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	199: Reducing the tearing island detection time
Name:	Egemen Kolemen ekolemen@pppl.gov	Affiliation:	Princeton Plasma Physics Laboratory
Research Area:	Stability & Disruption Avoidance	Presentation time:	Requested
Co-Author(s):		ITPA Joint Experiment :	No
Description:	Last year, we showed that for tearing modes we suppressed before they reach the critical amplitude (knee level), it takes ~200 ms to suppress the mode. Once the size of the island is above this threshold, it takes an order of magnitude (~2 sec) longer to suppress the island. Also, late catch may impede the capability to stop the disruption. Last year, we used only the simple Mirnov fft amplitude for mode detection. Three new capabilities are suggested to detect the mode earlier: 1. Combine Mirnov and ECE diagnostics to isolate 2/1 NTM from sawteeth and other noise: Currently, a new high resolution ECE is being developed. We want to connect this system to the real-time PCS and look at the q=2 surface to spatially identify the source of the mode which will increase the minimum detection level. 2. Use frequency windowing to better detect NTM: Use knowledge of the 2/1 mode frequency range to search the mode of interest. This will reduce the noise from side bands.	ITER IO Urgent Research Task :	No
Experimental Approach/Plan:	Same as last year
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