A set of twelve coils for resistive wall mode (RWM) stabilization were installed inside the DIII-D vacuum vessel. Rotational stabilization of the RWM was sustained for more than 2.5 s, with feedback-controlled error field correction. The required correction field was smaller than with the experimental coils, consistent with a better match to the mode spectrum of the error field, using the internal coils. The results show that the coils have allowed wall stabilization in plasmas with toroidal beta up to 6%, almost 50% greater than the no wall limit.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics