Abstract
New design criteria enable the improvement of the magnetic field shapes of the rf gradient neutron spin flipper. Numerical simulations of the performance of optimized devices reveal broadband efficiency of both the adiabatic spin inversion of all neutrons with λ > 2 Å using tangent-shaped field gradients as well as the nonadiabatic spinflip of thermal neutrons by the linear gradient rf flipper. Test experiments with thermal neutrons confirm the validity of the numerical simulations.
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