Neutron polarizer for PERC

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PERC and other projects investigating correlations in neutron beta decay are presently limited in accuracy at the 10-3 level by the knowledge of the average neutron beam polarisation. Preceding tests of single supermirror polariser samples could proof the feasibility in the determination of the absolute polarisation to a level of accuracy of several times 10-4. Based on the obtained results, new ferromagnetic supermirror structures will be developed within this project, which will require in much smaller magnetic holding fields than actually any comparable structure. This way, a possible reduction of depolarization losses directly inside the polariser should finally make an ultimate accuracy in polarization of 10-4 reachable. The final goal of this project is the design and production of a real size polariser for the PERC apparatus including all desired specs.