Semiempirical models of H-mode discharges
The H-mode transition can lead to a rapid increase in tokamak plasma confinement. A semiempirical transport model was derived from global OH and L-mode confinement scalings and then applied to simulation of H-mode discharges. The radial diffusivities in the model also depend on local density and pressure gradients and satisfy an appropriate dimensional constraint. Examples are shown of the application of this and similar models to the detailed simulation of two discharges which exhibit an H-mode transition. The models reproduce essential features of plasma confinement in the ohmic heating, low and high confinement phases of these discharges. In particular, the evolution of plasma energy content through the H-mode transition can be reproduced without any sudden or ad hoc modification of the plasma transport formulation.
- Research Organization:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Max-Planck-Institut fuer Plasmaphysik, Garching (Germany, F.R.)
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 5598094
- Report Number(s):
- PPPL-2103; ON: DE85011581
- Country of Publication:
- United States
- Language:
- English
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