It is shown that the collisional detrapping of magnetically trapped electrons in tokamaks can excite drift tearing modes with high azimuthal mode numbers. For normal temperature gradients (dlnTₑdlnn>0), the modes are unstable in the collisional regime (νeff>ω_*e), but stable in the collisionless regime (νeff<ω_*e).
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Chen et al. (1977) studied this question.
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