Author: G. TiniosPublisher:
ISBN:
Category :
Languages : en
Pages : 32
Book Description
Model Reduction for Axisymmetric Tokamak Control
Author: G. TiniosModel Reduction for Tokamak Plasma Turbulence
Author: Camille GillotPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Optimal control of tokamak plasmas requires efficient and accurate prediction of heat and matter transport. Growing from kinetic resonant instabilities, turbulence saturates by involving many scales, from the small vortex up to the back-reaction on the density and temperature profiles. Self-organisation processes are of particular interest, encompassing spontaneous zonal flow genera- tion and transport by avalanche. First principle numerical simulation codes like GYSELA allow studying the gyro-kinetic evolution of the particle distribution function. The large model size and cost prompts the need for reduction. Removing velocity dimensions is the so-called collisionless closure problem for fluid equations. Earlier approaches are extended and generalised by calling to the dynamical systems and optimal control litterature. In particular, we apply the balanced truncation and rational interpolation to the one-dimensional linear VlasovPoisson problem. The interpolation method features a cheap and versatile formulation, opening the door to wider use for more complex phenomena. Quasi-linear theory is the reference model for turbulent effects. The GYSELA three-dimensional output is analysed to estimate the robustness of linear properties in turbulent filaments. Key quasi-linear quantities carry over to the non-linear regime. Effective velocities and shape of turbulent structures are computed, and match expected group velocities and linear eigenmode. Nevertheless, the turbulent potential spectrum must be specified externally to quasi- linear models. This results in radially travelling unstable linear solutions that share many properties of turbulent avalanches seen in numerical simulations.
Axisymmetric Control in Tokamaks
Author: David Allan HumphreysPublisher:
ISBN:
Category :
Languages : en
Pages : 510
Book Description
Fusion Technology
Author: Approximate Methods for Analyzing and Controlling Axisymmetric Instabilities of Elongated Tokamak Plasmas
Author: Eric Randall FrantzMagnetic 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.
Axisymmetric Equilibrium Models for Tokamak Plasmas
Author: Barbara Gloria EpsteinGeneration of Non-axisymmetric Scrape-off Layer Perturbations for Controlling Tokamak Edge Plasma Profiles and Stability
Author: 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
Scientific and Technical Aerospace Reports
Author: Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 376
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.