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Title: Poloidal flux profile reconstruction from pointwise measurements via extended Kalman filtering in the DIII-D Tokamak

The accuracy of the internal states of a tokamak, which usually cannot be measured directly, is of crucial importance for feedback control of the plasma dynamics. A first-principles-driven plasma response model could provide an estimation of the internal states given the boundary conditions on the magnetic axis and at plasma boundary. However, the estimation would highly depend on initial conditions, which may not always be known, disturbances, and non-modeled dynamics. Here in this work, a closed-loop state observer for the poloidal magnetic flux is proposed based on a very limited set of real-time measurements by following an Extended Kalman Filtering (EKF) approach. Comparisons between estimated and measured magnetic flux profiles are carried out for several discharges in the DIII-D tokamak. The experimental results illustrate the capability of the proposed observer in dealing with incorrect initial conditions and measurement noise.
Authors:
 [1] ;  [1] ;  [1]
  1. Lehigh Univ., Bethlehem, PA (United States)
Publication Date:
Grant/Contract Number:
FC02-04ER54698
Type:
Accepted Manuscript
Journal Name:
IEEE Conference on Control Applications
Additional Journal Information:
Conference: 2015 IEEE Conference on Control Applications (CCA), Sydney, NSW (Australia), 21-23 Sep 2015; Journal ID: ISSN 1085-1992
Publisher:
IEEE
Research Org:
General Atomics, San Diego, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Toroidal magnetic fields; Magnetic flux; Tokamaks; Observers; Mathematical model; Plasma measurements
OSTI Identifier:
1378451