Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Investigation of MHD Instabilities in Conventional and Advanced Tokamak Scenarios on ASDEX Upgrade
Author: Investigation of MHD Instabilities in Conventional and Advanced Tokamak Scenarios on ASDEX Upgrade
Author: Valentin IgochineMagnetohydrodynamic 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 of Advanced Tokamak Scenarios
Author: H. A. HoltiesPublisher:
ISBN:
Category : Plasma (Ionized gases)
Languages : en
Pages : 15
Book Description
MHD Stability of Advanced Tokamak Scenarios with Reversed Central Current
Author: G. T. A. HuysmansPublisher:
ISBN:
Category : Plasma (Ionized gases)
Languages : en
Pages : 10
Book Description
Nuclear Fusion
Author: The MHD Stability Analysis of Type I ELMs in ASDEX Upgrade Tokamak
Author: Samuli SaarelmaPublisher:
ISBN: 9789512253098
Category :
Languages : en
Pages : 58
Book Description
Author: M. Schittenhelm
Author: Anja Maria Mück