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	165: D2 + few % Ne shattered pellets for disruption mitigation
Name:	Nicolas Commaux commaux@fusion.gat.com	Affiliation:	Oak Ridge National Lab
Research Area:	Disruption Mitigation	Presentation time:	Not requested
Co-Author(s):	P. Parks, L. Baylor, E. Hollmann, D. Humphreys, N. Eidietis, J. Wesley, V. Izzo	ITPA Joint Experiment :	No
Description:	Use the SPI to inject D2 pellets containing a few % (~5) of neon in an H mode plasma. Simulations carried out by P. Parks have determined that this approach should enable achieving higher densities than regular D2 shattered pellets without inducing too fast a current quench.	ITER IO Urgent Research Task :	Yes
Experimental Approach/Plan:
Background:	Achieving high current quench electron densities could prove key to suppress or at least to mitigate the runaway production in ITER. Present massive particle injection systems can achieve pretty high densities but they are still a factor of 5 too low assuming that reaching the Rosenbluth density is critical. The other issue is that injecting more particles could induce current quenches that are too fast in ITER. These could induce damages on the internal structures of the vessel because of the high level of Eddy currents. Simulations done by P Parks on shattered pellet injection showed that trace amounts of Neon in a deuterium pellet could potentially raise the final density significantly without increasing the current decay rate too much. This is what this experiment is proposing to test.
Resource Requirements:	The SPI. Regular tokamak systems. Good beams availability
Diagnostic Requirements:	Regular disruption diagnostics. The new IR periscope for heat load characterization. CER set for VB, SPRED
Analysis Requirements:
Other Requirements: