Realization of a magnetically shielded environment for a new measurement of the electric dipole moment of the neutron at the FRM-II and investigations of magnetic field related systematic effects

在10- 28e （cm）水平上测量中子电偶极矩极限的新一代实验需要前所未有的水平的磁屏蔽。由于其磁矩，中子受到地球磁场以及其他环境磁场波动和梯度的影响。在这个建议中，实现了一个最先进的高磁屏蔽环境，用于中子的精密实验，重点是nEDM的测量。为了建立这样的环境，需要对制造过程进行详细的设计和精确的控制。在屏蔽层内部，需要高精度地产生磁场，这就需要实施各种磁强计的手段。这是伴随着实验和理论研究磁场相关的系统影响的测量nEDM。

A new generation experiment to measure a limit for the electric dipole moment of the neutron (nEDM) on the 10-28 e(cm level requires magnetic shielding on an unprecedented level. Due to its magnetic moment, the neutron is affected by the earth magnetic field as well as by other ambient magnetic field fluctuations and gradients. in this proposal the realization of a state-of-the art magnetically highly shielded environment for precision experiments with neutrons with focus on the nEDM measurement is presented. To establish such an environment, a detailed design and accurate control of fabrication procedures is required. inside the shield, magnetic fields need to be generated with high precision, requiring the implementation of various means of magnetometry. This is accompanied by experimental and theoretical studies of magnetic field related systematic effects on the measurement of the nEDM.