Runaway Electrons in Disruptions and Perturbed Magnetic Topologies of Tokamak Plasmas PDF Download
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Author: Michael Forster
Publisher:
ISBN:
Category :
Languages : en
Pages : 151
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Author: Michael Forster
Publisher:
ISBN:
Category :
Languages : en
Pages : 151
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Author: Michael Forster
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Brian Cornille
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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This dissertation presents results from two topics in tokamak disruption modeling. The first usessimulation to elucidate the observations from MST tokamak disharge experiments on suppression of runaway electrons (RE) with resonant magnetic perturbations (RMP). When applying RMPs having a single poloidal harmonic, an m = 1 RMP does not suppress RE while and m = 3 RMP achieves full suppression [Munaretto et al., Nuclear Fusion 60, 046024 (2020)]. Magnetohydrody- namics (MHD) simulation of the experiment indicates that the m = 3 RMP produces a substantial region of chaotic magnetic fields whereas the m = 1 RMP produces negligible changes in field topology compared to no RMP. Using snapshots of the MHD simulation fields, full-orbit relativis- tic electron test particle computations show [approximately equal to] 50% loss from the m = 3 RMP compared to the 10 -15% loss from the m = 1 RMP. Test particle computations of the m = 3 RMP case in the time-evolving MHD simulation fields show correlation between MHD activity and enhanced particle losses, but finds similar total electron confinement and field snapshots. The second topic presents a novel enhancement to vertical displacement computations in NIMROD [Sovinec et al., J. Comput. Phys. 195, 355 (2004)]. We present development of a quasi-static meshed vacuum region approach for treatment of computations with a resistive wall representation. With this approach a magnetostatic problem is solved for an external vacuum region while coupled through a thin-wall approximation to the implicit time advance of the plasma. Verification of the implementation is presented along with demonstration of its increased robustness in challenging geometries compared to the incumbent implementation.
Author: Henning Stoschus
Publisher: Forschungszentrum Jülich
ISBN: 3893367187
Category :
Languages : en
Pages : 141
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Author: Sundaresan Sridhar
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Tokamaks are the devices currently closest to achieve nuclear fusion power and disruptions are unfavorable events in which the plasma energy is lost in a very short timescale causing damage to tokamak structures. RE beams are one of the consequence of disruptions and they carry the risk of in-vessel component damage. Thus, the prevention and control of the RE are of prime importance. The current strategy for runaway electrons is to avoid their generation by a massive material injection (MMI). If their generation cannot be avoided, a 2nd MMI will be used to mitigate the generated RE beam. After the 1st MMI to prevent RE generation, a background plasma of 1st MMI impurities is formed which make the second MMI inefficient to mitigate RE beams inefficient, as observed in the JET tokamak. In this thesis, the physics of the interaction between the RE beam and the mitigation MMI in the presence of a cold background plasma is studied.
Author: Sadrilla Abdullaev
Publisher: Springer Science & Business Media
ISBN: 3319018906
Category : Science
Languages : en
Pages : 422
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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.
Author: Steward Jay Zweben
Publisher:
ISBN:
Category : Plasma confinement
Languages : en
Pages : 578
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Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 612
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Author: Ingeborg Entrop
Publisher:
ISBN: 9789038609478
Category :
Languages : en
Pages : 183
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Author: Fredrik Andersson
Publisher:
ISBN: 9789172913615
Category : Nuclear fusion
Languages : en
Pages : 53
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