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	283: ITER Baseline Scenario Operation near the LH Threshold
Name:	Timothy Luce tim.luce@iter.org	Affiliation:	ITER Organization
Research Area:	Inductive Scenarios	Presentation time:	Not requested
Co-Author(s):		ITPA Joint Experiment :	Yes
Description:	The proposed operating point of the ITER baseline scenario for Q=10 operation has a loss power quite close to the LH power threshold scaling. This is known to lead to issues with density control, giant ELMs, and tearing instability. DIII-D is unique in being able to run q95=3 over a factor of 4 in B, which varies the loss power and the LH threshold in different ways. The hidden variable is density, which is typically also linear with B, so that the loss power and LH threshold power scaling vary somewhat closer than may be expected. However, the density scaling is uncertain and DIII-D can pump a shape nearly the same as the ITER shape, so the degeneracy can be broken. The proposal is to run the ITER baseline scenario over a range of B=0.5-2.1 T at the natural density and ~half that to see how the operating point changes. Time permitting, the points will be repeated at low applied torque.	ITER IO Urgent Research Task :	No
Experimental Approach/Plan:
Background:	A two-shot look at this was done during the ITER baseline scenario experiment in 2012 and saw dramatic difference in the plasma behavior. This work contributes to the ITPA joint experiment IOS-1.3 (new for 2013).
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