A Large Beta, MHD Stability, Neutral Beam Heating Steady-state Tokamak PDF Download
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Category : Magnetohydrodynamics
Languages : en
Pages : 60
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Author:
Publisher:
ISBN:
Category : Magnetohydrodynamics
Languages : en
Pages : 60
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Book Description
Author:
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Category :
Languages : en
Pages :
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Stable high-beta plasmas are required for the tokamak to attain an economical fusion reactor. Recently, intense neutral beam heating experiments in tokamaks have shown new effects on plasma stability and confinement associated with high beta plasmas. The observed spectrum of MHD fluctuations at high beta is clearly dominated by the n = 1 mode when the q = 1 surface is in the plasma. The m/n = 1/1 mode drives other n = 1 modes through toroidal coupling and n> 1 modes through nonlinear coupling. On PDX, with near perpendicular injection, a resonant interaction between the n = 1 internal kink and the trapped fast ions results in loss of beam particles and heating power. Key parameters in the theory are the value of q0 and the injection angle. High frequency broadband magnetic fluctuations have been observed on ISX-B and D-III and a correlation with the deterioration of plasma confinement was reported. During enhanced confinement (H-mode) discharges in divertor plasmas, two new edge instabilities were observed, both localized radially near the separatrix. By assembling results from the different tokamak experiments, it is found that the simple theoretical ideal MHD beta limit has not been exceeded. Whether this represents an ultimate tokamak limit or if beta optimized configurations (Dee- or bean-shaped plasmas) can exceed this limit and perhaps enter a second regime of stability remains to be clarified.
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Category : Aeronautics
Languages : en
Pages : 1572
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Category : Nuclear fusion
Languages : en
Pages : 162
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Category : Controlled fusion
Languages : en
Pages : 100
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Category : Power resources
Languages : en
Pages : 782
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Author:
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ISBN:
Category : Nuclear energy
Languages : en
Pages : 764
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Author: United States. Energy Research and Development Administration
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ISBN:
Category : Power resources
Languages : en
Pages : 936
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Category :
Languages : en
Pages : 724
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Author: United States. Energy Research and Development Administration. Technical Information Center
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Category : Force and energy
Languages : en
Pages : 1680
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