Present and future of polarized neutron physics at PSI

The polarized neutron beam at PSI (formerly SIN) is presented. The neutrons are produced by quasi‐elastic and inelastic processes 12C (p↘,n↘)X with 590 MeV longitudinally polarized protons. A neutron polarization of 30 to 45% between 300 and 580 MeV can be achieved with 85% polarized protons. The experimental program involvingth the measurement of n‐p elastic spin dependent observables is presented as well as the future NA1 beam line.