Author: Hans NordmanPublisher:
ISBN:
Category :
Languages : en
Pages : 20
Book Description
The Concept of Marginal Stability and Recent Experimental Results from the TFTR Tokamak
Author: Hans NordmanEnergy Research Abstracts
Author: 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.
Nuclear Fusion
Author: Turbulent Transport In Magnetized Plasmas (Second Edition)
Author: C Wendell Horton, JrPublisher: #N/A
ISBN: 9813225904
Category : Science
Languages : en
Pages : 522
Book Description
For a few seconds with large machines, scientists and engineers have now created the fusion power of the stars in the laboratory and at the same time find the rich range of complex turbulent electromagnetic waves that transport the plasma confinement systems. The turbulent transport mechanisms created in the laboratory are explained in detail in the second edition of 'Turbulent Transport in Magnetized Plasmas' by Professor Horton.The principles and properties of the major plasma confinement machines are explored with basic physics to the extent currently understood. For the observational laws that are not understood — the empirical confinement laws — offering challenges to the next generation of plasma students and researchers — are explained in detail. An example, is the confinement regime — called the 'I-mode' — currently a hot topic — is explored.Numerous important problems and puzzles for the next generation of plasma scientists are explained. There is growing demand for new simulation codes utilizing the massively parallel computers with MPI and GPU methods. When the 20 billion dollar ITER machine is tested in the 2020ies, new theories and faster/smarter computer simulations running in near real-time control systems will be used to control the burning hydrogen plasmas.
Experimental Results from the TFTR Tokamak
Author: Physics Briefs
Author: On the Dynamics of Turbulent Transport Near Marginal Stability
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
A general methodology for describing the dynamics of transport near marginal stability is formulated. Marginal stability is a special case of the more general phenomenon of self-organized criticality. Simple, one field models of the dynamics of tokamak plasma self-organized criticality have been constructed, and include relevant features such as sheared mean flow and transport bifurcations. In such models, slow mode (i.e. large scale, low frequency transport events) correlation times determine the behavior of transport dynamics near marginal stability. To illustrate this, impulse response scaling exponents (z) and turbulent diffusivities (D) have been calculated for the minimal (Burgers) and sheared flow models. For the minimal model, z= 1 (indicating ballastic propagation) and D[approximately](S[sub 0][sup 2])[sup 1/3], where S[sub 0][sup 2] is the noise strength. With an identically structured noise spectrum and flow with shearing rate exceeding the ambient decorrelation rate for the largest scale transport events, diffusion is recovered with z= 2 and D[approximately] (S[sub 0][sup 2])[sup 3/5]. This indicates a qualitative change in the dynamics, as well as a reduction in losses. These results are consistent with recent findings from[rho] scaling scans. Several tokamak transport experiments are suggested.
Scientific and Technical Aerospace Reports
Author: Tokamaks
Author: John WessonPublisher: Oxford University Press, USA
ISBN:
Category : Science
Languages : en
Pages : 704
Book Description
The tokamak is the principal tool in controlled fusion research. This book serves as an introduction to the subject and a basic reference for theory, definitions, equations, and experimental results. This second edition covers advances in the field as well as the extensive experimental progress in the ten years since the first edition was published.