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A combined Doppler backscattering/cross-polarization scattering (DBS/CPS)system is being deployed on MAST-U, for simultaneous measurements of localdensity turbulence, turbulence flows, and magnetic turbulence. In this design,CPS shares the probing beam with the DBS and uses a separate parallel-viewingreceiver system. In this study, we utilize a modified GENRAY 3D ray-tracingcode, to simulate the propagation of the probing and scattered beams. Thecontributions of different scattering locations along the entire beamtrajectories are considered, and the corresponding local $\tilde{\mathbf{B}}$wavenumbers are estimated using the wave-vector matching criterion. Thewavenumber ranges of the local $\tilde{\mathbf{B}}$ that is detectable to theCPS system are explored for simulated L- and H-mode plasmas.

Ray-tracing Analysis for Cross-polarization Scattering Diagnostic on MAST-Upgrade Spherical Tokamak