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Measurements Of Reduced Neoclassical Particle And Electron Heat Transport With Quasisymmetry In The Hsx Stellarator
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Book Synopsis Measurements of Reduced Neoclassical Particle and Electron Heat Transport with Quasisymmetry in the HSX Stellarator by : John M. Canik
Download or read book Measurements of Reduced Neoclassical Particle and Electron Heat Transport with Quasisymmetry in the HSX Stellarator written by John M. Canik and published by . This book was released on 2007 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurements and Modeling of Turbulent Transport in the HSX Stellarator by : Walter Allen Guttenfelder
Download or read book Measurements and Modeling of Turbulent Transport in the HSX Stellarator written by Walter Allen Guttenfelder and published by . This book was released on 2008 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Heat Transport Experiments on the HSX Stellarator by :
Download or read book Heat Transport Experiments on the HSX Stellarator written by and published by . This book was released on 2014 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: It has been observed in tokamaks that temperature profiles are resilient to changes in heating, and that this effect has not been observed in conventional stellarators. Electron temperature profile resiliency is attributed to anomalous transport driven by turbulent micro-instabilities, and the resulting stiffness in the electron heat flux is measured using a combination of steady-state and perturbative experiments. In this work, stiffness measurements are presented in the quasihelically symmetric configuration of the Helically Symmetric eXperiment (HSX), in which the neoclassical transport is comparable to a tokamak and turbulent transport dominates throughout the plasma. A second gyrotron and transmission line have been installed and tested to facilitate modulated heating experiments on HSX, and a multi-pass absorption model accurately predicts the total absorption and spatial extent of the electron cyclotron resonance heating during a modulation experiment. The electron cyclotron emission measured by an absolutely calibrated 16-channel radiometer is used to measure the local electron temperature and its response to the modulated heating. The amplitude and phase of the heat wave through the foot of the steep electron temperature gradient region of the plasma, 0.2
Book Synopsis Geometry Dependence of TEM Turbulence in the HSX Stellarator and Comparison to Nonlinear Gyrokinetic Simulation by : Jason Cedric Smoniewski
Download or read book Geometry Dependence of TEM Turbulence in the HSX Stellarator and Comparison to Nonlinear Gyrokinetic Simulation written by Jason Cedric Smoniewski and published by . This book was released on 2021 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulent transport is responsible for much of the energy and particle losses in present-day fusion plasma experiments, and optimization to reduce turbulence will be a major step towards realizing the benefits of fusion energy. Stellarators, with the flexibility afforded by external coils and three-dimensional geometry, may be able to reduce turbulence through careful shaping of the magnetic field. Such optimization relies on the ability of simulations to accurately predict turbulence in real devices, and validation studies are severely lacking for the stellarator. In this dissertation, the magnetic flexibility of the Helically Symmetric eXperiment (HSX) stellarator is exploited to investigate Trapped Electron Mode (TEM) turbulence in quasi-helically symmetric and degraded-symmetry configurations through experimental measurements and gyrokinetic simulation. This work includes the first comparison of nonlinear simulations in the Quasi-Helically Symmetric (QHS) and Mirror configurations, as well as the first comparison of nonlinear simulations at experimental parameters to experimental measurements. A database of archived HSX plasma discharges has enabled the temperature and density profiles to be matched in QHS and Mirror, showing that thermal transport is larger in the Mirror configuration at the mid-radius. Simulations do not reproduce this difference between geometries, but transport is sensitive to whether turbulence is in a ∇[n]-driven or ∇[T][e]-driven regime. More precise gradient measurements would be required for full validation of this geometry dependence. While linear growth rates are not predictive of overall turbulence, general aspects of experimental transport are captured by nonlinear simulations. In both simulation and experiment, the heat flux and density fluctuation amplitude increase more strongly with the density gradient than the temperature gradient, and the simulated heat flux matches measurements within experimental uncertainties for both configurations. This confirms that ∇[n]-driven TEM turbulence is the dominant driver of anomalous transport in HSX. Zonal flows can be important to TEM turbulence saturation, and are present in all nonlinear simulations of HSX. This work includes the first calculation of the linear collisionless zonal flow damping in quasi-symmetric magnetic geometry. Flux-tube, flux-surface, and full-volume calculations of the zonal flow evolution and residual are compared in the QHS and Mirror configurations, as well as the quasi-axial symmetry of the National Compact Stellarator eXperiment (NCSX). Despite quasi-symmetry, the dynamics of the zonal flow in all three configurations are similar to those in a conventional stellarator. The zonal flow oscillation presents another opportunity for comparison between simulation and experiment, but measurement of the zonal flow is left to future work. This dissertation is only the starting point for a validation study on the HSX stellarator. Significant opportunities exist for updated experimental measurements and a deeper investigation into the nonlinear physics responsible for TEM dynamics.
Download or read book Fusion Science and Technology written by and published by . This book was released on 2006 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ideal MHD written by Jeffrey P. Freidberg and published by Cambridge University Press. This book was released on 2014-06-26 with total page 743 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive, self-contained, and clearly written, this book describes the macroscopic equilibrium and stability of high temperature plasmas.
Book Synopsis Algorithms for Minimization Without Derivatives by : Richard P. Brent
Download or read book Algorithms for Minimization Without Derivatives written by Richard P. Brent and published by Courier Corporation. This book was released on 2013-06-10 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: DIVOutstanding text for graduate students and research workers proposes improvements to existing algorithms, extends their related mathematical theories, and offers details on new algorithms for approximating local and global minima. /div
Book Synopsis Ideal Magnetohydrodynamics by : Jeffrey P. Freidberg
Download or read book Ideal Magnetohydrodynamics written by Jeffrey P. Freidberg and published by Springer. This book was released on 2013-11-20 with total page 489 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theory of Fusion Plasmas by : Olivier Sauter
Download or read book Theory of Fusion Plasmas written by Olivier Sauter and published by American Institute of Physics. This book was released on 2008-12-02 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Joint Varenna-Lausanne International Workshop on Theory of Fusion Plasmas takes place every other year in a place particularly favorable for informal and in depth discussions. Invited and contributed papers present state-of-the art researches in theoretical plasma physics, covering all domains relevant to fusion plasmas. This workshop always allows a fruitful mix of experienced researchers and students, to allow for a better understanding of the key theoretical physics models and applications, such as: Theoretical issues related to burning plasmas; Anomalous Transport (Turbulence, Coherent Structures, Microinstabilities) RF Heating and Current Drive; Macroinstabilities; Plasma-Edge Physics and Divertors; Fast particles instabilities.
Author :National Academies of Sciences, Engineering, and Medicine Publisher :National Academies Press ISBN 13 :0309484529 Total Pages :511 pages Book Rating :4.3/5 (94 download)
Book Synopsis Negative Emissions Technologies and Reliable Sequestration by : National Academies of Sciences, Engineering, and Medicine
Download or read book Negative Emissions Technologies and Reliable Sequestration written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2019-04-08 with total page 511 pages. Available in PDF, EPUB and Kindle. Book excerpt: To achieve goals for climate and economic growth, "negative emissions technologies" (NETs) that remove and sequester carbon dioxide from the air will need to play a significant role in mitigating climate change. Unlike carbon capture and storage technologies that remove carbon dioxide emissions directly from large point sources such as coal power plants, NETs remove carbon dioxide directly from the atmosphere or enhance natural carbon sinks. Storing the carbon dioxide from NETs has the same impact on the atmosphere and climate as simultaneously preventing an equal amount of carbon dioxide from being emitted. Recent analyses found that deploying NETs may be less expensive and less disruptive than reducing some emissions, such as a substantial portion of agricultural and land-use emissions and some transportation emissions. In 2015, the National Academies published Climate Intervention: Carbon Dioxide Removal and Reliable Sequestration, which described and initially assessed NETs and sequestration technologies. This report acknowledged the relative paucity of research on NETs and recommended development of a research agenda that covers all aspects of NETs from fundamental science to full-scale deployment. To address this need, Negative Emissions Technologies and Reliable Sequestration: A Research Agenda assesses the benefits, risks, and "sustainable scale potential" for NETs and sequestration. This report also defines the essential components of a research and development program, including its estimated costs and potential impact.
Download or read book Complex Plasmas written by Michael Bonitz and published by Springer Science & Business Media. This book was released on 2014-04-09 with total page 495 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides the reader with an introduction to the physics of complex plasmas, a discussion of the specific scientific and technical challenges they present and an overview of their potential technological applications. Complex plasmas differ from conventional high-temperature plasmas in several ways: they may contain additional species, including nano meter- to micrometer-sized particles, negative ions, molecules and radicals and they may exhibit strong correlations or quantum effects. This book introduces the classical and quantum mechanical approaches used to describe and simulate complex plasmas. It also covers some key experimental techniques used in the analysis of these plasmas, including calorimetric probe methods, IR absorption techniques and X-ray absorption spectroscopy. The final part of the book reviews the emerging applications of microcavity and microchannel plasmas, the synthesis and assembly of nanomaterials through plasma electrochemistry, the large-scale generation of ozone using microplasmas and novel applications of atmospheric-pressure non-thermal plasmas in dentistry. Going beyond the scope of traditional plasma texts, the presentation is very well suited for senior undergraduate, graduate students and postdoctoral researchers specializing in plasma physics.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2004 with total page 788 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Plasma Physics and Fusion Energy by : Jeffrey P. Freidberg
Download or read book Plasma Physics and Fusion Energy written by Jeffrey P. Freidberg and published by Cambridge University Press. This book was released on 2008-07-10 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: There has been an increase in interest worldwide in fusion research over the last decade and a half due to the recognition that a large number of new, environmentally attractive, sustainable energy sources will be needed to meet ever increasing demand for electrical energy. Based on a series of course notes from graduate courses in plasma physics and fusion energy at MIT, the text begins with an overview of world energy needs, current methods of energy generation, and the potential role that fusion may play in the future. It covers energy issues such as the production of fusion power, power balance, the design of a simple fusion reactor and the basic plasma physics issues faced by the developers of fusion power. This book is suitable for graduate students and researchers working in applied physics and nuclear engineering. A large number of problems accumulated over two decades of teaching are included to aid understanding.
Download or read book Fusion written by Garry McCracken and published by Academic Press. This book was released on 2013 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Offers scientists and researchers the scientific basics, up-to-date current research, technical developments, and practical applications needed in fusion energy research/"--pub. desc.
Download or read book Fusion Technology written by and published by . This book was released on 1998 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fusion written by Robin Herman and published by Cambridge University Press. This book was released on 2006-03-16 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the story of the international race to build the first atomic fusion reactor.
Download or read book Fusion written by Joan Lisa Bromberg and published by MIT Press. This book was released on 1982 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: For more than thirty years, the prospect of unlimited fusion energy has attracted scientists and the public. Joan Lisa Bromberg's book documents the history of the American magnetic fusion reactor program. It is also a lively account that will inform interested citizens of limited technical background who are concerned with the nation's energy strategy. The book carries the story from the program's inception under the auspices of the Atomic Energy Commission in 1951 to its operations under the then-new Department of Energy in 1978. Fusion concentrates on the four federally funded laboratories where most of the money has been spent (about $2 billion so far): Oak Ridge, Los Alamos, Lawrence Livermore, and Princeton. It recounts the crucial experiments along the way - the ones that succeeded, the ones that failed, the ones that showed promise. And it explains and diagrams the various magnetic configurations and devices that were developed and tested: the stellarator, the pinch, the mirror, the tokamak. With the government and the public constantly looking over the scientists' shoulders, it is no surprise that research directions were heavily influenced by extrascientific pressures: the major decisions in fusion research have always emerged from a medley of technical, institutional, and political considerations. The intermingling of science and politics is demonstrated in specific detail. The magnetic fusion reactor project is, of course, ongoing. Latest target date for producing commercial power: 2050. Estimated total cost: $15 billion. Dr. Bromberg has written extensively on topics in the history of modern science.
