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Author : J. Paméla
Publisher :
ISBN 13 :
Total Pages : 6 pages
Book Rating : 4.:/5 (316 download)
Download or read book Turbulent Particle Transport in Magnetized Plasmas written by J. Paméla and published by . This book was released on 2004* with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : C Wendell Horton, Jr
Publisher : #N/A
ISBN 13 : 9813225904
Total Pages : 522 pages
Book Rating : 4.8/5 (132 download)
Download or read book Turbulent Transport In Magnetized Plasmas (Second Edition) written by C Wendell Horton, Jr and published by #N/A. This book was released on 2017-07-21 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : Xiangrong Fu
Publisher :
ISBN 13 :
Total Pages : 306 pages
Book Rating : 4.:/5 (861 download)
Download or read book Turbulent Particle and Thermal Transport in Magnetized Plasmas written by Xiangrong Fu and published by . This book was released on 2013 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: The particle and thermal transport by low-frequency drift waves in magnetized plasmas are studied with theories and simulations. Universal in inhomogeneous plasmas, drift waves in Earth's ionosphere, the GAMMA-10 Tandem Mirror machine, the Columbia Linear Machine and C-Mod tokamak are studied in this thesis. The first investigations are E x B particle transport in the given electric and magnetic fields of the GAMMA-10 mirror machine at the University of Tsukuba in Japan. The results show that the formation of E [subscript r]-shear by local heating of electrons can reduced the radial particle loss. The turbulent impurity particle transport driven by various modes in the MIT tokamak Alcator C-Mod is studied by a quasilinear theory and compared to experimental measurement of Boron density profiles. A code is developed for solving eigensystems of drift wave turbulence equations for the multi-component fusion plasmas and calculating quasilinear particle fluxes. The calculations are much faster than nonlinear simulations and may be suitable for real-time analysis and feedback control of tokamak plasmas. The electron temperature gradient (ETG) mode is a candidate mechanism for anomalous electron thermal transport across various magnetic confinement geometries. This mode was produced in the Columbia Linear Machine (CLM) at Columbia University. Large scale simulations of the ETG mode in the CLM by a gyrokinetic code GTC are carried out on supercomputers at TACC and NERSC. The results show good agreement with experiments in the dominant mode number, wave frequencies and the radial structure. Some nonlinear properties are also analyzed using the code.
Author : Claude Wendell Horton
Publisher :
ISBN 13 : 9789813225893
Total Pages : 522 pages
Book Rating : 4.2/5 (258 download)
Download or read book Turbulent Transport in Magnetized Plasmas written by Claude Wendell Horton and published by . This book was released on 2017 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book explains how magnetized plasmas self-organize in states of electromagnetic turbulence that transports particles and energy out of the core plasma faster than anticipated by the fusion scientists designing magnetic confinement systems in the 20th.
Author : Radu Balescu
Publisher : CRC Press
ISBN 13 : 9781420034684
Total Pages : 498 pages
Book Rating : 4.0/5 (346 download)
Download or read book Aspects of Anomalous Transport in Plasmas written by Radu Balescu and published by CRC Press. This book was released on 2005-04-01 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt: Anomalous transport is a ubiquitous phenomenon in astrophysical, geophysical and laboratory plasmas; and is a key topic in controlled nuclear fusion research. Despite its fundamental importance and ongoing research interest, a full understanding of anomalous transport in plasmas is still incomplete, due to the complexity of the nonlinear phenomena involved. Aspects in Anomalous Transport in Plasmas is the first book to systematically consider anomalous plasma transport theory and provides a unification of the many theoretical models by emphasizing interrelations between seemingly different methodologies. It is not intended as a catalogue of the vast number of plasma instabilities leading to anomalous transport; instead it chooses a number of these and emphasizes the aspects specifically due to turbulence. After a brief introduction, the microscopic theory of turbulence is discussed, including quasilinear theory and various aspects of renormalization methods, which leads to an understanding of resonance broadening, mode coupling, trajectory correlation and clumps. The second half of the book is devoted to stochiastic tramsport, using methods based on the Langevin equations and on Random Walk theory. This treatment aims at going beyond the traditional limits of weak turbulence, by introducing the recently developed method of decorrelation trajectories, and its application to electrostatic turbulence, magnetic turbulence and zonal flow generation. The final chapter includes very recent work on the nonlocal transport phenomenon.
Author : Xin Wang
Publisher :
ISBN 13 :
Total Pages : 171 pages
Book Rating : 4.:/5 (15 download)
Download or read book Turbulent Particle Transport in H-Mode Plasmas on Diii-D written by Xin Wang and published by . This book was released on 2016 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: Particle transport is an important topic in plasma physics. It determines the density profile of a burning plasma within a tokamak a magnetic confinement device. Microscopic turbulent particle transport is two orders of magnitude larger than other transport mechanisms for electrons and small ions. In order to confine a plasma in a tokamak with a core density that exceeds the fusion criteria, it is essential to study turbulent particle transport. This thesis investigates how different plasma parameters such as the toroidal rotation and microscopic instabilities affect turbulent particle transport in the DIII-D tokamak. First, we show how toroidal rotation can indirectly affect particle transport, through its contribution to the radial electric field and thus the E B shearing rate. The plasma discharge which has best confinement is the one whose E B shearing rate is larger than or at least similar to the growth rates that drive turbulent transport at the plasma edge. Second, for the first time on DIII-D, we observe a correlation between electron density gradient and instability mode frequency in the plasma core. We find that, when the turbulence is driven by the ion temperature gradient (ITG), the local density gradient increases as the the absolute frequency of the dominant unstable mode decreases. Once the dominant unstable mode switches over to the trapped electron mode (TEM) regime, the local density gradient decreases again. As a result the density gradient reaches a maximum when the mode has zero frequency, which is corresponds to the cross over from ITG to TEM. This correlation opens a new opportunity for future large burning plasma devices such as ITER to increase the core density by controlling the turbulence regime. Finally, we show that, in low density regime, a reduction in core density is observed when electron cyclotron heating (ECH) is applied. This reduction is not the result of a change in turbulence regime nor the result of a change in the density gradient in the core. Through detailed time-dependent experimental analysis, linear gyro-kinetic simulations, and comparison to turbulence measurements we show that this reduction in core density is the result of an increase in turbulence drive at the plasma edge.
Author : C. Wendell Horton Jr
Publisher : World Scientific Publishing Company
ISBN 13 : 9789813225886
Total Pages : 507 pages
Book Rating : 4.2/5 (258 download)
Download or read book Turbulent Transport in Magnetized Plasmas written by C. Wendell Horton Jr and published by World Scientific Publishing Company. This book was released on 2017-06-02 with total page 507 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : Igor Rogachevskii
Publisher : Cambridge University Press
ISBN 13 : 1009008412
Total Pages : 272 pages
Book Rating : 4.0/5 (9 download)
Download or read book Introduction to Turbulent Transport of Particles, Temperature and Magnetic Fields written by Igor Rogachevskii and published by Cambridge University Press. This book was released on 2021-08-05 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulence and the associated turbulent transport of scalar and vector fields is a classical physics problem that has dazzled scientists for over a century, yet many fundamental questions remain. Igor Rogachevskii, in this concise book, systematically applies various analytical methods to the turbulent transfer of temperature, particles and magnetic field. Introducing key concepts in turbulent transport including essential physics principles and statistical tools, this interdisciplinary book is suitable for a range of readers such as theoretical physicists, astrophysicists, geophysicists, plasma physicists, and researchers in fluid mechanics and related topics in engineering. With an overview to various analytical methods such as mean-field approach, dimensional analysis, multi-scale approach, quasi-linear approach, spectral tau approach, path-integral approach and analysis based on budget equations, it is also an accessible reference tool for advanced graduates, PhD students and researchers.
Author : Saskia Mordijck
Publisher :
ISBN 13 : 9781124408507
Total Pages : 97 pages
Book Rating : 4.4/5 (85 download)
Download or read book Particle Transport as a Result of Resonant Magnetic Perturbations written by Saskia Mordijck and published by . This book was released on 2011 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis makes contributes to field of plasma physics with a particular focus on particle transport as a result of resonant magnetic perturbations (RPMs) in magnetic confinement devices (Tokamaks). RPMs have proven to be a useful technique to suppress edge localized modes (ELMs) that under certain conditions can damage the confinement device. In order to suppress ELMs, these magnetic perturbations are created to be be resonant at the edge of the plasma (i.e., by selecting an n=3 spectrum and a q95 = 3.6). However, RMPs lead to a changes in the density profile, not only in the pedestal area, but also deeper in the plasma core, limiting plasma performance. As a first contribution in this thesis we carefully investigate density pump-out, and show that it is the result of a change in particle transport (as opposed to a change in neutral fueling). A second contribution of this work is the introduction of a weighted magnetic diffusion coefficient (D/OFL) that allows us to make quantitative comparisons between experimental datasets from different Tokamak devices. By comparing D/OFL for MAST L-modes and DIII-D H-modes, we find that both machines exhibit a very different density pump-out for similar D/OFL values. Since turbulent particle transport is very different for L and H-modes, we investigate, as a third contribution of this work, the influence of RMPs on turbulent particle transport in both MAST and DIII-D. We find that while an increase in turbulent transport on MAST correlates well with density pump-out, no meaningful correlation was found for pedestal density changes in DIII-D. Therefore, as a final contribution in this thesis, we investigate how convective particle transport parallel to the magnetic field alters the density profiles. We compare the increase in convective parallel particle transport and find good agreement with experimental density profiles.
Author : Charles Edward Newman
Publisher :
ISBN 13 :
Total Pages : 172 pages
Book Rating : 4.F/5 ( download)
Download or read book Charged-particle Transport in Turbulent Astrophysical Plasmas written by Charles Edward Newman and published by . This book was released on 1972 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Philippe Ghendrih
Publisher : World Scientific
ISBN 13 : 9814644846
Total Pages : 336 pages
Book Rating : 4.8/5 (146 download)
Download or read book Rotation And Momentum Transport In Magnetized Plasmas written by Philippe Ghendrih and published by World Scientific. This book was released on 2014-12-30 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book compiles the contributions from various international experts on magnetized plasma physics, both in controlled fusion and in astrophysics, and on atmospheric science. Most recent results are presented along with new ideas. The various facets of rotation and momentum transport in complex systems are discussed, including atmospheric-ocean turbulence, the constraints, and the concept of potential vorticity. The close interplay between flows and magnetohydrodynamics dynamo action, instabilities, turbulence and structure dynamics are the main focus of the book, in the context of astrophysics and magnetic fusion devices like Tokamak, and Reversed Field Pinch. Both physicists and advanced students interested in the field will find the topics as interesting as researchers from other fields who are looking to broaden their perspectives.
Author :
Publisher :
ISBN 13 :
Total Pages : 82 pages
Book Rating : 4.:/5 (227 download)
Download or read book Charged Particle Transport in Turbulent Astrophysical Plasmas written by and published by . This book was released on 1972 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of electromagnetic fluctuations, or plasma turbulence, on the motion of the individual particles in a plasma is investigated; two alternative methods are used to find a general equation governing the time-evolution of a distribution of charged particles subject to both an external force field and the random fields of the fluctuations. It is found that, for the high-temperature, low-density plasmas frequently encountered in the study of astrophysics, the presence of even a small amount of turbulence can have a very important effect on the behavior of the plasma. Two problems in which turbulence plays an important role are treated in detail. (Author).
Author : Matthew Randall Stoneking
Publisher :
ISBN 13 :
Total Pages : 354 pages
Book Rating : 4.:/5 (89 download)
Download or read book Fast Electron Generation and Transport in a Turbulent, Magnetized Plasma written by Matthew Randall Stoneking and published by . This book was released on 1994 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 88 pages
Book Rating : 4.:/5 (685 download)
Download or read book Fast Electron Generation and Transport in a Turbulent, Magnetized Plasma written by and published by . This book was released on 1994 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: The nature of fast electron generation and transport in the Madison Symmetric Torus (MST) reversed field pinch (RFP) is investigated using two electron energy analyzer (EEA) probes and a thermocouple calorimeter. The parallel velocity distribution of the fast electron population is well fit by a drifted Maxwellian distribution with temperature of about 100 eV and drift velocity of about 2 x 106 m/s. Cross-calibration of the EEA with the calorimeter provides a measurement of the fast electron perpendicular temperature of 30 eV, much lower than the parallel temperature, and is evidence that the kinetic dynamo mechanism (KDT) is not operative in MST. The fast electron current is found to match to the parallel current at the edge, and the fast electron density is about 4 x 1011 cm−3 independent of the ratio of the applied toroidal electric field to the critical electric field for runaways. First time measurements of magnetic fluctuation induced particle transport are reported. By correlating electron current fluctuations with radial magnetic fluctuations the transported flux of electrons is found to be negligible outside r/a(approximately)0.9, but rises the level of the expected total particle losses inside r/a(approximately)0.85. A comparison of the measured diffusion coefficient is made with the ausilinear stochastic diffusion coefficient. Evidence exists that the reduction of the transport is due to the presence of a radial ambipolar electric field of magnitude 500 V/m, that acts to equilibrate the ion and electron transport rates. The convective energy transport associated with the measured particle transport is large enough to account for the observed magnetic fluctuation induced energy transport in MST.
Author : Francis James Casson
Publisher :
ISBN 13 :
Total Pages : 294 pages
Book Rating : 4.:/5 (921 download)
Download or read book Turbulent Transport in Rotating Tokamak Plasmas written by Francis James Casson and published by . This book was released on 2011 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Per Helander
Publisher : Cambridge University Press
ISBN 13 : 9780521020985
Total Pages : 316 pages
Book Rating : 4.0/5 (29 download)
Download or read book Collisional Transport in Magnetized Plasmas written by Per Helander and published by Cambridge University Press. This book was released on 2005-10-06 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: A graduate level text treating transport theory, an essential element of theoretical plasma physics.
Author : Vitalii D. Shafranov
Publisher : Springer Science & Business Media
ISBN 13 : 3540745769
Total Pages : 214 pages
Book Rating : 4.5/5 (47 download)
Download or read book Reviews of Plasma Physics written by Vitalii D. Shafranov and published by Springer Science & Business Media. This book was released on 2008-07-24 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents two reviews from the cutting-edge of Russian plasma physics research. The first review is devoted to the mechanisms of transverse conductivity and generation of self-consistent electric fields in strongly ionized magnetized plasma. The second review considers numerous aspects of turbulent transport in plasma and fluids. This second review is focused on scaling arguments for describing anomalous diffusion in the presence of complex structures.
