7th International Reflectometry Workshop for Fusion Plasma Diagnostics, 9-12 de Maio de 2005, Garching, Alemanha

	A New Spectral Analysis to Study Pellet Triggered ELMs from Broadband Reflectometry at ASDEX Upgrade
	L. Fattorini, M. E. Manso, P. T. Lang e a Equipa ASDEX Upgrade
	Resumo
	The high-confinement mode (H-mode) is foreseen as the basic operation scenario for ITER. Unfortunately it usually drives transient, edge localized modes (ELMs), causing periodic expulsion of plasma energy and particles. In particular the type-I ELMs, can generate large energy losses from the main plasma, which can lead to unacceptably high heat power loads on the first wall elements, especially on the divertor target plates. ASDEX Upgrade is carrying out experimental studies to control the ELM frequency by mean of an appropriate technique in order to mitigate them. The most successful one was achieved triggering ELMs by cryogenic pellets that has also shown to be a promising technique to investigate ELM physics[1].