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A quasicoherent feature localized near the magnetic flux surface having a safety factor q=3 has been detected by Langmuir probe and heavy ion beam probe (HIBP) measurements in the edge plasma of the Texas Experimental Tokamak (TEXT) [Nucl. Technol. Fusion 1, 479 (1981)]. A mode is identified with relatively low poloidal wave number (m=12) compared to the usual broadband turbulence with m in the range of 50 to 100. In contrast to the turbulent activity, this mode is collisional and does not produce a fluctuation-driven radial particle flux via the coupling between density and potential fluctuation. A comparison with the expectation of the drift-tearing activity indicates that the mode can be collisional drift-tearing unstable.
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Tsui et al. (1993) studied this question.
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