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Aspect Ratio Scaling of Ideal No-wall Stability Limits in High Bootstrap Fraction Tokamak Plasmas [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Science, 2003.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
1.2 MB pages : digital, PDF file
Additional Creators
United States. Department of Energy. Office of Science and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Recent experiments in the low aspect ratio National Spherical Torus Experiment (NSTX) [M. Ono et al., Nucl. Fusion 40 (2000) 557] have achieved normalized beta values twice the conventional tokamak limit at low internal inductance and with significant bootstrap current. These experimental results have motivated a computational re-examination of the plasma aspect ratio dependence of ideal no-wall magnetohydrodynamic stability limits. These calculations find that the profile-optimized no-wall stability limit in high bootstrap fraction regimes is well described by a nearly aspect ratio invariant normalized beta parameter utilizing the total magnetic field energy density inside the plasma. However, the scaling of normalized beta with internal inductance is found to be strongly aspect ratio dependent at sufficiently low aspect ratio. These calculations and detailed stability analyses of experimental equilibria indicate that the nonrotating plasma no-wall stability limit has been exceeded by as much as 30% in NSTX in a high bootstrap fraction regime.
Report Numbers
E 1.99:pppl-3908
pppl-3908
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
11/25/2003.
"pppl-3908"
R.E. Bell; S.M. Kaye; M.G. Bell; D.A. Gates; B.P. LeBlanc; J.E. Menard; S.A. Sabbagh; R. Maingi; V. Soukhanovskii; D. Stutman; the NSTX National Research Team.
Princeton Plasma Physics Lab., NJ (US)
Type of Report and Period Covered Note
Topical;
Funding Information
AC02-76CH03073
View MARC record | catkey: 14741612