Development of State-Space Model-Based Kalman Filter for n>=1 Resistive Wall Mode (RWM)
Y. In, J.S. Kim, J. Kim, D.A. Humphreys, G.L. Jackson, R.D. Johnson, R.J. La Haye, E.J. Strait, M.L. Walker, A.M. Garofalo, H. Reimerdes, M. Okabayashi, E. Schuster
Division of Plasma Physics (DPP) Annual Meeting of the American Physical Society (APS)
Orlando, Florida, November 12-16, 2007
Abstract
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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).