Confinement of Relativistic Runaway Electrons in Tokamak Plasmas PDF Download
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Author: Ingeborg Entrop
Publisher:
ISBN: 9789038609478
Category :
Languages : en
Pages : 183
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Book Description
Author: Ingeborg Entrop
Publisher:
ISBN: 9789038609478
Category :
Languages : en
Pages : 183
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Book Description
Author: Roger Jozef Elisabeth Jaspers
Publisher:
ISBN: 9789038604749
Category :
Languages : en
Pages : 158
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 33
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Book Description
Author: Steward Jay Zweben
Publisher:
ISBN:
Category : Plasma confinement
Languages : en
Pages : 578
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Book Description
Author: Harry E. Mynick
Publisher:
ISBN:
Category :
Languages : en
Pages : 30
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Book Description
Author: United States. Department of Energy. Division of Magnetic Confinement Systems
Publisher:
ISBN:
Category : Fusion reactors
Languages : en
Pages : 124
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Some of the ramifications of the runaway population in tokamak experiments are investigated. Consideration is given both to the normal operating regime of tokamaks where only a small fraction of high energy runaways are present and to the strong runaway regime where runaways are thought to carry a significant portion of the toroidal current. In particular, the areas to be examined are the modeling of strong runaway discharges, single particle orbit characteristics of runaways, macroscopic beam-plasma equilibria, and stability against kink modes. A simple one-dimensional, time-dependent model has been constructed in relation to strong runaway discharges. Single particle orbits are analyzed in relation to both the strong runaway regime and the weak regime. The effects of vector E x vector B drifts are first considered in strong runaway discharges and are found to lead to a slow inward shrinkage of the beam. Macroscopic beam-plasma equilibria are treated assuming a pressureless relativistic beam with inertia and using an ideal MHD approximation for the plasma. The stability of a toroidal relativistic beam against kink perturbations is examined using several models. (MOW).
Author: Roy Alexander Tinguely
Publisher:
ISBN:
Category :
Languages : en
Pages : 258
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Book Description
In the Alcator C-Mod tokamak, a magnetic confinement fusion experiment, electrons are accelerated to relativistic energies -- on the order of tens of MeV -- during steady-state conditions of Ohmic, elongated, and diverted plasma discharges. These so-called "runaway" electrons emit synchrotron radiation in their direction of motion due to their gyration in the background toroidal magnetic field, with values of B0 ranging from 2.7 to 7.8 T at the plasma axis. Two spectrometers, a wide-view camera, and a polarimeter are used to measure time-evolving spectra, images, and polarization information, respectively, of the synchrotron radiation in the visible/near-infrared wavelength range, [lambda] ~~ 300-1000 nm. The kinetic equation solver Code [Landreman et al 2014 Comput. Phys. Commun., Stahl et al 2016 Nucl. Fusion] and synthetic diagnostic Soft [Hoppe et al 2018 Nucl. Fusion] are used to model the evolution of the runaway electron phase space distribution and to simulate the detected synchrotron emission, respectively. The major contributions of this thesis work to the fields of plasma physics and fusion energy research are the following: Spectral measurements are consistent with runaway electrons' attaining lower energies as the magnetic field increases, a positive sign for future high-field fusion devices. The runaway electron density profile and other spatiotemporal dynamics, such as increased radial transport due to magnetohydrodynamic activity, are inferred from the two-dimensional synchrotron intensity distributions captured in camera images. Finally, for the first time in a tokamak plasma experiment, polarized synchrotron light is used as a novel diagnostic of the pitch angle distribution of runaway electrons. For all three measurements, discrepancies between experiment and theory/simulation are identified, and opportunities for future work are presented.
Author:
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ISBN:
Category :
Languages : en
Pages :
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Book Description
High energy runaway electrons in the Oak Ridge tokamak ORMAK have been investigated through measurement of the bremsstrahlung produced when these electrons leave the discharge and strike the limiting aperture of the torus. The experimental results have been interpreted in terms of a classical single-particle model appropriate for collisionless particles in a tokamak, and it has been found that most of the confinement properties of high energy runaways in ORMAK can be understood on this basis. An experiment designed to directly test this model has disclosed an anomalous transport which has been described by a runaway diffusion coefficient D approximately 102 to 104 cm2/sec appropriate for runaways near the outside of the plasma. A discussion of the possible mechanisms for this anomalous transport is given.
Author: Sadrilla Abdullaev
Publisher: Springer Science & Business Media
ISBN: 3319018906
Category : Science
Languages : en
Pages : 422
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Book Description
This is the first book to systematically consider the modern aspects of chaotic dynamics of magnetic field lines and charged particles in magnetically confined fusion plasmas. The analytical models describing the generic features of equilibrium magnetic fields and magnetic perturbations in modern fusion devices are presented. It describes mathematical and physical aspects of onset of chaos, generic properties of the structure of stochastic magnetic fields, transport of charged particles in tokamaks induced by magnetic perturbations, new aspects of particle turbulent transport, etc. The presentation is based on the classical and new unique mathematical tools of Hamiltonian dynamics, like the action--angle formalism, classical perturbation theory, canonical transformations of variables, symplectic mappings, the Poincaré-Melnikov integrals. They are extensively used for analytical studies as well as for numerical simulations of magnetic field lines, particle dynamics, their spatial structures and statistical properties. The numerous references to articles on the latest development in the area are provided. The book is intended for graduate students and researchers who interested in the modern problems of magnetic stochasticity in magnetically confined fusion plasmas. It is also useful for physicists and mathematicians interested in new methods of Hamiltonian dynamics and their applications.
