We discuss how up-coming Sunyaev-Zel'dovich surveys can be used in various cosmological experiments In particular we consider how they can be used to constrain cosmological parameters and how, when combined with surveys of background polarized sources with instruments such as the SKA, the cosmological evolution of cluster magnetic fields can be determined. Our discussion includes as-pects of cluster selection, sample contamination, rotation measure grids and system requirements to match these goals. Our contribution compares the performances of different instruments and detection algorithms and discusses future challenges.
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