Development of State-Space Model-Based Kalman Filter for n>=1 Resistive Wall Mode (RWM)
Division of Plasma Physics (DPP) Annual Meeting of the American Physical Society (APS)
Orlando, Florida, November 12-16, 2007
Abstract |
While significant progress has been made for n =1 RWM identification
and control, it is now predicted that n > 1 RWMs could appear even
after the n =1 RWM is suppressed. Algorithm development, as well as
diagnostic capability enhancement, is being done in order to identify
the n = 2 or 3 RWMs in the presence of a stabilized n =1 RWM for
DIII-D. Specifically, taking advantage of the successful development
of the Kalman filter to discriminate ELM noise from an n =1 RWM [1], a
more advanced Kalman filter is being developed to detect both n=1 and
n > 1 RWMs. Noise characterization and modeling is deemed critical to
determine the optimized Kalman gain. This multi-mode state-space model
will also serve as a basis to design a model-based RWM feedback
controller.
[1] Y. In et al., Phys. Plasmas 13, 062512 (2006).