Magnetic field stabilization for magnetically shielded volumes by external field coils
Magnetic field stabilization for magnetically shielded volumes by external field coils
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DOI：
10.1016/j.nima.2005.08.040
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发表时间：
2005-12-01
影响因子：
1.4
通讯作者：
Neri, B
中科院分区：
文献类型：
--
作者：
Brys, T;Czekaj, S;Neri, B
提出了用于提高四层铁磁屏蔽性能的主动稳定系统的新结果。该系统基于通过磁通门传感器测量屏蔽外部（但靠近）的磁场。该传感器的输出用于通过屏蔽周围的外部线圈系统馈送电流，从而将周围外部场在一个方向上稳定在预定值。在此，我们报告 PSI 磁性测试设施中系统的构造和表征，特别强调未来在中子电偶极矩 (nEDM) 测量中的潜在应用。由于 nEDM 实验中的积分时间较长（大约 100 秒或更长），只需校正缓慢的干扰。稳定后，对于固定的局部源以及在 10 m 距离的道路上行驶的车辆，观察到抑制因子约为 200。对于 100-1000 秒的积分时间，环境磁噪声降低了 10-20 倍。 (c) 2005 Elsevier B.V. 保留所有权利。
New results on an active stabilization system for improving the performance of a four-layer Ferromagnetic shield are presented. The system is based on measuring the magnetic field outside (but Close to) the shield by a fluxgate sensor. The output of this sensor is used to feed a Current through an external coil system surrounding the shield, thus stabilizing the ambient external field in one direction at a predefined value. Here we report on the construction and the characterization of the system in the magnetic test facility at PSI with special emphasis on a potential future application in a measurement of the neutron electric dipole moment (nEDM). Because of the long integration times in the nEDM experiment (about 100s or more) only slow disturbances have to be corrected for. With stabilization, suppression factors around 200 have been observed for stationary, localized sources and for vehicles moving on a road at 10 m distance. The ambient magnetic noise is reduced by a factor 10-20 for integration times of 100-1000s. (c) 2005 Elsevier B.V. All rights reserved.