Electron cyclotron resonant heating with an ordinary-mode antenna in the JFT-2 tokamak

Radio-frequency power of up to 110 kW for 14 ms at 28 GHz is launched in a horizontal polarization from the outside midplane at an angle nearly perpendicular to the 10-kG toroidal field of the JFT-2 tokamak. With initial Ohmic power comparable to the RF power, the central electron temperature increases from 600 to 1000 eV in 10 ms. Details of the electron heating are reported.