DIII-D RESEARCH OPPORTUNITIES FORUM FOR THE 2013 EXPERIMENTAL CAMPAIGN Review | Direct submission with log-in | Request submission without log-in
Print this page

Print this page
Title	293: Test of ETG zeff supression
Name:	Gary Staebler staebler@fusion.gat.com	Affiliation:	General Atomics
Research Area:	Turbulence & Transport	Presentation time:	Not requested
Co-Author(s):		ITPA Joint Experiment :	No
Description:	Inject neon into a hybrid regime plasma and look for changes in the electron thermal transport.	ITER IO Urgent Research Task :	No
Experimental Approach/Plan:	probably need to inject the neon gradually in order to prevent sudden changes to the current chanel. Start with an established Hybrid regime and add incresing amounts of neon, CER on carbon and Neon. Need full profile diagnostics. High-k fluctuation measurements desireable.
Background:	Linear stability shows that kinetic impurity species have a stabilizing effect on the high-k ETG mode. The hybrid regime has been shown to have electron thermal transport domianted by ETG modes with TGLF. Previous modeling has shown a large difference in electron transport is the carbon is treated as simple dillution or as a fully kinetic species. It is important to validate the predicted effect of impurities on the ETG transport with experiement. It is easier to control neon cconcentrations in the plasma then carbon. An improvment in H-modes has been observed with neon on DIII-D in the past. (IH-mode)
Resource Requirements:	1/2 day would be sufficient using a well established hybrid target. Slow gass puff of neon after the current flatop with a duration increased from shot to shot. One wasted shot to find the disruption limit then 3-4 good shots at lower neon levels.
Diagnostic Requirements:	need CER for both carbon and neon, all plasma profile measurments. As many fluctuation measurments as the target conditions allow. High-k a priority.
Analysis Requirements:	ONETWO or TRANSP analysis. XPTOR predictive runs with TGLF+NEO.
Other Requirements: