New transmission lines and antennas have been recently installed at JET under the EFDA enhancement project "Millimeter Wave Access (MWA)" to meet the performance requirements of broadband reflectometry for density profile measurements. Taking advantage of this new facility a profile reflectometer is being developed. The new design consists of a fast swept FMCW reflectometer using coherent detection of the reflected signal. This reflectometer uses a single VCO oscillator as the main swept source and employs a heterodyne receiver configuration. Here we describe the operating principles of the new system and its expected performance taking in consideration the performance of the new waveguides and antennas. It is presented also the design topology for this swept reflectometer that is capable of operating on bistatic antenna arrangements over long waveguides using a local generated reference which are operating conditions that are likely to be those of ITER reflectometers. |
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