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	241: C-13 and background carbon
Name:	Clement Wong wongc@fusion.gat.com	Affiliation:	General Atomics
Research Area:	Plasma-material Interface	Presentation time:	Not requested
Co-Author(s):	C.P.C. Wong, D. Rudakov, P.C. Stangeby, J. Watkins, W. Wampler, D. Elder, J. Brooks, A. McLean	ITPA Joint Experiment :	No
Description:	Quantify the eroded C from sample versus the carbon background from DIII-D	ITER IO Urgent Research Task :	No
Experimental Approach/Plan:	Expose a depth marked C-13 coating on DiMES and at the same time, collect the C-13 and background carbon deposit in a down stream Si wall slot. After exposure to a few detached plasma discharges we will be able to distinguish both eroded C-13 from the sample and background plasma in DIII-D.
Background:	DIII-D is a carbon machine. In quantifying net and gross-erosion from a carbon wall, it is impossible to distinguish the net and gross erosion impacts from the sample surface itself and from the background carbon. With a C-13 surface, the distinction can be quantified at least for the prescribed plasma discharge. This will aid the benchmarking of modeling surface material erosion and re-deposition with better quantification of the C background in DIII-D. We have experience in designing the slot on DiMES for the collection of carbon in DIII-D.
Resource Requirements:	One ½ day experiments, ITER relevant partially detached LSN H-mode with OSP on DiMES and with as many repeated shot as time allow.
Diagnostic Requirements:	All available lower divertor diagnostics, Langmuir probes, DiMES, core and divertor Thomson, CER with C lines. IRTV view of DiMES highly desirable.
Analysis Requirements:	Analysis of collected diagnostics data.
Other Requirements: