Predictor-based multivariable closed-loop system identification of the EXTRAP T2R reversed field pinch external plasma response
2011 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 53, no 8, 084003- p.Article in journal (Refereed) Published
The usage of computationally feasible overparametrized and nonregularized system identification signal processing methods is assessed for automated determination of the full reversed-field pinch external plasma response spectrum for the experiment EXTRAP T2R. No assumptions on the geometry of eigenmodes are imposed. The attempted approach consists of high-order autoregressive exogenous estimation followed by Markov block coefficient construction and Hankel matrix singular value decomposition. It is seen that the obtained 'black-box' state-space models indeed can be compared with the commonplace ideal magnetohydrodynamics (MHD) resistive thin-shell model in cylindrical geometry. It is possible to directly map the most unstable autodetected empirical system pole to the corresponding theoretical resistive shell MHD eigenmode.
Place, publisher, year, edition, pages
2011. Vol. 53, no 8, 084003- p.
RESISTIVE-WALL MODES; SUBSPACE IDENTIFICATION; INTELLIGENT SHELL; TOKAMAK
Fusion, Plasma and Space Physics Control Engineering
IdentifiersURN: urn:nbn:se:kth:diva-35113DOI: 10.1088/0741-3335/53/8/084003ISI: 000291207300007ScopusID: 2-s2.0-79961047060OAI: oai:DiVA.org:kth-35113DiVA: diva2:428590
QC 201106302011-06-302011-06-202012-05-09Bibliographically approved