PHIP sequences and dipolar fields I — single spin control

inhomogeneities. By combining tools from average Hamiltonian theory with detailed numerical simulations, we introduce and characterise a wide range of transfer sequences, including dipolar-field adjusted and dipolar-field suppressing protocols. We identify conditions under which dipolar interactions either hinder or, perhaps surprisingly, stabilise polarisation transfer, depending on the sequence structure. Our results offer practical guidance for the selection and design of PHIP transfer sequences under realistic experimental constraints and open pathways towards robust hyperpolarisation in concentrated liquid-state NMR samples.