Microwave reflectometry is a technique used to diagnose fusion plasmas to obtain information on the electronic density such as the density radial profile or information on coherent plasma events like magneto-hydrodynamic activities or/and relaxation and turbulent phenomena. To improve the understanding of the diagnostic, simulations of full reflectometer systems are needed including: (i) wave propagation; (ii) proper antenna setup and signal injection technique; (iii) signal detection and signal processing techniques and (iv) real size of the system. Simulation of wide band frequency modulated reflectometry (Frequency Modulated Continuous Wave — FMCW) where the frequency is continuously swept adds further requirements since a good behavior throughout the wide frequency band is required, including: numeric scheme used, absorbing boundary conditions, and signal injection (source). Signal injection poses particular challenges in our case where a monostatic setup is used (one single antenna used both for emission and reception) with the signal continously injected on the system while being simultaneously received. |
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