Closed-loop direct parametric identification of magnetohydrodynamic normal modes spectra in EXTRAP-T2R reversed-field pinch
2009 (English)In: 2009 IEEE CONTROL APPLICATIONS CCA & INTELLIGENT CONTROL, 2009, 1449-1454 p.Conference paper (Refereed)
The reversed-field pinch (RFP) EXTRAP-T2R (T2R) is a plasma physics experiment with particular relevance for magnetic confinement fusion (MCF) research. T2R is very well equipped for investigations of magnetohydrodynamic (MHD) instabilities known as resistive-wall modes (RWMs), growing on a time-scale set by a surrounding non-perfectly conducting shell. The RWM instability is also subject of intense research in tokamak experiments (another MCF configuration). Recently, multiple RWMs have been stabilized in T2R using arrays of active (current-carrying) and sensor (voltage-measuring) coils equidistributed on the shell. In this paper, the MHD normal modes dynamics is probed in the required feedback operation by simultaneously, and pseudo-randomly, exciting the spectrum in the spatial sense. Spectra are then extracted by prediction-error minimization based on an observer that tracks dynamically aliased modes and the results thus obtained are related, and compared, to established linear MHD stability theory. This pioneer study at T2R is, arguably, appealling both to plasma physicists and automatic control staff.
Place, publisher, year, edition, pages
2009. 1449-1454 p.
, IEEE International Conference on Control Applications, ISSN 1085-1992
RESISTIVE WALL MODES, FEEDBACK-CONTROL, TOKAMAK PLASMA, STABILIZATION, SHELL
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:kth:diva-25561ISI: 000279628300245ScopusID: 2-s2.0-74049145778ISBN: 978-1-4244-4601-8OAI: oai:DiVA.org:kth-25561DiVA: diva2:370929
IEEE International Conference on Control Applications/International Symposium on Intelligent Control St Petersburg, RUSSIA, JUL 08-10, 2009
QC 201102162010-11-182010-10-272011-02-16Bibliographically approved