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	300: Effect of triangularity in ITER shape and improved shaping
Name:	Gary Jackson jackson@fusion.gat.com	Affiliation:	General Atomics
Research Area:	Inductive Scenarios	Presentation time:	Not requested
Co-Author(s):	A. Hyatt, D. Humphreys, W. Solomon	ITPA Joint Experiment :	No
Description:	Examine effect of triangularity on stability in the approximate ITER baseline shape, especially with the improved ITER shape.	ITER IO Urgent Research Task :	No
Experimental Approach/Plan:	Reproduce an IBS discharge, e.g 147044. Vary lower trinagularity from appx 0.64 - 0.78. Do this without cryopumping (ne ~ 6e19)shortly after a boronization for uniform recycling. If lithium is used, this might also provide more uniform reycycling. Use standard IBS parameters (betaN=1.8, q95=3.1, etc.), but full Co-beams. Map stability region by varying li (dIp/dt).
Background:	Some evidence exists that the stability region is reduced at lower triangularity in IBS discharges, but no systematic scan has been performed. The DIII-D scenario has not exactly reproduced the ITER shape, especially the lower outer squareness due to limitations with return current. This is being addressed in FY13 with shape development and should allow a wider range of triangularity, approaching the ITER baseline shape. The one impediment is that part of this scan would be on the baffle, the other on the floor, which has traditionally had cryo pumping. This might be obviated by a fresh boronization or lithium injection.
Resource Requirements:	New boronization (after 1 day), possibly lithium if the dropper has been commissioned. Both of these could provide more uniform recycling as triangularity is moved onto the baffle.
Diagnostic Requirements:	standard
Analysis Requirements:
Other Requirements: