Frequency of 2nd harmonic X-mode ECE radiation as a function of major radius. The two bold-black dashed lines mark the frequencies of 75 and 110 GHz, respectively, and the vertical arrow at the horizontal axis marks the magnetic axis. The shaded area in the figure marks the overlap with the third harmonic ECE.
(a) 3D viewing of LO optics and (b) Gaussian beam trace of the LO optics at 75 GHz.
Gaussian beam traces of the RF optics at (a) wide zoom and (b) narrow zoom. They are simulated at 75 GHz where the diffraction effects are the largest. The image surfaces are set at R = 1.98 m.
Schematic representation of the electronics of a single mixer/detector for a typical ECEI system.
Gaussian beams of the LO optics when scanning along the H plane and E plane directions.
(a) The scanning of the focal plane by translating the position of the E1 lens and moving the scattering rod in the vertical direction. The color denotes the voltage coming from the video amplifiers. (b) The size of the beam waist.
Calibrations of RF optics under narrow zoom and wide zoom conditions. The solid line represents the simulation results and the shaded area represents the test results.
Comparison of Gaussian spot size at different LO frequencies.
Effect of the translation of each lens on the spot size at the detector array with fLO = 75 GHz.
Radial and vertical resolution at narrow and wide zoom case when Bt = 1.33 T/2.0 T.
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