Controlled magnetohydrodynamic mode sustainment in the reversed-field pinch: Theory, design and experiments
2009 (English)In: Fusion engineering and design, ISSN 0920-3796, Vol. 84, no 7-11, 1455-1459 p.Article in journal (Refereed) Published
A novel control system design for magnetohydrodynamic (MHD) resistive-wall mode (RWM) stabilization is developed from the viewpoint of process control. The engineering approach assumed consists of system identification, selection of feedback interconnections, and subsequently, associated feedback gain tuning. A design for general output tracking is devised, implemented and experimentally verified to be capable of sustaining MHD modes in the reversed-field pinch (RFP) machine EXTRAP-T2R. In principle, by active feedback. the plasma column boundary is forced to 'user-specified' helicities of prescribed amplitudes and phases. Experimental success is mainly attributed to careful identification of local magnetic field diffusion time-constants, and individual actuator channel peripheral dynamics. Addition of functionality and key features of this new MHD feedback system software might provide a versatile tool for experimental plasma dynamics and innovative MHD stability research.
Place, publisher, year, edition, pages
2009. Vol. 84, no 7-11, 1455-1459 p.
Fusion plasma physics, Magnetohydrodynamics, Resistive-wall modes, Automatic control, System identification, Process control, INTELLIGENT SHELL, FEEDBACK, STABILIZATION
IdentifiersURN: urn:nbn:se:kth:diva-12891DOI: 10.1016/j.fusengdes.2008.11.052ISI: 000268012700078ScopusID: 2-s2.0-67349189891OAI: oai:DiVA.org:kth-12891DiVA: diva2:319542
QC 201005182010-05-182010-05-182012-05-08Bibliographically approved