DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2013 EXPERIMENTAL CAMPAIGN Review | Direct submission with log-in | Request submission without log-in
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Title	226: Compatibility of ELM suppressed regimes by 3-D fields with pellet injection for plasma fuelling
Name:	Alberto Loarte-Prieto Alberto.Loarte@iter.org	Affiliation:	ITER Organization
Research Area:	ELM Control	Presentation time:	Requested
Co-Author(s):	L. Baylor, N. Commaux, T. Evans, O. Schmitz, G. Huijsmans, S. Futatani	ITPA Joint Experiment :	No
Description:	This experiment aims to study the ELM triggering and its avoidance of an ELM when a pellet with ITER-like particle deposition profiles is injected into ELM supressed regimes with 3-D fields (RMP and QH-mode)while maintaining a low collisionality plasma and to quantify how much lower is the particle confinement time for pellet injected particles in the presence of 3-d fields.	ITER IO Urgent Research Task :	Yes
Experimental Approach/Plan:	Stablish suppressed ELM discharges with RMP in n=2, n=3 and QH-mode with various levels of heating power to scan plasma edge temperatures (and effective pellet deposition depth). Inject fuelling pellets from the HFS at low frequency so that the plasma density and collisionality is not changed and determine if ELMs are triggered by the pellets. If they are, adjust I-coil current and evaluate if pellet triggered ELMs can be avoided for a given level of I-coils current.
Background:	The injection of shallow pellet can lead to the triggering of ELMs in suppressed ELM regimes and this remains an open compatibility issue of ELM suppression with pellet injection for plasma fuelling in ITER. In addition, 3-D fields can lead to a decreased edge particle confinement time that can increase fuelling requirements. It is thus important to quantify the edge particle confinement time in suppressed ELM regimes as this is important to quantify the throughput requirements associated with ELM suppression by in-vessel coils and potential QH-mode operation in ITER.
Resource Requirements:	NBI heating, I-coils in n=2 and n=3 configurations for RMP and QH-modes and pellet injection from HFS.
Diagnostic Requirements:	Core plasma and pedestal plasma measurements, divertor IR measurements for ELM fluxes and pellet measurements.
Analysis Requirements:	Analysis of edge stability, pedestal measurements, pellet measurements and divertor power fluxes.
Other Requirements: