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- W2801472213 abstract "Small 3D perturbations to the magnetic field in DIII-D (δB/B∼2×10−4) result in large modulations of density fluctuation amplitudes in the pedestal, which are shown using Doppler backscattering measurements to vary by a factor of 2. Helical perturbations of equilibrium density within flux surfaces have previously been observed in the pedestal of DIII-D plasmas when 3D fields are applied and were correlated with density fluctuation asymmetries in the pedestal. These intra-surface density and pressure variations are shown through two fluid MHD modeling studies using the M3D-C1 code to be due to the misalignment of the density and temperature equilibrium iso-surfaces in the pedestal region. This modeling demonstrates that the phase shift between the two iso-surfaces corresponds to the diamagnetic direction of the two species, with the mass density surfaces shifted in the ion diamagnetic direction relative to the temperature and magnetic flux iso-surfaces. The resulting pedestal density, potential, and turbulence asymmetries within flux surfaces near the separatrix may be at least partially responsible for several poorly understood phenomena that occur with the application of 3D fields in tokamaks, including density pump out and the increase in power required to transition from L- to H-mode." @default.
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- W2801472213 date "2018-04-19" @default.
- W2801472213 modified "2023-10-16" @default.
- W2801472213 title "Helical variation of density profiles and fluctuations in the tokamak pedestal with applied 3D fields and implications for confinement" @default.
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- W2801472213 doi "https://doi.org/10.1063/1.5024378" @default.
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