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A CLASS OF HIGH EBP EQUILIBRIA IN STRONGLY FINITE ASPECT RATIO TOKAMAK PLASMAS

By Y.R. LIN-LIU, A.D. TURNBULL, R.L. MILLER, V.S. CHAN and P.A. POLITZER

Abstract

OAK B202 A CLASS OF HIGH EBP EQUILIBRIA IN STRONGLY FINITE ASPECT RATIO TOKAMAK PLASMAS. A class of very high poloidal beta ({beta}{sub p}) equilibria is exhibited in which {var_epsilon}{beta}{sub p} ({var_epsilon} is the inverse aspect ratio) exceeds analytic equilibrium limits previously anticipated from simplified large aspect ratio models, as well as previous experimental equilibrium limits. The extension in these limits is shown to be due to a combination of finite aspect ratio effects and strong cross section shaping. In a conventional size configuration, equilibria with {var_epsilon}{beta}{sub p} = 3 exist, which is 50% higher than both the previously observed record and the analytically predicted limit. For very low aspect ratio with {var_epsilon}{sup -1} = 1.4, typical of spherical tori, values of {var_epsilon}{beta}{sub p} = 5 are possible

Topics: 70 Plasma Physics And Fusion Technology, Cross Sections, Limiting Values, Equilibrium, Tokamak Devices, High-Beta Plasma, Aspect Ratio
Publisher: General Atomic Company
Year: 2002
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Provided by: UNT Digital Library
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