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Title	9: Test of Neoclassical Toroidal Viscosity theory using modulated I-coil currents
Name:	Keith Burrell Burrell@fusion.gat.com	Affiliation:	General Atomics
Research Area:	Plasma Rotation	Presentation time:	Not requested
Co-Author(s):	A. Garofalo, W.M. Solomon, S. Smith	ITPA Joint Experiment :	No
Description:	Use modulated I-coil currents to investigate the theory of braking of plasma toroidal rotation by non-resonant error fields	ITER IO Urgent Research Task :	No
Experimental Approach/Plan:	Modulate the I-coil currents to modulate the non-resonant drag on the plasma. Investigate the effects as a function of modulation frequency, background plasma rotation, collisionality and I-coil parity.
Background:	This experiment was given 1/2 day in 2008. Unfortunately, there were issues of machine cleanliness since it was run after an experiment with significant gas puffing. Accordingly, the QH-modes were poor. Attempts to perform this experiment in ELMing H-mode lead to locking of the ELM frequency to the I-coil modulation. Although this locking was a significant discovery, the ELM effects on the rotation masked the direct I-coil effects. We need to perform this experiment in high quality QH-mode plasmas, since this avoids the ELM problem while still allowing us to probe H-mode plasmas.
Resource Requirements:	I-coil system connected to create maximum nonresonant n=3 magnetic field. C-coil configured for error field correcton. QH-mode will require reversed plasma current.
Diagnostic Requirements:	All profile diagnostics. CER at high enough speed to have 10 samples per I-coil modulation period. Use both main ion and carbon CER measurements.
Analysis Requirements:	--
Other Requirements:	--