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Tearing Mode Dynamics In Tokamak Plasmas
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Book Synopsis Tearing Mode Dynamics in Tokamak Plasmas by : Richard Fitzpatrick
Download or read book Tearing Mode Dynamics in Tokamak Plasmas written by Richard Fitzpatrick and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of humankind's ultimate energy source, nuclear fusion, has proceeded slowly but surely over the course of the last 60 years. This comprehensive book aims to outline a realistic, comprehensive, self-consistent, analytic theory of tearing mode dynamics in tokamak plasmas. It discusses a fluid theory of a highly magnetized plasma that treats the electrons and ions as independent fluids, and then proceeds to develop the theory of tearing modes, first approximating the geometry of a tokamak plasma as a periodic cylinder, but eventually considering the toroidal structure of real tokamak plasmas. This book also describes the stability of tearing modes, the saturation of such modes, and the evolution of their phase velocity due to interaction with other tearing modes, as well as the resistive vacuum vessel, and imperfections in the tokamak's magnetic field. This text will appeal to scientists and graduate students engaged in nuclear fusion research, and would make a useful reference for graduate plasma physics courses. Part of IOP Series in Plasma Physics.
Book Synopsis Tearing Mode Dynamics in Tokamak Plasmas by : Nikolaos Vergos
Download or read book Tearing Mode Dynamics in Tokamak Plasmas written by Nikolaos Vergos and published by . This book was released on 2016 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most problematic instabilities in tokamak plasmas is tearing modes; they are driven by current and pressure gradients, and involve a reconfiguration of the magnetic and velocity fields localized into a narrow region located at a resonant magnetic surface. While the equilibrium magnetic field lines are located on concentric nested toroidal flux surfaces, the instability creates magnetic islands in which field lines connect flux tubes together, allowing for a high radial heat transport, and, thus, resulting in a loss of confinement, and, potentially, disruptions. In order for the magnetic field lines to break and reconnect, we need to take into account the resistivity of the plasma and solve the resistive magnetohydrodynamics (MHD) equations. The analytical solution consists of a boundary layer analysis (asymptotic matching) and takes advantage of the small radial width of the region where the perturbations vary significantly. Indeed, ideal magnetohydrodynamics can be used everywhere except in that narrow region where the full resistive problem must be solved. This dissertation addresses two related problems in the study of resistive tearing modes, and their interactions with externally induced resonant magnetic perturbations (error-fields). First, an in-depth investigation of the bifurcated states of a rotating, quasi-cylindrical, tokamak plasma in the presence of a resonant error-field is performed, within the context of constant-[greek letter psi] resistive MHD theory. The response of the rotating plasma is studied in both the linear, and the nonlinear regime. In general, there is a "forbidden band" of tearing mode rotation frequencies that separates a branch of high-frequency solutions from a branch of low-frequency solutions. When a high-frequency solution crosses the upper boundary of the forbidden band there is a bifurcation to a low-frequency solution, and vice versa. Second, the analysis is extended to include the study of braking and locking of tearing mode rotation by the interaction of the mode with an error-field. It is found that this interaction can brake the plasma rotation, suppress magnetic island evolution and drive locked modes.
Book Synopsis Theory of Tokamak Plasmas by : R.B. White
Download or read book Theory of Tokamak Plasmas written by R.B. White and published by Elsevier. This book was released on 2017-01-31 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a graduate textbook on tokamak physics, designed to provide a basic introduction to plasma equilibrium, particle orbits, transport, and those ideal and resistive magnetohydrodynamic instabilities which dominate the behavior of a tokamak discharge, and to develop the mathematical methods necessary for their theoretical analysis.
Book Synopsis Stability of Tearing Modes in Tokamak Plasmas by : C.C. Hegna
Download or read book Stability of Tearing Modes in Tokamak Plasmas written by C.C. Hegna and published by . This book was released on 1994 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of Tearing Modes Via Electron Cyclotron Emission from Tokamak Plasmas by : Chuang Ren
Download or read book A Study of Tearing Modes Via Electron Cyclotron Emission from Tokamak Plasmas written by Chuang Ren and published by . This book was released on 1998 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of Tearing Modes Via Electron Cyclotron Emission from Tokamak Plasmas by :
Download or read book A Study of Tearing Modes Via Electron Cyclotron Emission from Tokamak Plasmas written by and published by . This book was released on 1998 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis studies several tearing mode problems from both theoretical and experimental points of view. A major part of this thesis is to demonstrate that Electron Cyclotron Emission (ECE) is an excellent diagnostic for studying an MHD mode structure and its properties in a tokamak plasma. It is shown that an MHD mode can be detected from the electron temperature fluctuations measured by ECE. The amplitude and phase profiles of the fluctuations contain detailed information about the mode structure. The ECE fluctuation phase profile indicates the magnetic island deformation due to the combination of sheared flow and viscosity. A model is presented to relate qualitatively the observed phase gradient to the local magnetic field, flow velocity shear and viscosity in a 2D slab geometry, using an ideal Ohm's law and the plasma momentum equation including flow and viscosity. Numerical solution of the resultant Grad-Shafranov-like equation describing the deformed island shows that the experimentally observed value of the phase gradient can be obtained under realistic parameters for the shear in the flow velocity and viscosity. A new approach to the tearing mode stability boundary and saturation level is also presented.
Book Synopsis Turbulent Stabilization of the Tearing Mode in Tokamak Plasmas by : E. Esarey
Download or read book Turbulent Stabilization of the Tearing Mode in Tokamak Plasmas written by E. Esarey and published by . This book was released on 1985 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Tearing Modes in Tokamak Plasmas with and Without Ion Beam Driven Currents by : Carl Göran Schultz
Download or read book Tearing Modes in Tokamak Plasmas with and Without Ion Beam Driven Currents written by Carl Göran Schultz and published by . This book was released on 1982 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stabilization of the Tearing Mode in Low Density Tokamak Plasmas by Turbulent Electron Diffusion by : E. Esarey
Download or read book Stabilization of the Tearing Mode in Low Density Tokamak Plasmas by Turbulent Electron Diffusion written by E. Esarey and published by . This book was released on 1982 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modelling Neoclassical Tearing Modes in Tokamak Plasmas by : Aleksandra Dudkovskaia
Download or read book Modelling Neoclassical Tearing Modes in Tokamak Plasmas written by Aleksandra Dudkovskaia and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stabilization of Neoclassical Tearing Modes in Tokamak Fusion Plasmas Via Extremum Seeking by : William P. Wehner
Download or read book Stabilization of Neoclassical Tearing Modes in Tokamak Fusion Plasmas Via Extremum Seeking written by William P. Wehner and published by . This book was released on 2009 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: The neoclassical tearing mode (NTM) instability produces magnetic islands in tokamak plasmas that can degrade confinement and lead to plasma disruptions. NTMs are driven by a lack of bootstrap current inside the magnetic island where the pressure profile is flattened. Suppression of these islands is necessary for sustained energy confinement and efficient operation in tokamak magnetic-fusion reactors. Compensating for the lack of bootstrap current by an Electron Cyclotron Current Drive (ECCD) has been proved experimentally as an effective method to stabilize NTMs. The effectiveness of this method is limited in practice by the uncertainties in the width of the island, the relative position between the island and the EC beam, and the EC power threshold for NTM stabilization. Heuristic Search and Suppress algorithms have been proposed and shown effective to improve the alignment of the EC beam with the island by just using an estimate of the island width. Making use of this estimate, a real-time, non-model-based, extremum-seeking optimization algorithm is proposed for EC beam steering and modulation in order to minimize the island-beam misalignment and the time (control energy) required for NTM stabilization. The efficiency of the proposed method is compared with traditional search and suppress algorithms. It is shown that the Extremum Seeking method has the potential of reducing NTM suppression times. In addition, it is shown that the Extremum Seeking method has the ability of modulating simultaneously other parameters beyond island-beam alignment that improve the effectiveness of the ECCD such as modulation duty-cycle and the phase mismatch between the ECCD and island O-point.
Book Synopsis Tearing Mode Stability of Tokamak Plasmas with Elliptical Cross Section by :
Download or read book Tearing Mode Stability of Tokamak Plasmas with Elliptical Cross Section written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of the ellipticity of the plasma cross section on tearing mode stability is investigated. The induced coupling between modes is shown to be destabilizing; however, the modification of the equilibrium tends to stabilize the tearing modes. The net effect depends on the manner in which the equilibrium is modified as the plasma cross-section shape is changed.
Book Synopsis Tearing Mode Stability in a Sheared Slab Model of the Tokamak Plasma by :
Download or read book Tearing Mode Stability in a Sheared Slab Model of the Tokamak Plasma written by and published by . This book was released on 2008 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Tearing Mode Activity in the Phaedrus-T Tokamak by : Binsheng Cui
Download or read book Tearing Mode Activity in the Phaedrus-T Tokamak written by Binsheng Cui and published by . This book was released on 1993 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigations in the Nonlinear Dynamics of Tokamak Plasmas by : Vladimir Lebedev
Download or read book Investigations in the Nonlinear Dynamics of Tokamak Plasmas written by Vladimir Lebedev and published by . This book was released on 1995 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stability of Tearing Modes in Tokamak Plasmas by :
Download or read book Stability of Tearing Modes in Tokamak Plasmas written by and published by . This book was released on 1994 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis On the Linear Theory of Drift Tearing Modes in a Tokamak Plasma by : D. Biskamp
Download or read book On the Linear Theory of Drift Tearing Modes in a Tokamak Plasma written by D. Biskamp and published by . This book was released on 1977 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt:
