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	258: Main-ion and impurity rotation in helium plasmas
Name:	Brian Grierson grierson@fusion.gat.com	Affiliation:	General Atomics
Research Area:	Plasma Rotation	Presentation time:	Not requested
Co-Author(s):	K.H. Burrell, J.A. Boedo, C. Chrystal, J.S. deGrassie, W.M. Solomon	ITPA Joint Experiment :	No
Description:	Recent measurements of main-ion toroidal rotation and inferred poloidal rotation in deuterium plasmas has displayed significant disagreement with neoclassical theory. The discrepancy with neoclassical is most significant at low collisionality, where ITER will operate. The aim of this proposal is to perform a sequence of discharges at low torque (intrinsic) with ECH H-modes, and simultaneously measure the helium and carbon toroidal and poloidal rotation with the standard CER system (carbon) and main-ion system (helium) for toroidal rotation, and the vertical and IN/OUT systems for poloidal rotation. This significantly extends the work of Grierson and deGrassie (PoP 2007). Theory by Diamond, McDevitt et. al. have established the framework for turbulent enhancement of poloidal rotation, and the extensive DIII-D fluctuation diagnostic set will be used to characterize the turbulence in these conditions and compare to theory of turbulent driven poloidal flow at low collisionality.	ITER IO Urgent Research Task :	No
Experimental Approach/Plan:	Establish dominantly helium plasmas and use deuterium balanced NBI blips for measurements. To be done in a sequence of shots varying Ip and Bt where measurements are done in ohmic and H-mode plasmas to obtain a range of collisionality.
Background:	Many measurements on DIII-D have displayed anomalous poloidal rotation of both impurities and main-ions (Solomon, Grierson, deGrassie). We need to determine if the magnitude of, and type of turbulence in these plasmas is sufficient to explain this historical discrepancy.
Resource Requirements:	One day. Helium plasmas, NBI 30LT, 210RT, 330LT. Turbulence diagnostics.
Diagnostic Requirements:	Complete CER coverage and full profiles. Turbulence characterization highly desirable.
Analysis Requirements:	CERFIT and complete kEFIT for modeling codes NCLASS, NEO, GTC-NEO. GYRO for turbulence levels.
Other Requirements: