A set of reduced equations is derived for use in simulations of electromagnetic turbulence in tokamaks, in which the electron transit time scale is removed. The time step is not subject to a Courant condition depending on the electron thermal speed, but instead depends on the Alfvén speed. This allows significantly longer time steps in explicit numerical methods, for relevant values of the ratio of electron pressure to magnetic pressure.
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Hinton et al. (2002) studied this question.
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