ELM ion energies in the ASDEX Upgrade far scrape-off layer

1. Introduction. Type I ELMs carry a significant fraction of their energy W ELM across the scrape-off layer (SOL) and are the dominant source of the first wall thermal load and impurity sputtering. In ITER, W ELM will be considerably larger compared to present tokamaks and the ELM-wall interaction may be an issue for the first wall lifetime and impurity production. New measurements of the ELM ion energies by a retarding field analyzer (RFA) in the ASDEX Upgrade (AUG) far SOL are presented. Type I and, for the first time, mitigated ELMs are captured by a RFA at different W ELM and the outer midplane separatrix distance r sep . A fluid model of the ELM filament parallel transport [1] is employed to obtain the characteristic range of the ELM-averaged filament radial propagation speeds v r

Physics and Technology in the Ion-cyclotron Range of Frequency on Tore Supra and TITAN test facility: implication for ITER

To support the design of ITER ion-cyclotron range of frequency heating system and to mitigate risks of operation in ITER, CEA has initiated an ambitious Research & Development program accompanied by experiments on Tore Supra or test bed facility together with a significant modeling effort. The paper summarizes the recent results in the following area: • Comprehensive characterization of a new Faraday screen concept tested on Tore Supra antenna. RF sheath rectification is now better understood: a new model has been developed and applied to ITER. • Full wave modeling of ITER ICRH heating and current drive scenarios with EVE code. With 20MW of power, a current of ±400kA could be driven on axis in the DT scenario. • First operation of CW test bed facility, TITAN, designed for ITER ICRH components testing and could host up to a quarter of an ITER antenna. • R&D of high permittivity materials to improve load of test facilities to mimic ITER plasma conditions