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Closed-loop direct parametric identification of magnetohydrodynamic normal modes spectra in EXTRAP-T2R reversed-field pinch
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.ORCID iD: 0000-0002-5259-0458
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
2009 (English)In: 2009 IEEE CONTROL APPLICATIONS CCA & INTELLIGENT CONTROL, 2009, 1449-1454 p.Conference paper, Published paper (Refereed)
Abstract [en]

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.
Series
IEEE International Conference on Control Applications, ISSN 1085-1992
Keyword [en]
RESISTIVE WALL MODES, FEEDBACK-CONTROL, TOKAMAK PLASMA, STABILIZATION, SHELL
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-25561ISI: 000279628300245Scopus ID: 2-s2.0-74049145778ISBN: 978-1-4244-4601-8 (print)OAI: oai:DiVA.org:kth-25561DiVA: diva2:370929
Conference
IEEE International Conference on Control Applications/International Symposium on Intelligent Control St Petersburg, RUSSIA, JUL 08-10, 2009
Note
QC 20110216Available from: 2010-11-18 Created: 2010-10-27 Last updated: 2011-02-16Bibliographically approved
In thesis
1. Closed-loop control and identification of resistive shell magnetohydrodynamics for the reversed-field pinch
Open this publication in new window or tab >>Closed-loop control and identification of resistive shell magnetohydrodynamics for the reversed-field pinch
2010 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

It is demonstrated that control software updates for the magnetic confinement fusion experiment EXTRAP T2R can enable novel studies of plasma physics. Specifically, it is shown that the boundary radial magnetic field in T2R can be maintained at finite levels by feedback. System identification methods to measure in situ magnetohydrodynamic stability are developed and applied with encouraging results. Subsequently, results from closed-loop identification are used for retooling the T2R regulator. The track of research here pursued could possibly be relevant for future thermonuclear fusion reactors.

Publisher
78 p.
Series
Trita-EE, ISSN 1653-5146 ; 2010:019
National Category
Fusion, Plasma and Space Physics Control Engineering
Identifiers
urn:nbn:se:kth:diva-12794 (URN)978-91-7415-644-7 (ISBN)
Presentation
2010-05-26, E1, KTH, Lindstedtsvägen 3, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100518Available from: 2010-05-18 Created: 2010-05-11 Last updated: 2012-03-21Bibliographically approved

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Brunsell, Per

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