Active Feedback Stabilization of the Resistive Wall Mode on the DIII-D Device
A proof of principle magnetic feedback stabilization experiment has been carried out to suppress the resistive wall mode (RWM), a branch of the ideal magnetohydrodynamic (MHD) kink mode under the influence of a stabilizing resistive wall, on the DIII-D tokamak device. The RWM was successfully suppressed and the high beta duration above the no wall limit was extended to more than 50 times the resistive wall flux diffusion time. It was observed that the mode structure was well preserved during the time of the feedback application. Several lumped parameter formulations were used to study the feedback process. The observed feedback characteristics are in good qualitative agreement with the analysis. These results provide encouragement to future efforts towards optimizing the RWM feedback methodology in parallel to what has been successfully developed for the n = 0 vertical positional control. Newly developed MHD codes have been extremely useful in guiding the experiments and in providing possible paths for the next step.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 15004386
- Report Number(s):
- UCRL-JC-152981; TRN: US201015%%563
- Resource Relation:
- Journal Volume: 8; Journal Issue: 5; Conference: 42nd Annual Meeting of the American Physical Society Division of Plasma Physics, Quebec City, Canada, Nov 23 - Nov 27, 2000
- Country of Publication:
- United States
- Language:
- English
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