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	133: Fast Runaway Shutdowns by MGI
Name:	John Wesley wesley@fusion.gat.com	Affiliation:	General Atomics
Research Area:	Disruption Mitigation	Presentation time:	Requested
Co-Author(s):		ITPA Joint Experiment :	Yes
Description:	Investigate use of pre-emptive (before CQ and post-emptive high-Z MGI to effect a fast (< 100 ms) runaway electron current shutdown in vertically-stable IWL and elongated/vertically-unstable LSN/'ITER-like target plasmas. Clarify target configuration, impurity assimilation and RE current dissipation attributes identified in 2010 and 2012 campaigns. LSN aspect requires development of more-reliable RE initiation method(s)	ITER IO Urgent Research Task :	Yes
Experimental Approach/Plan:	Make REs with Ar pellet and/or Ar MGI; kill REs with remnant or added gas, low-Z and high-Z. Assess passive and active control effects and resulting to-wall and in-situ energy depositions. Compare continuous rampdown versus partial rampdown an crash scenarios. Compare D2, helium, carbon (pellet), neon, argon, xenon, krypton injection.
Background:	ITER needs a post-emptive RE dissipator. High-Z MGI before and after CQ gives promising results
Resource Requirements:	Ar pellet injector, MGI systems (at least two different gases in separate systems), IWL and LSN low-density EC heated targets.
Diagnostic Requirements:	, standard and new RE diagnostics, fast camera and IR views of inner wall and top/bottom divertor for vertically-unstable RE channels.
Analysis Requirements:	RTEFIT and JFIT, dynamic RE gain/loss models, ....
Other Requirements: