SOL characterization and LH coupling measurements on JET in ITER-relevant conditions

Abstract

Lower hybrid (LH) current drive experiments have been carried out on JET with an antenna–plasma separatrix distance varying between 0.09 and 0.15 m, and LH power in the range 0–3.2 MW. For different plasma configurations, the electron density ne of the scrape-off layer has been studied by the mean of a reciprocating Langmuir probe magnetically connected to the LH antenna. For pulses in the high confinement regime (H mode) characterized by strong particle bursts in the plasma edge, the edge localized modes (ELMs), profiles of the saturation current (Jsat) are obtained with a sufficient time resolution to distinguish 'between ELMs' and during the rise and decay of the ELMs.