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	229: CQ de-confinement of REs using pulsed impurity injection
Name:	Alberto Loarte-Prieto Alberto.Loarte@iter.org	Affiliation:	ITER Organization
Research Area:	Disruption Mitigation	Presentation time:	Requested
Co-Author(s):	E. Hollmann, F. Saint-Laurent. N. Commaux, L. Baylor	ITPA Joint Experiment :	No
Description:	Demonstrate de-confinement of seed REs in initial phases of CQ with rapid impurity injection into CQ plasma edge.	ITER IO Urgent Research Task :	Yes
Experimental Approach/Plan:	Create disrupting target plasma with large RE seed in the CQ that evolves to a RE plateau of > 200 KA by injection of Ar (killer pellet, if possible) into low density IWL plasma. Then apply to this target plasma massive material injection pulse (from valves of shattered pellets) with various time lags with respect to the initial Ar injection and document effect on final runaway current. Perform variations of material amount of MMI in the CQ and gas specie (Ne, Ar + mixture with H or He?).
Background:	It has been proposed to de-confine RE seeds in ITER by using pulsed bursts of gas fired into the CQ plasma, thus shrinking the current channel and destabilizing tearing modes. This scheme has been tested experimentally in T-10 and Tore-Supra but results are not conclusive so far and needs systematic demonstration of its principle in tokamak experiments. We propose to test this proof of principle by using two DIII-D material injection systems one to generate the runaways and the other to de-confine them.
Resource Requirements:	1 run day. Two material injection systems for creation of runaways and for their de-confinement.
Diagnostic Requirements:	Runaway diagnostics and IR cameras.
Analysis Requirements:
Other Requirements: