Status of the RTP Pulsed-Radar Reflectometer and Prospects for ITER
At the Rijnhuizen Tokamak Experiment (RTP) in the Netherlands, a four-channel pulsed-radar reflectometer is developed and installed. Carrier frequencies of 29, 33, 36 and 39GHz are modulated with sub-nanosecond pulses and transmitted in the O-mode. This means that these pulses, once transmitted into the plasma, will reflect from a critical density layer where the plasma frequency equals the probing frequency. The time of flight of these pulses is detected with an accuracy of 70ps, corresponding to an accuracy of 1cm when reflections from a metal mirror in vacuum are detected.
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