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	210: The Dependence of Poloidal Rotation on Turbulence
Name:	Colin Chrystal chrystal@fusion.gat.com	Affiliation:	General Atomics
Research Area:	Plasma Rotation	Presentation time:	Not requested
Co-Author(s):	K.H. Burrell	ITPA Joint Experiment :	No
Description:	The goal is this experiment is to study poloidal rotation before and after the formation of an ITB. Turbulence will be minimized where the ITB forms and this will allow for the study of the effect of turbulence on poloidal rotation.	ITER IO Urgent Research Task :	No
Experimental Approach/Plan:	Form ITB's of varying strengths and toroidal rotations, measure poloidal rotation with CER (using vertical and in/out tangential methods), and use fluctuation diagnostics to assess turbulence levels. The CER measurements require particular timing of 30LT or 30RT, 330LT and 210LT or 210RT, and BES requires one of the 150 neutral beams. Total beam power and torque will be varied to form ITB's of varying strength and therefore different levels of turbulence suppression. The main focus of the experiment is measurements of rotation and fluctuations in the time before the ITB forms and the time before the ITB collapses.
Background:	Poloidal rotation on DIII-D is not well understood and agreement between measurements and neoclassical theory is unpredictable. A relatively new poloidal rotation diagnostic using tangential CER chords on the high- and low-field side of the plasma is particularly useful for acquiring measurements to compare to neoclassical theory, though it can only make measurements in the core of the plasma. Results from this diagnostic on a few ITB shots from 2012 seem to indicate that agreement between measurement and theory improves after ITB formation, suggesting that the ITB's turbulence suppression allows the poloidal rotation to become neoclassical. Using the ITB as a tool to control turbulence while measuring poloidal rotation should allow the relationship between the two to be studied.
Resource Requirements:	6-8 neutral beam sources, at least one source from the 30, 210 and 150 beam-lines. 330LT highly desirable.
Diagnostic Requirements:	Standard profile diagnostics and fluctuation diagnostics, especially BES.
Analysis Requirements:
Other Requirements: