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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Encouraging results with neutral beam heating and adiabatic compression of tokamak plasmas have prompted new experiments which will study the approach to high .beta. states. As projected tokamak .beta. values become nonnegligible (average .beta. of 4% is the goal), the models previously used for transport calculations will become inadequate. These models will be required to account for the evolution of the magnetic geometry, along with the change in plasma parameters. We present an axisymmetric transport model which should be useful for studying the approach to higher .beta. values in tokamak experiments. Results from transport calculations with this model allow us to draw a parallel between observed behavior in seemingly unrelated experiments: electron heating by neutral injection in the ORMAK device and adiabatic compression in the ATC experiment. Finally, we find that the nature of cross-field transport may be expected to change as significant .beta. values are reached. Enhanced transport from ballooning instabilities is likely to play a role as important as that now played by sawtooth (m = 1) and saturated (m = 2) instabilities. New techniques for describing this transport are required.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Encouraging results with neutral beam heating and adiabatic compression of tokamak plasmas have prompted new experiments which will study the approach to high .beta. states. As projected tokamak .beta. values become nonnegligible (average .beta. of 4% is the goal), the models previously used for transport calculations will become inadequate. These models will be required to account for the evolution of the magnetic geometry, along with the change in plasma parameters. We present an axisymmetric transport model which should be useful for studying the approach to higher .beta. values in tokamak experiments. Results from transport calculations with this model allow us to draw a parallel between observed behavior in seemingly unrelated experiments: electron heating by neutral injection in the ORMAK device and adiabatic compression in the ATC experiment. Finally, we find that the nature of cross-field transport may be expected to change as significant .beta. values are reached. Enhanced transport from ballooning instabilities is likely to play a role as important as that now played by sawtooth (m = 1) and saturated (m = 2) instabilities. New techniques for describing this transport are required.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Calculations are made to study the stability and accessibility of tokamak plasmas in the high energy density regime which is desirable for economical reactor operation. Results are given from flux conserving tokamak (FCT) models, classical models, and more complete models with spatially resolved (R, Z) transport, including effects from sawtooth oscillations and magnetic islands. MHD equilibrium, stability, and transport calculations are made to study the accessibility and behavior of high-beta tokamak plasmas in the range [beta] H"5-15%. For next-generation devices, beta values of, at least, 8% appear to be accessible and stable if there is a conducting surface nearby.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
MHD equilibrium, stability, and transport calculations are made to study the accessibility and behavior of ''high beta'' tokamak plasmas in the range .beta. approximately 5 to 15 percent. For next generation devices, beta values of at least 8 percent appear to be accessible and stable if there is a conducting surface nearby.
Author: Frederick B. Marcus Publisher: Springer Nature ISBN: 3031177118 Category : Science Languages : en Pages : 484
Book Description
This book offers an overall review, applying systems engineering and architecture approaches, of the design, optimization, operation and results of leading fusion experiments. These approaches provide a unified means of evaluating reactor design. Methodologies are developed for more coherent construction or evaluation of fusion devices, associated experiments and operating procedures. The main focus is on tokamaks, with almost all machines and their important results being integrated into a systems design space. Case studies focus on DIII-D, TCV, JET, WEST, the fusion reactor prototype ITER and the EU DEMO concept. Stellarator, Mirror and Laser inertial confinement experiments are similarly analysed, including reactor implications of breakeven at NIF. The book examines the engineering and physics design and optimization process for each machine, analysing their performance and major results achieved, thus establishing a basis for the improvement of future machines. The reader will gain a broad historical and up-to-date perspective of the status of nuclear fusion research from both an engineering and physics point of view. Explanations are given of the computational tools needed to design and operate successful experiments and reactor-relevant machines. This book is aimed at both graduate students and practitioners of nuclear fusion science and engineering, as well as those specializing in other fields demanding large and integrated experimental equipment. Systems engineers will obtain valuable insights into fusion applications. References are given to associated complex mathematical derivations, which are beyond the scope of this book. The general reader interested in nuclear fusion will find here an accessible summary of the current state of nuclear fusion.
Author: United States. Congress. House. Committee on Science, Space, and Technology. Subcommittee on Investigations and Oversight Publisher: ISBN: Category : Fusion reactors Languages : en Pages : 820
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Author: ![High Beta Tokamaks. [MHD Equilibrium, Stability, and Transport Calculations]. PDF](https://books.google.com/books/content/images/frontcover/RsVbAQAACAAJ?fife=w80-h100)
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Author: Frederick B. Marcus
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Author: United States. Department of Energy
Author: United States. Congress. House. Committee on Science, Space, and Technology. Subcommittee on Investigations and Oversight