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	137: 3D material migration during RMP ELM suppression
Name:	Oliver Schmitz oschmitz@wisc.edu	Affiliation:	University of Wisconsin
Research Area:	ELM Control	Presentation time:	Requested
Co-Author(s):	A. McLean, T.E.Evans, R. Laengner	ITPA Joint Experiment :	Yes
Description:	Measure erosion yields in 3D helical lobe structure induced by RMP fields.	ITER IO Urgent Research Task :	Yes
Experimental Approach/Plan:	Use the DiMeS Porous Plug Injector (PPI) to directly measure the chemical erosion yield and the local C sputtering from MDS spectroscopy. Apply PPI to L-mode and H-mode with RMP ELM suppression. Outer leg has to be placed on outer shelf and swept accross PPI location maintaining ELM cuppression. This has to be developed.
Background:	Formation of 3D striated heat and particle flux pattern have been observed as a feature accompanying ELM suppression in low collissionality plasmas in ITER similar shape. This is likely to change local erosion characteristics, material migration and eventually the re-deposition. Suitable numerical tools to address the impact of this observation on the divertor life time and integrety at ITER are under way. We are coupling EMC3-Eirene to ERO to address this. However, experimental data to validate this code package are required and the D3D setup is an ideal test bed for this important exploration of a basic physics aspects accompanying RMP ELM suppression. The actual experiemnt connects to a first of its time measurement in L-mode sicharges which have shown a reduction of the chemical ersion yield with C surface material. Similar measurements are obtained at TEXTOR and this experiment adresses ITPA task PEP19 issues.
Resource Requirements:	ITER04 patch panel, Icoils on C-supplies, n=1 EFC, PPI with 13CH4 loaded - the PPI head has to be enhanced for H-mode application. FZJ can contribute with design and manufacture effort to make this happen. A PhD thesis is launched in this field and hence appropriate technical and scientific support is provided.
Diagnostic Requirements:	MDS spectrometer, DiMeS camera, PPI, TTV cameras, IR TVs, Xpt soft X-ray with low energy cut off
Analysis Requirements:	TRIP3D, EMC3-Eirene/ ERO package, M3D-C1 for plasma response being included into EMC3-Eirene modeling (IO task)
Other Requirements:	--