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	222: Investigation of optimum pellet injection geometry for pellet triggering minimum throughput/PFC flux
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, G. Huijsmans, S. Futatani	ITPA Joint Experiment :	No
Description:	This proposal aims at improving the determination of the minimum pellet penetration and pellet size for ELM triggering by injecting the pellets in a tangent direction to the plasma edge and to minimize fuel throughput and power fluxes to PFCs.	ITER IO Urgent Research Task :	Yes
Experimental Approach/Plan:	Develop a H-mode discharge with the lowest possible ELM frequency and optimum X-point position for tangential pellet injection from the R-2 line, which should be similar to that already developed for the super-X divertor experiments. Perform pellet injection in this configuration by adjusting velocity and pellet size until ELMs are triggered (or not triggered). Decrease the X-point height in several steps and repeat the scans of pellet plasma parameters. Repeat until pellets of all sizes and velocities achievable trigger ELMs.
Background:	ELM control by pellet pacing is one of the two ELM control schemes considered in the ITER baseline. The optimization of pellet pacing relies on the injection of the smallest possible pellets (to reduced throughput) but that provides a sufficiently large perturbation in the pedestal to trigger the ELM.
Resource Requirements:	NBI, super-X divertor plasma configuration. pellet injection
Diagnostic Requirements:	Core and pedestal plasma ne,Te, Ti, pellet diagnostics and IR divertor power fluxes during ELMs
Analysis Requirements:	Analyse the appropriateness of the existing Super-X divertor H-modes for these experiments
Other Requirements:	--