Momentum Transport Studies in High E x B Shear Plasmas in NSTX
Authors: W.M. Solomon, S.M. Kaye, R.E. Bell, B.P.LeBlanc, J.E. Menard, G. Rewoldt, W. Wang, F.M. Levinton and H. Yuh and S.A. Sabbagh
Abstract:
Experiments have been conducted on NSTX to study both steady state and perturbative mo mentum transport. These studies are unique in their parameter space under investigation, where the low aspect ratio of NSTX results in rapid plasma rotation with E x B shearing rates high enough to suppress low-k turbulence. In some cases, the ratio of momentum to energy confinement time is found to exceed five. Momentum pinch velocities of order 10-40 m/s are inferred from the measured angular momentum flux evolution after non-resonant magnetic perturbations are applied to brake the plasma.
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Submitted to: Physical Review Letters Manuscript No. LN11620
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Download PPPL-4327 (pdf 481KB 10pp)
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