The driving toroidal electric field in Tokamaks is shown to lead to a significant pinching effect at low collision frequency. For β_θ=8πpB_θ^_²<1, where B_θ is the poloidal field, this pinching is more rapid than outward diffusion in the banana and plateau regimes of toroidal transport theory.
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Rutherford et al. (1970) studied this question.
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