In magnetic confinement fusion, the zonal direction primarily connotes the poloidal direction (i.e. the short way around the torus), the corresponding coordinate being denoted by y in the slab approximation or θ in magnetic coordinates.
In magnetic confinement fusion, the zonal direction primarily connotes the poloidal direction (i.e. the short way around the torus), the corresponding coordinate being denoted by y in the slab approximation or θ in magnetic coordinates.
Source: Wikipedia "Zonal and poloidal" · CC BY-SA 4.0
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