A comparison of experimental measurements and theoretical studies of the quasicoherent (QC) mode, observed at high densities during enhanced D_α (EDA) H mode in the Alcator C-Mod tokamak, are reported. The QC mode is a high frequency (~100 kHz) nearly sinusoidal fluctuation in density and magnetic field, localized in the steep density gradient (``pedestal'') at the plasma edge, with typical wave numbers kR≈3--6 cm^-1, k_θ≈1.3 cm^-1 (midplane). It is proposed here that the QC mode is a form of resistive ballooning mode known as the resistive X-point mode, in reasonable agreement with predictions by the BOUT (boundary-plasma turbulence) code.
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Mazurenko et al. (2002) studied this question.
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