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	239: Continuous Scan of NTV Torque Across Low Rotation Peak
Name:	Nikolas Logan ncl2128@columbia.edu	Affiliation:	Columbia University
Research Area:	Stability & Disruption Avoidance	Presentation time:	Requested
Co-Author(s):	E.J. Strait, J.K. Park, A. Cole	ITPA Joint Experiment :	No
Description:		ITER IO Urgent Research Task :	No
Experimental Approach/Plan:	This experiment should be performed after a passive (constant NBI torque) rotation scan establishes the capability of new 3D magnetics to measure electromagnetic torque imparted by non-resonant error fields. 1) Reproduce discharge parameters known to be near the previously observed peak (ex 138574) 2) Switch on non-kink-resonant error field, maintaining as much as possible plasma parameters (NB feedback for beta, gas-puffing/pumping, etc.). Rotate fields if necessary for clear magnetic signal of plasma response. 3) Use mix of co/counter NB to slowly - compared to a transport time scale ~[(vti/R0)(δ B/B0)2]-1 - scan plasma rotation past the NTV peak at low counter rotation.
Background:
Resource Requirements:	Co and counter beam feedback as well as careful density control. n=3 I-coils.
Diagnostic Requirements:
Analysis Requirements:	Initial Maxwell stress tensor integrated torques can be calculated in the time between shots to give a sense of how things look. TRANSP for all shots.
Other Requirements: