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Title	193: Magnetic perturbation amplitude scan to investigate RMP-induced damping of Zonal Flows
Name:	George McKee mckee@fusion.gat.com	Affiliation:	University of Wisconsin
Research Area:	Turbulence & Transport	Presentation time:	Requested
Co-Author(s):	M. Leconte*, P. Diamond**, Z. Yan *NFRI, Korea **UCSD/WCI	ITPA Joint Experiment :	No
Description:	Determine how RMPs modify the amplitude of Zonal Flows, in an L-mode plasma. [Michael Leconte (NFRI) will present remotely]	ITER IO Urgent Research Task :	No
Experimental Approach/Plan:	Establish L-mode plasma, and then do a basic characterization of turbulence and Zonal Flows/GAMs using BES system resonant and non-resonant magnetic perturbations are applied. A reference L-mode plasma is shot number [ ]. BES would be used to measure turbulence characteristics (150L steady and flat is desired beam configuration, 150R not on). Then ramp up and/or modulate the I-coil (MPs with resonant spectrum at the plasma edge q_95~3.5) current to a fixed value and keep a flat top of about 1-2 s. Do a basic characterization of turbulence and Zonal Flows/GAMs with BES. Repeat the operation for different values of the I-coil current.
Background:	Experiments on TEXTOR [Y. Xu et al NF 2011] showed a damping of GAM Zonal Flows by RMPs. A theory [Leconte and Diamond PoP 2012] predicts a linear scaling of Zonal Flow damping with the square of the RMP amplitude (assumed to be the vaccum amplitude i.e. I-coil) The proposed experiment investigates the ZF damping and the scaling.
Resource Requirements:	I-coils, n=3 even/odd parity configuration
Diagnostic Requirements:	BES, DBS, electrostatic probes
Analysis Requirements:	--
Other Requirements:	--