Author: S. C. JardinPublisher:
ISBN:
Category :
Languages : en
Pages : 12
Book Description
Feedback Stabilization of Axisymmetric Modes in Tokamaks
Author: S. C. JardinFeedback Stabilization of Axisymmetric Modes in Tokamaks
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Noncircular tokamak plasmas can be unstable to ideal MHD axisymmetric instabilities. Passive conductors with finite resistivity will at best slow down these instabilities to the resistive (L/R) time of the conductors. An active feedback system far from the plasma which responds on this resistive time can stabilize the system provided its mutual inductance with the passive coils is small enough.
Studies of Feedback Stabilization of Axisymmetric Modes in Deformable Tokamak Plasmas
Author: David John WardTSC Simulation of Feedback Stabilization of Axisymmetric Modes in Tokamaks Using Driven Halo Currents
Author: S. C. JardinPublisher:
ISBN:
Category : Tokamaks
Languages : en
Pages : 21
Book Description
Active Feedback Stabilization of Axisymmetric Modes in Highly Elongated Tokamak Plasmas
Author: D.J. WardThe Effects of Plasma Deformability on the Feedback Stabilization of Axisymmetric Modes in Tokamak Plasmas
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 55
Book Description
The effects of plasma deformability on the feedback stabilization of axisymmetric modes of tokamak plasmas are studied. It is seen that plasmas with strongly shaped cross sections have unstable motion different from a rigid shift. Furthermore, the placement of passive conductors is shown to modify the non-rigid components of the eigenfunction in a way that reduces the stabilizing eddy currents in these conductors. Passive feedback results using several equilibria of varying shape are presented. The eigenfunction is also modified under the effects of active feedback. This deformation is seen to depend strongly on the position of the flux loops which are used to determine plasma vertical position for the active feedback system. The variations of these non-rigid components of the eigenfunction always serve to reduce the stabilizing effect of the active feedback system by reducing the measurable poloidal flux at the flux-loop locations. Active feedback results are presented for the PBX-M tokamak configuration.
TSC Simulation of Feedback Stabilization of Axisymmetric Modes in Tokamaks Using Driven Halo Currents
Author: S. C. JardinPublisher:
ISBN:
Category : Tokamaks
Languages : en
Pages : 21
Book Description
The Effects of Plasma Deformability on the Feedback Stabilization of Axisymmetric Modes in Tokamak Plasmas
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 55
Book Description
The effects of plasma deformability on the feedback stabilization of axisymmetric modes of tokamak plasmas are studied. It is seen that plasmas with strongly shaped cross sections have unstable motion different from a rigid shift. Furthermore, the placement of passive conductors is shown to modify the non-rigid components of the eigenfunction in a way that reduces the stabilizing eddy currents in these conductors. Passive feedback results using several equilibria of varying shape are presented. The eigenfunction is also modified under the effects of active feedback. This deformation is seen to depend strongly on the position of the flux loops which are used to determine plasma vertical position for the active feedback system. The variations of these non-rigid components of the eigenfunction always serve to reduce the stabilizing effect of the active feedback system by reducing the measurable poloidal flux at the flux-loop locations. Active feedback results are presented for the PBX-M tokamak configuration.
Feedback Stabilization of Axisymmetric Modes in the TCV Tokamak Using Active Coils Inside and Outside the Vacuum Vessel
Author: Magnetic Control of Tokamak Plasmas
Author: Marco AriolaPublisher: Springer Science & Business Media
ISBN: 1848003242
Category : Technology & Engineering
Languages : en
Pages : 170
Book Description
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 world’s 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.