Author: Samuli SaarelmaPublisher:
ISBN: 9789512253098
Category :
Languages : en
Pages : 58
Book Description
The MHD Stability Analysis of Type I ELMs in ASDEX Upgrade Tokamak
Author: Samuli SaarelmaPublisher:
ISBN: 9789512253098
Category :
Languages : en
Pages : 58
Book Description
Magnetohydrodynamic Stability of Tokamaks
Author: Hartmut ZohmPublisher: John Wiley & Sons
ISBN: 3527412328
Category : Science
Languages : en
Pages : 254
Book Description
This book bridges the gap between general plasma physics lectures and the real world problems in MHD stability. In order to support the understanding of concepts and their implication, it refers to real world problems such as toroidal mode coupling or nonlinear evolution in a conceptual and phenomenological approach. Detailed mathematical treatment will involve classical linear stability analysis and an outline of more recent concepts such as the ballooning formalism. The book is based on lectures that the author has given to Master and PhD students in Fusion Plasma Physics. Due its strong link to experimental results in MHD instabilities, the book is also of use to senior researchers in the field, i.e. experimental physicists and engineers in fusion reactor science. The volume is organized in three parts. It starts with an introduction to the MHD equations, a section on toroidal equilibrium (tokamak and stellarator), and on linear stability analysis. Starting from there, the ideal MHD stability of the tokamak configuration will be treated in the second part which is subdivided into current driven and pressure driven MHD. This includes many examples with reference to experimental results for important MHD instabilities such as kinks and their transformation to RWMs, infernal modes, peeling modes, ballooning modes and their relation to ELMs. Finally the coverage is completed by a chapter on resistive stability explaining reconnection and island formation. Again, examples from recent tokamak MHD such as sawteeth, CTMs, NTMs and their relation to disruptions are extensively discussed.
Improved Analysis of Measured MHD Activity and the Use of Toroidicity Induced Alfvén Eigenmodes to Constrain Current Density Profile Reconstruction in the ASDEX Upgrade Tokamak
Author: Karl D. SassenbergPublisher:
ISBN:
Category : Nuclear engineering
Languages : en
Pages : 151
Book Description
In a tokamak plasma, knowledge of the thermal particle and supra-thermal ion populations, and their dynamics is essential for controlled operation as the plasma pressure and current gradients provide the energy required to trigger various types of (MagnetoHydroDynamic) MHD instabilities that act to degrade plasma control and performance. Therefore studying the behaviour of MHD instabilities will reveal considerable information about the various particle populations in the plasma. In particular, a sensitive and readily excitable class of MHD instability in a tokamak plasma is the Toroidicity induced Alfvén Eigenmode (TAE). This mode is excited by supra-thermal ions and its frequency depends on the magnetic field strength, mass density profile, safety factor and the major radius of a tokamak, making it a rich source of information. At ASDEX Upgrade plasma ions are accelerated to energies of 1MeV and higher by Ion Cyclotron Resonance Heating. The interactions between TAEs and the resulting supra-thermal ion population is used to infer the effects that TAEs will have on fusion-born {uF061}-particles in a thermonuclear fusion reactor. This is of paramount importance to ITER and any future fusion devices, as {uF061}-particles are envisioned to be the main source of energy used to maintain a burning plasma. The aim of this research was to characterise typically observed fast ion excited TAEs at ASDEX Upgrade, to study the stability of fast ion excited TAEs at ASDEX Upgrade, to demonstrate that such TAEs could be driven by ICRF (Ion Cyclotron Radio Frequency) beat waves, and to improve equilibrium reconstructions using TAE derived safety factor information. To this end all milestones were achieved demonstrating that the techniques developed to drive TAEs with ICRF beat waves provides the basis for a new diagnostic, which complements existing safety factor profile diagnostics.
MHD Stability for a Class of Tokamak Equilibria With Fixed Boundary
Author: W KernerPublisher: Legare Street Press
ISBN: 9781020788390
Category :
Languages : en
Pages : 0
Book Description
MHD Stability for a Class of Tokamak Equilibria with Fixed Boundary is a comprehensive study of the stability of tokamak plasmas. W Kerner provides an in-depth analysis of magnetohydrodynamics and discusses the stability of tokamak plasmas with a fixed boundary. This book is an essential reference for physicists and engineers working in the field of fusion energy. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Fusion Science and Technology
Author: MHD Stability Analysis of Small ELM Regimes in JET
Author: Iter Physics
Author: C Wendell Horton, JrPublisher: World Scientific
ISBN: 9814678686
Category : Science
Languages : en
Pages : 248
Book Description
The promise of a vast and clean source of thermal power drove physics research for over fifty years and has finally come to collimation with the international consortium led by the European Union and Japan, with an agreement from seven countries to build a definitive test of fusion power in ITER. It happened because scientists since the Manhattan project have envisioned controlled nuclear fusion in obtaining energy with no carbon dioxide emissions and no toxic nuclear waste products.This large toroidal magnetic confinement ITER machine is described from confinement process to advanced physics of plasma-wall interactions, where pulses erupt from core plasma blistering the machine walls. Emissions from the walls reduce the core temperature which must remain ten times hotter than the 15 million degree core solar temperature to maintain ITER fusion power. The huge temperature gradient from core to wall that drives intense plasma turbulence is described in detail.Also explained are the methods designed to limit the growth of small magnetic islands, the growth of edge localized plasma plumes and the solid state physics limits of the stainless steel walls of the confinement vessel from the burning plasma. Designs of the wall coatings and the special 'exhaust pipe' for spent hot plasma are provided in two chapters. And the issues associated with high-energy neutrons — about 10 times higher than in fission reactions — and how they are managed in ITER, are detailed.
Fusion Nucléaire
Author: Active Control of Magneto-hydrodynamic Instabilities in Hot Plasmas
Author: Valentin IgochinePublisher: Springer
ISBN: 3662442221
Category : Science
Languages : en
Pages : 350
Book Description
During the past century, world-wide energy consumption has risen dramatically, which leads to a quest for new energy sources. Fusion of hydrogen atoms in hot plasmas is an attractive approach to solve the energy problem, with abundant fuel, inherent safety and no long-lived radioactivity. However, one of the limits on plasma performance is due to the various classes of magneto-hydrodynamic instabilities that may occur. The physics and control of these instabilities in modern magnetic confinement fusion devices is the subject of this book. Written by foremost experts, the contributions will provide valuable reference and up-to-date research reviews for "old hands" and newcomers alike.
Author: M. S. Chance