Control System Optimization Techniques for Real-Time Applications in Fusion Plasmas: The RFX-mod Experience

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Abstract
A series of techniques is presented that has been developed to optimize the output magnetic field of the feedback control system on the RFX-mod reversed field pinch device. With the aim of minimizing the harmonic distortion and correcting localized error fields, these methods should be lightweight for real-time application and effective in improving the performance of a system that is routinely used for active control of magnetohydrodynamic plasma instabilities. The implementation of simple, linear algebra based, real-time optimization methods will be described along with proof of the beneficial effects sought. The focus of this paper is set on a spurious harmonics reduction technique based on the decoupling of sensors and actuators; a description of its derivation will be given together with the implementation in the control loop. A similar procedure for the compensation of faulted actuators will also be mentioned.
Funding Information
  • Ministero dellIstruzione, dellUniversità e della Ricerca (2010SPS9B3)
  • European Union Horizon 2020 Research and Innovation Programme (633053)

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