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	180: Establish the incremental confinement of EC power in high betaN steady-state scenario discharges
Name:	John Ferron ferron@fusion.gat.com	Affiliation:	General Atomics
Research Area:	Steady State Heating and Current Drive	Presentation time:	Not requested
Co-Author(s):		ITPA Joint Experiment :	No
Description:	Produce a series of discharges dedicated to determining whether EC power can be used effectively to increase the stored energy. Do a several point scan of betaN and density and EC deposition location. Compare the incremental confinement with EC power and neutral beam power, both on and off-axis. Determine whether there are steady-state scenario relevant parameter regimes where density increases when EC power is applied in addition to regimes where density decreases when EC power is applied.	ITER IO Urgent Research Task :	No
Experimental Approach/Plan:	See the description paragraph.
Background:	It is not clear that EC power, as it is presently used in steady-state scenario discharges, is effective at heating. In fact, there is evidence that when off-axis EC power is injected, additional neutral beam power is required in order to maintain betaN. The presently available neutral beam power at DIII-D is marginally low for reliably obtaining fNI = 1, so additional heating sources are required. A substantial upgrade in EC power is planned for DIII-D and this is a potential source of the power necessary to achieve high betaN, but it is necessary to understand how this power can best be applied in steady-state scenarios. We also need to know how to model H factors as a function of EC power.
Resource Requirements:
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