It is shown that ion thermal conductivity close to the magnetic axis in tokamaks is reduced by a factor of |S|5/3 if (Mi/Me)2/3(Te/Ti)4/3/|S|5/3≫1. Here, S is the orbit squeezing factor, Mi(Me) is the ion (electron) mass, and Ti(Te) is the ion (electron) temperature. The reduction reflects both the increase of the fraction of trapped particles by a factor of |S|1/3, and the decrease of the orbit size in units of the poloidal flux ψ by a factor of |S|2/3.
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Shaing et al. (1997) studied this question.
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