Magnetic Control of Tokamak Plasmas
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Magnetic Control of Tokamak Plasmas

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Alfredo Pironti
Advances in Industrial Control
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"The main topic of this monograph is the design of a feedback control system for magnetic fields to guarantee the plasma equilibrium inside a tokamak with a prescribed position and shape. Modelling and control details are presented, allowing the non-expert to understand the control problem. Starting from equations of magneto-hydro-dynamics, all the steps needed for the derivation of plasma state-space models are enumerated. The basics of electromagnetics are frequently recalled. The control problem is then described beginning with control of current and position - vertical and radial - and progressing to more challenging shape control. The solutions proposed vary from simple PIDS to more sophisticated MIMO controllers.
Plasma Modelling.- Plasma Modelling for Magnetic Control.- The Plasma Boundary and its Identification.- Plasma Control.- Plasma Magnetic Control Problem.- Plasma Position and Current Control at FTU.- Plasma Vertical Stabilization.- Plasma Shape Control for ITER.- Plasma Shape Control at TCV.- Plasma Shape Control at JET.
this part is supported by two useful appendices on some of the mathematical tools used and the physical units of plasma physics. State-space models, state observers, H control, and process simulations are some of the familiar techniques used by ? the authors to meet the demanding spatial control specifications for these processes; however, the research reported in the monograph is more that just simulation studies and proposals for possible future hypothetical controllers, for the authors have worked with some of the worlds leading existing tokamak facilities. Chapter 5, 8, and 9 respectively, give practical results of implementations of their control schemes on the FTU Tokamak (Italy), the TCV Tokamak (Switzerland), and the JET Tokamak (United Kingdom). Additionally, the authors present simulation results of their ideas for the control of the new tokamak proposed for the ITER project. In conclusion, being very aware that most control engineers will not be conversant with the complexities of tokamak nuclear fusion reactor control, the authors have taken special care to give a useful introduction to the background of nuclear fusion, the science of plasma physics and appropriate models in the first part of the monograph (Chapters 1 to 3). This introduction is followed by six chapters (4 to 9) of control studies. In Chapter 4, the generic control problem is established and then five case study chapters follow.