Ideal MHD Stability of Tokamak Plasmas with Moderate and Low Aspect Ratio PDF Download
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Author: Andrey Martynov
Publisher:
ISBN:
Category :
Languages : en
Pages : 101
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Author: Andrey Martynov
Publisher:
ISBN:
Category :
Languages : en
Pages : 101
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Author: Hartmut Zohm
Publisher: John Wiley & Sons
ISBN: 3527412328
Category : Science
Languages : en
Pages : 254
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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.
Author: Jonathan Edward Menard
Publisher:
ISBN:
Category : Plasma density
Languages : en
Pages : 4
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Author: Jonathan Edward Menard
Publisher:
ISBN:
Category : National Spherical Torus Experiment (Project).
Languages : en
Pages : 8
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Author: Hollis Emmett Dalhed
Publisher:
ISBN:
Category : Tokamaks
Languages : en
Pages : 680
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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A study of the MHD stability properties of bean-shaped tokamak plasmas is presented. For ballooning modes, while increased indentation gives larger .beta. stable configurations, the existence and accessibility of the second stable region is sensitive to the pressure and safety factor profiles. The second stable region appears at lower .beta. values for large aspect ratio and moderately high q-values. Finite-Larmor-radius (FLR) kinetic effects can significantly improve the stability properties. For low q (
Author: Daniel Berger
Publisher:
ISBN:
Category :
Languages : en
Pages : 95
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Extensive numerical studies of ideal MHD instabilities have been carried out to gain insight into the parametric dependence of critical .beta.'s in tokamaks. The large number of interrelated equilibrium quantities involved in establishing a critical .beta. has demanded a careful, systematic survey in order to isolate this dependence. The results of this survey establish the scaling with geometrical quantities including aspect ratio, elongation, and triangularity in the parameter regimes appropriate for both current and reactor-sized plasmas. A moderate dependence on the pressure profile and a strong variation with the current profile is found. The principal result is that for aspect ratio R/a approximately equal to 3, critical .beta.'s are of the order of 2% for circular cross sections and 5% for plasmas with elongation K approximately equal to 2; somewhat higher values could be achieved with more optimal shaping. Finally, sequences of equilibria have been analyzed to compare critical .beta. as a function of toroidal mode number n. We conclude that the infinite-n analytic ballooning theory provides a sufficient condition for ideal MHD internal mode stability. Low-n free boundary modes appear to set a lower limit.
Author: Jonathan Edward Menard
Publisher:
ISBN:
Category : National Spherical Torus Experiment (Project)
Languages : en
Pages : 0
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Author: J. Manickam
Publisher:
ISBN:
Category :
Languages : en
Pages : 40
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