Open AccessOperational limits in the National Spherical Torus Experiment
Author(s) -
S. Kaye,
M.G. Bell,
R. E. Bell,
D. Gates,
R. Maingi,
E. Mazzucato,
J. Ménard,
D. Mueller,
W. Park,
S. F. Paul,
S.A. Sabbagh,
D. Stutman
Publication year - 2000
Language(s) - English
Resource type - Reports
DOI - 10.2172/757304
Subject(s) - torus , physics , plasma , limit (mathematics) , ohmic contact , instability , atomic physics , tearing , mechanics , computational physics , nuclear physics , quantum mechanics , electrode , geometry , thermodynamics , mathematics , mathematical analysis
The National Spherical Torus Experiment (NSTX) is a proof-of-principle scale device whose mission is to establish the physics basis of low aspect configurations most notably in the areas of plasma stability, transport and non-inductive current drive. The first series of physics experiments was conducted during the period from Sept. 1999 through Jan. 2000. Among the first experiments was a study to map out and characterize the operational density and q-limits. Density limits have typically been associated with enhanced radiated power due to overfuelling or impurity influx, although ion neoclassical transport may impose a density limit at very high densities in ohmic, gas-fueled plasmas. q-limits have typically been manifestations of destabilization of m=2/n=1 kink or tearing modes that lead to a sudden discharge termination
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