Neutron polarizer for PERC

PERC和其他研究中子β衰变相关性的项目目前由于了解平均中子束极化，精度仅限于10-3级。单超反射镜偏振器样品的先前测试可以证明在确定绝对偏振的几倍10-4的精度水平的可行性。基于所获得的结果，将在该项目中开发新的铁磁超镜结构，这将需要比实际上任何可比结构小得多的磁保持场。这样，直接在偏振器内部的去偏振损耗的可能减少最终将使偏振的最终精度达到10-4。本项目的最终目标是设计和生产一个真实的尺寸偏振器的PERC设备，包括所有所需的规格。

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.