Heat Transport Of A Temperature Filament In A Magnetized Plasma

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Heat Transport Of A Temperature Filament In A Magnetized Plasma

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Author : Meixuan Shi
language : en
Publisher:
Release Date : 2009

Heat Transport Of A Temperature Filament In A Magnetized Plasma written by Meixuan Shi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.

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.

Thermal Conductivity 24 Thermal Expansion 12

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Author : Peter S. Gaal
language : en
Publisher: CRC Press
Release Date : 1999-01-11

Thermal Conductivity 24 Thermal Expansion 12 written by Peter S. Gaal and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-01-11 with Technology & Engineering categories.

Experiments On Cross Magnetic Field Heat Transport In Magnetized Pure Electron Plasmas

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Author : Kurt Anthony Thompson
language : en
Publisher:
Release Date : 2020

Experiments On Cross Magnetic Field Heat Transport In Magnetized Pure Electron Plasmas written by Kurt Anthony Thompson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.

In this dissertation we present measurements of cross-magnetic-field heat transport in pure electron plasmas confined within a cylindrical Penning-Malmberg Trap. The measured heat transport is dominated by "long-range collisions", which are not included in classical transport theory. Most significantly, long-range collisions are observed to cause heat transport which is $\it{independent \ of \ the \ magnetic \ field}$, as opposed to classical theory which scales as $B^{-2}$. Modern theory predicts that long-range collisions are effective up to a Debye length, and thereby predicts transport rates which agree with the present measurements to within $50\%$. Experimentally, the electron plasma temperature is obtained versus radius and time by a newly-developed technique which measures the charge which escapes past controlled end-trapping barriers. We describe the technique in detail including the data collection, analysis and calibration. The method is validated via several experiments of the temporal evolution of the radial temperature profile including heating due to asymmetry-induced radial expansion, cooling due to cyclotron radiation and heating due to separatrix-crossing dissipation. The temperature diagnostic is shown to be robust and capable of obtaining spatial temperature resolution on the order of the Debye length. The technique is applicable to a variety of nonneutral plasma traps enabling temperature diagnostics for previously inaccessible experiments. From the measured density $n(r,t)$ and temperature $T(r,t)$ data, heat transport is analyzed as diffusion due to random particle collisions, convection due to bulk plasma flow, plus source terms consisting of Joule heating and cyclotron cooling. From these experiments we determine the cross-field thermal diffusivity, which we measure over a range of axial magnetic fields from $1

Parallel Heat Transport In Magnetized Plasma

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Author : Mukta Sharma
language : en
Publisher:
Release Date : 2013

Parallel Heat Transport In Magnetized Plasma written by Mukta Sharma and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.

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.

Turbulent Transport In Magnetized Plasmas Second Edition

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Author : Horton, Jr C Wendell
language : en
Publisher: #N/A
Release Date : 2017-07-21

Turbulent Transport In Magnetized Plasmas Second Edition written by Horton, Jr C Wendell and has been published by #N/A this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-07-21 with Science categories.

For a few seconds with large machines, scientists and engineers have now created the fusion power of the stars in the laboratory and at the same time find the rich range of complex turbulent electromagnetic waves that transport the plasma confinement systems. The turbulent transport mechanisms created in the laboratory are explained in detail in the second edition of "Turbulent Transport in Magnetized Plasmas" by Professor Horton. The principles and properties of the major plasma confinement machines are explored with basic physics to the extent currently understood. For the observational laws that are not understood — the empirical confinement laws — offering challenges to the next generation of plasma students and researchers — are explained in detail. An example, is the confinement regime — called the "I–mode" — currently a hot topic — is explored. Numerous important problems and puzzles for the next generation of plasma scientists are explained. There is growing demand for new simulation codes utilizing the massively parallel computers with MPI and GPU methods. When the 20 billion dollar ITER machine is tested in the 2020ies, new theories and faster/smarter computer simulations running in near real-time control systems will be used to control the burning hydrogen plasmas.

The Physics Of Laser Plasmas And Applications Volume 2

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Author : Hideaki Takabe
language : en
Publisher: Springer Nature
Release Date :

The Physics Of Laser Plasmas And Applications Volume 2 written by Hideaki Takabe and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.

Fusion Energy Update

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Author :
language : en
Publisher:
Release Date : 1982-04

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 1982-04 with Controlled fusion categories.