Observation of neoclassical-like impurity transport in the q less than or equal to 1 region of the PBX tokamak [electronic resource].
- Princeton, N.J. : Princeton University, 1986.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- Pages: 17 : digital, PDF file
- Additional Creators:
- Princeton University
United States. Department of Energy. Office of Scientific and Technical Information
- Charge-dependent convective impurity transport is observed in the central core of PBX H-mode discharges by measuring radial profiles for both low- and high-Z intrinsic impurities in the presence of strong sawtooth activity. Transport coefficients are derived by simulating the data with a diffusive/convective transport model which includes an internal disruption model. The time evolving Z/sub eff/ profile and central metallic densities are fitted during the quiescent phase between internal disruptions to yield a diffusion coefficient of D = 1 x 10/sup 3/ cm/sup 2//s for all species and an inward convective speed of v = 2.2 x 10/sup 2/ (r/a) cm/s for oxygen and carbon and v = 1.1 x 10/sup 3/ (r/a) cm/s for metals. These transport coefficients are in quantitative agreement with simple cylindrical neoclassical estimates for the region within q less than or equal to 1. 17 refs., 4 figs.
- Published through SciTech Connect.
Sesnic, S.; Ida, K.; LeBlanc, B.; Fonck, R.J.; Hulse, R.A.
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