Transport properties of interacting magnetic islands in tokamak plasmas
This paper explores the equilibrium and transient transport properties of a mixed magnetic topology model for tokamak equilibria. The magnetic topology is composed of a discrete set of mostly non-overlapping magnetic islands centered on the low-order rational surfaces. Transport across the island regions is fast due to parallel transport along the stochastic magnetic field lines about the separatrix of each island. Transport between island regions is assumed to be slow due to a low residual cross-field transport. In equilibrium, such a model leads to: a nonlinear dependence of the heat flux on the pressure gradient; a power balance diffusion coefficient which increases from core to edge; and profile resiliency. Transiently, such a model also exhibits a heat pulse diffusion coefficient larger than the power balance diffusion coefficient.
- Research Organization:
- Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-86ER53218
- OSTI ID:
- 10137725
- Report Number(s):
- UW-CPTC-93-7; ON: DE94009208; BR: AT0500000/AT0520210; TRN: 94:006650
- Resource Relation:
- Other Information: PBD: Oct 1993
- Country of Publication:
- United States
- Language:
- English
Similar Records
Magnetic island effects, interactions in tokamaks
Interaction of bootstrap-current-driven magnetic islands