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Gas-puff imaging techniques are employed to determine the far SOL regionradial electric field and the plasma potential in ICRF heated discharges in theAlcator C-Mod tokamak. The 2-dimensional velocity fields of the turbulentstructures, which are advected by RF-induced $ \mathbf{E\times B} $ flows, areobtained via the time-delay estimation (TDE) techniques. Both the magnitude andradial extension of the radial electric field $ E_r $ are observed to increasewith the toroidal magnetic field strength $ B_\varphi $ and the ICRF power. Inparticular, the RF-induced $ E_r $ extends from the vicinity of the ICRFantenna to the separatrix when $ B_\varphi=7.9\,\mathrm{T} $ and $P_{\mathrm{ICRF}} \gtrsim 1\,\mathrm{MW} $. In addition, low-Z impurity seedingnear the antenna is found to substantially reduce the sheath potentialassociated with ICRF power. The ICRF-induced potentials are also estimated indifferent antenna configurations: (1) conventional toroidally-aligned (TA)antenna versus field-aligned (FA) antenna; (2) FA monopole versus FA dipole.Results show that FA and TA antennas produce similar magnitude of plasmapotentials, and the FA monopole induced greater potential than the FA dipolephasing.

Characterization of SOL Plasma Flows and Potentials in Alcator C-Mod