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	88: inner column limiter expts to establish if ITER wall-limiter design should include �??funnel effect'
Name:	Peter Stangeby peter.stangeby@utoronto.ca	Affiliation:	University of Toronto
Research Area:	Divertor & SOL Physics	Presentation time:	Requested
Co-Author(s):	Tony Leonard, Richard Pitts (ITER), Dmitry Rudakov, Clement Wong,	ITPA Joint Experiment :	No
Description:	Motivation: The proposed experiment will provide important information for the ITER decision in 2013 about the Be wall-limiter design. ITER will startup/rampdown on inner wall as limiter. Present ITER wall design assumes q-parallel loading only and does not include the "funnel effect" (direct q-perpendicular loading). On TFTR, JET there was/is power deposition at inside midplane that can not be explained by q_par loading and has been ascribed to a funnel effect (q_perp loading). There is also some other experimental evidence for the funnel effect; however, it remains a poorly explored, understood effect; accordingly the decision was made to not include it in ITER Be wall design shaping; this is now being questioned; final design decision will be next year. It is proposed to run limiter plasmas on DIII-D central column, with ir viewing, to get data on funnel effect for ITER wall design decision.	ITER IO Urgent Research Task :	Yes
Experimental Approach/Plan:	It is proposed to run L-mode limiter plasmas on DIII-D central column, with ir viewing, to get data on funnel effect for ITER wall design decision. Use the same range of densities and plasma currents as in the previous DIII-D experiments in support of establishing a startup/rampdown database for ITER, Dmitry Rudakov [2011 APS].
Background:	The "funnel effect" is described in Sec. 25.2 of Stangeby "The Plasma Boundary of Magnetic Fusion Devices", and references there. See also Baelmans, Reiter et al, JNM 290-293 (2001) 537, which report B2-EIRENE code analysis of the funnel effect, including application to the TEXTOR ALT-II limiter.
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