The analysis of discharges with strong on- and off-axis ion cyclotron resonance heating shows that the transport of heat in JET is local and diffusive. Discharges with or without pellet injection are considered; in all cases, the electron temperature profile responds to the location of the heating. The total heat flow Q can be described by a local diffusive model of the form Q = -χ(q ψ , |∇T e |) n e ∇T e , where χ is proportional to q ψ 1.75 and increases with |∇T e |. Several forms of the dependence of χ on |∇T e | are shown to give a reasonable fit to the data
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Balet et al. (1994) studied this question.
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