Classical Heat Transport And Spontaneous Fluctuations Associated With A Temperature Filament In A Magnetized Plasma
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Classical Heat Transport And Spontaneous Fluctuations Associated With A Temperature Filament In A Magnetized Plasma
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Author : Alexander Thomas Burke
language : en
Publisher:
Release Date : 1999
Classical Heat Transport And Spontaneous Fluctuations Associated With A Temperature Filament In A Magnetized Plasma written by Alexander Thomas Burke and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.
Magnetized Plasma Pressure Filaments
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Author : Scott Graham Karbashewski
language : en
Publisher:
Release Date : 2021
Magnetized Plasma Pressure Filaments written by Scott Graham Karbashewski and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with Plasma (Ionized gases) categories.
One of the prominent areas of interest in current plasma science is focused on understanding the mechanisms of heat transport beyond classical Coulomb collisions. The topic has applications in many areas of plasma physics, such as the solar corona and nuclear fusion devices. In strongly magnetized plasmas the thermal conductivity parallel to the magnetic field is numerically quite large and orders of magnitude larger than the transverse conductivity; thus, the effective study of heat transport in these conditions requires a large system that is much longer along the magnetic axis than across. In this thesis, results are presented from basic heat transport experiments using magnetized plasma pressure filaments. The experiments are performed in the Large Plasma Device (LAPD) at the Basic Plasma Science Facility (BaPSF) at the University of California, Los Angeles (UCLA). A cerium hexaboride crystal cathode injects low-energy electrons along a magnetic field into the centre of a preexisting, cold, quiescent plasma forming a hot electron filament embedded in a colder plasma. Previous experiments observed gradient-driven drift-Alfvén waves that lead to enhanced cross-field transport; and a spontaneous thermal diffusion wave that was speculated to meet a quarter-wave resonance of the filament length. In the first set of experiments, a low amplitude sinusoidal perturbation is added to the cathode discharge bias that creates an oscillating heat source capable of driving large amplitude electron temperature oscillations. Langmuir probes are used to measure the amplitude and phase of the thermal wave field over a wide range of driver frequencies. The results are used to verify the excitation of thermal waves in magnetized plasma and confirm the presence of thermal resonances of the filament. The diagnostic potential of thermal waves is demonstrated through measurement of the parallel thermal diffusivity and distinguishing between classical transport, drift-Alfvén growth, and turbulent transport regimes using the cross-field structure. Two models for the thermal wave field are investigated and used to describe the experiment results; a two-dimensional homogeneous model based on a Green function approach and a one-dimensional inhomogeneous model based on a classical mechanics approach using the Hamilton-Jacobi equation. The second set of experiments have used three crystal cathodes in a triangular configuration to investigate the interactions between multiple pressure filaments with varying separation distances. The results are used to establish the scale length of interaction between the filaments. Within an electron skin depth, enhanced cross-field transport from chaotic E × B mixing rapidly relaxes the gradients in the inner triangular region of the filaments and leads to the growth of global nonlinear drift-Alfvén modes that are driven by the thermal gradient in the outer region of the filament bundle. Linear stability analysis of the temperature, density, and transverse flow profiles is used to accurately predict the observed wave modes. Coupling between the global modes leads to large intermittent transport events that are characterized by exponential frequency spectra and Lorentzian-shaped pulses that are signatures of chaotic dynamics. Mode decomposition and conditional averaging are used to reconstruct the pulse events and demonstrate that they are driven by nonlinear interactions between drift-Alfvén wave modes. The time series analysis tools of the complexity-entropy plane and Hurst exponent are used to investigate the chaotic nature and memory of the intermittent fluctuations. Last, the addition of a sinusoidal driver to one of the filaments in the configuration facilitates driving of the drift-Alfvén modes. The driver is shown to synchronize with several eigenmodes at once due to the asymmetric perturbation.
Kinetic Alfv N Waves In Laboratory Space And Astrophysical Plasmas
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Author : De-Jin Wu
language : en
Publisher: Springer Nature
Release Date : 2020-01-07
Kinetic Alfv N Waves In Laboratory Space And Astrophysical Plasmas written by De-Jin Wu and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-01-07 with Science categories.
This book provides a systematic introduction to the observation and application of kinetic Alfven waves (KAWs) in various plasma environments, with a special focus on the solar-terrestrial coupling system. Alfven waves are low-frequency and long-wavelength fluctuations that pervade laboratory, space and cosmic plasmas. KAWs are dispersive Alfven waves with a short wavelength comparable to particle kinematic scales and hence can play important roles in the energization and transport of plasma particles, the formation of fine magneto-plasma structures, and the dissipation of turbulent Alfven waves. Since the 1990s, experimental studies on KAWs in laboratory and space plasmas have significantly advanced our understanding of KAWs, making them an increasingly interesting subject. Without a doubt, the solar–terrestrial coupling system provides us with a unique natural laboratory for the comprehensive study of KAWs. This book presents extensive observations of KAWs in solar and heliospheric plasmas, as well as numerous applications of KAWs in the solar-terrestrial coupling system, including solar atmosphere heating, solarwind turbulence, solar wind-magnetosphere interactions, and magnetosphere-ionosphere coupling. In addition, for the sake of consistency, the book includes the basic theories and physical properties of KAWs, as well as their experimental demonstrations in laboratory plasmas. In closing, it discusses possible applications of KAWs to other astrophysical plasmas. Accordingly, the book covers all the major aspects of KAWs in a coherent manner that will appeal to advanced graduate students and researchers whose work involves laboratory, space and astrophysical plasmas.
American Doctoral Dissertations
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Author :
language : en
Publisher:
Release Date : 1998
American Doctoral Dissertations written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Dissertation abstracts categories.
Documentation Of Plasma Physics Pt 1 Experimental Plasma Physics And Theoretical Plasma Physics
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Author :
language : en
Publisher:
Release Date : 1976
Documentation Of Plasma Physics Pt 1 Experimental Plasma Physics And Theoretical Plasma Physics written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Plasma (Ionized gases) categories.
Energy Transfer And Dissipation In Plasma Turbulence
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Author : Yan Yang
language : en
Publisher:
Release Date : 2019
Energy Transfer And Dissipation In Plasma Turbulence written by Yan Yang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Energy transfer categories.
This book revisits the long-standing puzzle of cross-scale energy transfer and dissipation in plasma turbulence and introduces new perspectives based on both magnetohydrodynamic (MHD) and Vlasov models. The classical energy cascade scenario is key in explaining the heating of corona and solar wind. By employing a high-resolution hybrid (compact finite difference & WENO) scheme, the book studies the features of compressible MHD cascade in detail, for example, in order to approximate a real plasma cascade as "Kolmogorov-like" and to understand features that go beyond the usual simplified theories based on incompressible models. When approaching kinetic scales where plasma effects must be considered, it uses an elementary analysis of the Vlasov-Maxwell equations to help identify the channels through which energy transfer must be dissipated. In addition, it shows that the pressure-strain interaction is of great significance in producing internal energy. This analysis, in contrast to many other recent studies, does not make assumptions about wave-modes, instability or other specific mechanisms responsible for the dynamics - the results are direct consequences of the Vlasov-Maxwell system of equations. This is an important step toward understanding dissipation in turbulent collisionless plasma in space and astrophysics.
The Plasma Boundary Of Magnetic Fusion Devices
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Author : P.C Stangeby
language : en
Publisher: CRC Press
Release Date : 2000-01-01
The Plasma Boundary Of Magnetic Fusion Devices written by P.C Stangeby and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000-01-01 with Science categories.
The Plasma Boundary of Magnetic Fusion Devices introduces the physics of the plasma boundary region, including plasma-surface interactions, with an emphasis on those occurring in magnetically confined fusion plasmas. The book covers plasma-surface interaction, Debye sheaths, sputtering, scrape-off layers, plasma impurities, recycling and control, 1D and 2D fluid and kinetic modeling of particle transport, plasma properties at the edge, diverter and limiter physics, and control of the plasma boundary. Divided into three parts, the book begins with Part 1, an introduction to the plasma boundary. The derivations are heuristic and worked problems help crystallize physical intuition, which is emphasized throughout. Part 2 provides an introduction to methods of modeling the plasma edge region and for interpreting computer code results. Part 3 presents a collection of essays on currently active research hot topics. With an extensive bibliography and index, this book is an invaluable first port-of-call for researchers interested in plasma-surface interactions.
Fusion Energy Update
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Author :
language : en
Publisher:
Release Date : 1981
Fusion Energy Update written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Controlled fusion categories.
Introduction To Plasma Physics And Controlled Fusion
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Author : Francis F. Chen
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-03-09
Introduction To Plasma Physics And Controlled Fusion written by Francis F. Chen and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-03-09 with Science categories.
TO THE SECOND EDITION In the nine years since this book was first written, rapid progress has been made scientifically in nuclear fusion, space physics, and nonlinear plasma theory. At the same time, the energy shortage on the one hand and the exploration of Jupiter and Saturn on the other have increased the national awareness of the important applications of plasma physics to energy production and to the understanding of our space environment. In magnetic confinement fusion, this period has seen the attainment 13 of a Lawson number nTE of 2 x 10 cm -3 sec in the Alcator tokamaks at MIT; neutral-beam heating of the PL T tokamak at Princeton to KTi = 6. 5 keV; increase of average ß to 3%-5% in tokamaks at Oak Ridge and General Atomic; and the stabilization of mirror-confined plasmas at Livermore, together with injection of ion current to near field-reversal conditions in the 2XIIß device. Invention of the tandem mirror has given magnetic confinement a new and exciting dimension. New ideas have emerged, such as the compact torus, surface-field devices, and the EßT mirror-torus hybrid, and some old ideas, such as the stellarator and the reversed-field pinch, have been revived. Radiofrequency heat ing has become a new star with its promise of dc current drive. Perhaps most importantly, great progress has been made in the understanding of the MHD behavior of toroidal plasmas: tearing modes, magnetic Vll Vlll islands, and disruptions.
Physics Briefs
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Author :
language : en
Publisher:
Release Date : 1994
Physics Briefs written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Physics categories.