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