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	96: Effect of Error Field Control Currents on Strike Point Splitting
Name:	Matthew Lanctot matthew.lanctot@science.doe.gov	Affiliation:	Department of Energy
Research Area:	Stability & Disruption Avoidance	Presentation time:	Not requested
Co-Author(s):	A. McLean	ITPA Joint Experiment :	No
Description:	Establish if a connection exists between the structure of the outer strike point (i.e. strike point splitting) and optimal error field correction.	ITER IO Urgent Research Task :	No
Experimental Approach/Plan:	Compare strike point splitting with Dimes TV with and without optimal error field correction in LSN discharges. Also consider a case with a 3D field that adds to the intrinsic n=1 error field. This scoping experiment can be done in a single LSN discharge. During flattop, vary the amplitude and phase of the n=1 EFC currents. Monitor strike point with Dimes TV.
Background:	3D magnetic fields are known to strongly modify the magnetic topology near the X-point. 3D effects on the X-point are also observed in vacuum and plasma response calculations. The degree of strike point splitting and non-axisymmetry may allow a new way to evaluate the quality of error field correction. Since most EFC experiments are done using biased up double-null discharges (to avoid ohmic H-mode), it is not possible to obtain Dimes TV data during these experiments. A shot is needed to vary EFC current in a LSN discharge.
Resource Requirements:
Diagnostic Requirements:	Dimes TV. Other divertor diagnostics are desirable.
Analysis Requirements:
Other Requirements: