The Scaling of Electron and Ion Transport in the High-power Spherical Torus NSTX
Authors: S.M. Kaye, R.E. Bell, D. Gates, B.P. LeBlanc, F.M. Levinton, J.E. Menard, D. Mueller, G. Rewoldt, S.A. Sabbagh, W. Wang, and H. Yuh
Abstract:
Dedicated H-mode parameter scans in the high power National Spherical Torus Experiment (NSTX) have been used to establish the confinement scaling and underlying transport trends at low aspect ratio (R/a~1.3). These scans indicate a strong dependence of the global and thermal energy confinement times on the toroidal field, Β0.9 T, while their dependence on plasma current is weaker, I 0.4 p. Local transport analysis indicates that the electrons control the ΒT scaling, whereas the ions control the Ip scaling, with Χi outside r/a=0.5 at the neoclassical level.
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Published in: Phys. Rev. Lett. 98, 175002 (2007)
doi: 10.1103/PhysRevLett.98.175002
Copyright (2007) American Institute of Physics.
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