Using APCS for Plasma Vertical Control at TCV

Cruz, N.; Moret, J.-M.; Coda, S.; Paley, JI; Duval, B.P.; Rodrigues, A.P.; Piras, Francesco; Felici, F.; Correia, C.M.B.A.; Varandas, C.A.F.

doi:10.1109/tns.2011.2160203

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…Using the Einstein notation and replacing according to 2, the estimation of the plasma vertical position, the so-called observer, is defined by the static relation [11]: (7) where z is the position of the plasma column, is the position of the filaments of the plasma column and is the reference position of the plasma axis.…”

Section: Vertical Plasma Position Observermentioning

confidence: 99%

An Optimal Real-Time Controller for Vertical Plasma Stabilization

Cruz

Moret

Coda

et al. 2015

IEEE Trans. Nucl. Sci.

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Modern Tokamaks have evolved from the initial axisymmetric circular plasma shape to an elongated axisymmetric plasma shape that improves the energy confinement, which is one of the key factors to improve fusion reactor performance. However, the elongated plasma cross section introduces a vertical instability that requires a real-time feedback control loop to stabilize the plasma vertical position and velocity. At the Tokamak à Configuration Variable (TCV) in-vessel poloidal field coils driven by fast switching power supplies are used to stabilize highly elongated plasmas. TCV plasma experiments have used a PID algorithm based controller to correct the plasma vertical position. In late 2013 experiments a new optimal real-time controller was tested improving the stability of the plasma. This contribution describes the new optimal real-time controller developed. The choice of the model that describes the plasma response to the actuators is discussed. The high order model that is initially implemented needs the application of a mathematical order reduction and the validation of the new reduced model. The lower order model is used to derive the time optimal control law. A new method for the construction of the switching curves of a bang-bang controller is presented that is based on the state-space trajectories that optimize the time to target of the system. The final control algorithm and its implementation are described and preliminary experimental results are discussed.

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Section: Vertical Plasma Position Observermentioning

confidence: 99%

An Optimal Real-Time Controller for Vertical Plasma Stabilization

Cruz

Moret

Coda

et al. 2015

IEEE Trans. Nucl. Sci.

Self Cite

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show abstract

“…A set of coefficients are calculated to define the observer from a finite element set of plasma current filaments, using Green's functions, thus it is possible to calculate the magnetic field produced in the probes. The matrix is built with the set of probes that are going to be used in the measurements and inverted to obtain the observer coefficients [7] [8].…”

Section: Vertical Plasma Position Observermentioning

confidence: 99%

An optimal real-time controller for vertical plasma stabilization

Cruz

Moret

Coda

et al. 2014

2014 19th IEEE-NPSS Real Time Conference

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Abstract-Modern Tokamaks have evolved from the initial axisymmetric circular plasma shape to an elongated axisymmetric plasma shape that improves the energy confinement time and the triple product, which is a generally used figure of merit for the conditions needed for fusion reactor performance. However, the elongated plasma cross section introduces a vertical instability that demands a real-time feedback control loop to stabilize the plasma vertical position and velocity. At the Tokamak Configuration Variable (TCV) in-vessel poloidal field coils driven by fast switching power supplies are used to stabilize highly elongated plasmas. TCV plasma experiments have used a PID algorithm based controller to correct the plasma vertical position. In late 2013 experiments a new optimal real-time controller was tested improving the stability of the plasma.This contribution describes the new optimal real-time controller developed. The choice of the model that describes the plasma response to the actuators is discussed. The high order model that is initially implemented demands the application of a mathematical order reduction and the validation of the new reduced model. The lower order model is used to derive the time optimal control law. A new method for the construction of the switching curves of a bang-bang controller is presented that is based on the state-space trajectories that optimize the time to target of the system.A closed loop controller simulation tool was developed to test different possible algorithms and the results were used to improve the controller parameters.The final control algorithm and its implementation are described and preliminary experimental results are discussed.

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Development of real-time plasma analysis and control algorithms for the TCV tokamak using Simulink

Felici

Paley

et al. 2014

Fusion Engineering and Design

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Using APCS for Plasma Vertical Control at TCV

Cited by 3 publications

References 15 publications

An Optimal Real-Time Controller for Vertical Plasma Stabilization

An Optimal Real-Time Controller for Vertical Plasma Stabilization

An optimal real-time controller for vertical plasma stabilization

Development of real-time plasma analysis and control algorithms for the TCV tokamak using Simulink

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