Reynolds stress of localized toroidal modes

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Abstract
An investigation of the two‐dimensional (2‐D) toroidal eigenmode problem reveals the possibility of a new consistent 2‐D structure, the dissipative ballooning mode of the second kind (BM‐II). In contrast to the conventional ballooning mode, the new mode is poloidally localized at π/2 (or−π/2), and possesses significant radial asymmetry. The radial asymmetry, in turn, allows the dissipative BM‐II to generate considerably larger Reynolds stress as compared to the standard slab drift‐type modes. It is also shown that a wide class of localized dissipative toroidal modes are likely to be of the dissipative BM‐II nature, suggesting that at the tokamak edge, the fluctuation generated Reynolds stress (a possible source of poloidal flow) can be significant.

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