1,721,136 research outputs found
Current, position, and shape control of Tokamak plasmas: a literature review
No full textWe present a survey of the recent literature papers dealing with the problem of designing a feedback control system for controlling the position, current, and shape of a tokamak plasma. Because of the intrinsic distributed parameter nature of this system, its dynamics are described by a set of partial differential equations (PDEs) that cannot be directly used for the controller design. Therefore, the progress of the plasma control during the last two decades has been determined, on the one hand, by the capacity of the process experts to generate more and more reliable ordinary differential equations (ODEs) approximate models of these dynamics, and, on the other hand, by the ability of the control specialists to use these models as a basis for model-based control design. In this paper we present a survey of the various approximate models proposed in the literature, focusing on the simplifying assumptions adopted and the controllers proposed. Prior to the literature survey we give an introduction and illustrate a general form of the PDEs describing the plasma dynamics
Magnetic control of plasma current, position, and shape in Tokamaks - A survey of modeling and control approaches
No full textPlasma current, position and shape control systems and modeling approaches were reviewed. The literature was divided into three categories, namely plasma radial position and current control, vertical stabilization of elongated plasmas, and plasma shape control. The plasma current and radial position control problem can be easily solved using a filament plasma model - the Shafarov lumped parameter equation and two separate PID controllers. At most, a MIMO controller can be used if decoupling is desired. Stabilization of the plasma vertical motion requires new control strategies in which the control algorithm is changed on the basis of an estimate of the measurement accuracy. For controlling the shape during the plasma formation and start-up phase, controllers based on magnetic flux control are useful when control requirements are not stringent
Optimal Controllers for Stabilization of Plasma Vertical Position in an Elongated Tokamak
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