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	223: Demonstration of integrated ELM-paced pellet fuelled H-mode plasma in ITER-relevant range.
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 :	Yes
Description:	This proposal aims at demonstrating that plasmas in which ELMs are controlled by pellet triggering to an ITER-like relevant level can be appropriately fuelled with fuelling pellets that have an ITER-like peripheral deposition.	ITER IO Urgent Research Task :	Yes
Experimental Approach/Plan:	Establish an ITER-like discharge with low ELM frequency and then increase the ELM frequency with the smallest possible LFS/X-point pacing pellets by a factor 4, 8, 12. Then introduce high field side pellets for fuelling at various frequencies and with characteristics that lead to a similar particle deposition as in ITER (i.e. rho_dep = 0.8-0.9) and determine effectiveness of pellet fuelling by comparing with gas fuelling replacing fuelling pellets. Repeat with increased input power (by 2 to increase edge temperature) and pellet controlled ELM frequency increased by 2,4 and 6 with respect to natural frequency in these conditions.
Background:	ELM control by pellet pacing is one of the control schemes included in the ITER baseline which also relies in pellet injection for plasma fuelling. Pellet penetration in ITER is also relatively shallow for fuelling pellets so that triggering of ELMs by pellet pacing could affect the efficiency of pellet fuelling. The compatibility of ELM control by pellet pacing with fuelling of plasmas by pellet fuelling with ITER-like peripheral deposition depth remains to be demonstrated.
Resource Requirements:	NBI, pellet injectors.
Diagnostic Requirements:	Core and pedestal plasma ne,Te, Ti, pellet diagnostics and IR divertor power fluxes during ELMs
Analysis Requirements:	Existing experiments with pellet pacing from LFS and fuelling pellets from HFS.
Other Requirements: