The first experimental demonstration of feedback suppression of rotating external kink modes near the ideal wall limit in a tokamak using Kalman filtering to discriminate the n = 1 kink mode from background noise is reported. In order to achieve the highest plasma pressure limits in tokamak fusion experiments, feedback stabilization of long-wavelength, external instabilities will be required, and feedback algorithms will need to distinguish the unstable mode from noise due to other magnetohydrodynamic activity. When noise is present in measurements of a system, a Kalman filter can be used to compare the measurements with an internal model, producing a realtime, optimal estimate for the system's state. For the work described here, the Kalman filter contains an internal model that captures the dynamics of a rotating, growing instability and produces an estimate for the instability's amplitude and spatial phase. On the High Beta Tokamak-Extended Pulse (HBT-EP) experiment, the Kalman filter algorithm is implemented using a set of digital, field-programmable gate array controllers with 10 microsecond latencies. The feedback system with the Kalman filter is able to suppress the external


    Zugriff

    Download


    Exportieren, teilen und zitieren



    Titel :

    A Kalman Filter for Active Feedback on Rotating External Kink Instabilities in a Tokamak Plasma


    Beteiligte:
    Hanson, Jeremy (Autor:in)

    Erscheinungsdatum :

    2009-05-01


    Anmerkungen:

    oai:zenodo.org:3779180



    Medientyp :

    Hochschulschrift


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Klassifikation :

    DDC:    629




    Kink Instabilities in a Magnetoplasmadynamic Thruster With and Without External Magnetic Field

    Paganucci, Fabrizio / Rossetti, Paola / Andrenucci, Mariano et al. | AIAA | 2004


    Further Experimental Evidences of the Development of Kink Instabilities in MPD Thrusters

    Paganucci, Fabrizio / Agostini, Matteo / Andrenucci, Mariano et al. | AIAA | 2005


    Further Experimental Evidences of the Development of Kink Instabilities in MPD Thrusters

    Paganucci, F. / Bonomo, F. / Zuin, M. et al. | British Library Conference Proceedings | 2005



    Kalman Filter Engineering

    Grewal, Mohinder S. / Weill, Lawrence R. / Andrews, Angus P. | Wiley | 2000