Waveguide Coupling During Lower Hybrid Current Drive in a Tokamak |
Common terms and phrases
amplitude analysis arbitrary arg R₂ arg Rk degree assumed authors average beat signal calculation changes coefficients and phases considerably corresponding curve decrease density drop density gradient discussed equal EXPERIMENT experimental results explained field forward and reflected four four-waveguide front functions global grill grill mouth individual influence inner two waveguides inner waveguides input JIPP T-IIU k-th waveguide low power LHCD magnetic field matching MICHIGAN monitor N₂ normalized noted numerical calculation nwgd nwgd/nco obtained optimum coupling outer waveguides plasma plotted as functions position power reflection coefficients ramp density model reference reflected RF reflected signals represented respect RF coupling RF power satisfy scrape-off layer second waveguide shown in Fig step plus ramp switch taking into account theoretical theoretical calculation theory third waveguide tokamak triggered typical UNIVERSITY variation waveguide array waveguide mouth waves