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	60: Effective NTM control in low torque plasmas
Name:	Ronald Prater prater@fusion.gat.com	Affiliation:	General Atomics
Research Area:	Stability & Disruption Avoidance	Presentation time:	Not requested
Co-Author(s):	W. Solomon, E. Kolemen, R. La Haye, F. Turco, A. Welander	ITPA Joint Experiment :	No
Description:	Determine whether narrow, accurately placed ECCD is more effective in avoiding NTMs in low torque discharges than broad ECCD.	ITER IO Urgent Research Task :	No
Experimental Approach/Plan:	Restore a low torque discharge that had 2/1 NTMs without ECH but no NTMs with broad ECH on. Then narrow the ECCD profile and determine the best location through scanning. Then see how little EC power can be used to fully avoid the NTM.
Background:	In past work, experimenters working on low torque high performance discharges have found that use of the ECH system is effective at avoiding NTMs, but it has not been clear what the physical effect is, and sometimes ECH works as well as ECCD, and in either case broadly spread profiles work sufficiently well. Because that addresses the problem, work hasn't been done to determine whether narrow, well placed ECCD might be more effective with lower power. The point of this proposal is to see whether properly located ECCD can be optimally effective.
Resource Requirements:	At least 5 gyrotrons.
Diagnostic Requirements:	The usual, plus ECEI.
Analysis Requirements:
Other Requirements: