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	152: Transport shortfall at high gyrobohm flux
Name:	Sterling Smith smithsp@fusion.gat.com	Affiliation:	General Atomics
Research Area:	Turbulence & Transport	Presentation time:	Not requested
Co-Author(s):	Chris Holland, Nathan Howard, Craig Petty	ITPA Joint Experiment :	No
Description:	Chris Holland recently showed that for a database of shots, the shortfall of predicted transport is worst when experimental fluxes in gyrobohm units are high. This was most recently seen in the DeBoo 2011 electron critical gradient and stiffness experiment at the highest Te gradients and heat fluxes: GYRO predicted fluxes agreed well at lower fluxes and gradients, but not at the highest. The idea here is to perform a systematic radial scan of localized ECH heating to obtain the high fluxes at multiple radii.	ITER IO Urgent Research Task :	No
Experimental Approach/Plan:	Use 5-6 gyrotrons aimed at the same location to create a high flux/gradient region just outside (in minor radius) of the deposition region. Possibly use the 6th for heat pulse measurements. Obtain steady state conditions over a scan of the radial deposition location. Possibly incorporate additional neutral beam heated phases, although it has been shown in the past that these are not so useful for getting to the highest Te gradients. There should be multiple opportunities to sample the ion kinetic quantities (an occasional beam blip.)
Background:
Resource Requirements:	5 gyrotrons for power balance interpretive alaysis; 6 for additional heat pulse and therefore non-diffusive analysis.
Diagnostic Requirements:	ECE. Michelson ECE. CECE. Thomson. Profile Reflectometry. CER. DBS. Bolometer.
Analysis Requirements:	Power balance analysis with ONETWO or TRANSP. Fluctuation analysis by fluctuation experts. GYRO and TGLF runs to get fluxes.
Other Requirements: