ITER-like Wall H-mode Discharge with EDGE2D-EIRENE

Intra-ELM Phase Modelling of a JET ITER-like Wall H-mode Discharge with EDGE2D-EIRENE 150 150 Mathew
CCFE-PR(15)115

Intra-ELM Phase Modelling of a JET ITER-like Wall H-mode Discharge with EDGE2D-EIRENE

We present the application of an improved EDGE2D-EIRENE SOL transport model for the ELM phase utilizing kinetic correction of the sheath-heat-transmission coefficients and heat-flux-limiting factors used in fluid SOL modelling. With a statistical analysis over a range of similar Type-I ELMy H-mode discharges performed at the end of the first JET ITER-like wall campaign, we achieved a fast (?t=200?s) temporal evolution of the outer midplane ne and Te profiles and the target-heat and particle-flux profiles, which provides a good experimental data set to understand the characteristics of an ELM cycle. We will demonstrate that these kinetic corrections increase the simulated heat-flux-rise time at the target to experimentally observed times but the power-decay time at the target is still underestimated by the simulations.. This longer decay times are potentially related to a change of the local recycling coefficient at the tungsten target plate directly after the heat pulse.

Collection:
Journals
Journal:
Journal of Nuclear Materials
Publisher:
Elsevier
Published date:
08/01/2015