Magnetic shielding of the cold atom space clock PHARAO
Magnetic shielding of the cold atom space clock PHARAO
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DOI：
10.1016/j.actaastro.2014.06.007
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发表时间：
2014-09-01
影响因子：
3.5
通讯作者：
Grosjean, Olivier
中科院分区：
文献类型：
--
作者：
Moric, Igor;Laurent, Philippe;Grosjean, Olivier
PHARAO是一种基于激光冷却铯原子的原子钟。为了衰减轨道磁场波动，PHARAO钟采用三个同心的Mumetal磁屏蔽与多个线圈相结合来改善磁场均匀性。我们的特点是用于建立飞行模型的屏蔽的衰减和磁场均匀性。当外场与轨道场相近（30 μ T），场均匀性低于10 nT时，三个屏蔽体内部的衰减平均值约为18，000。在空间鉴定的振动和热试验后，这些值没有变化。分析了屏蔽层磁导率随磁通量的变化规律。(C)2014年IAA。由爱思唯尔有限公司出版。保留所有权利。
The space clock PHARAO is an atomic clock based on laser cooled cesium atoms. In order to attenuate magnetic field fluctuation in orbit, PHARAO clock uses three concentric Mumetal magnetic shields combined with several coils to improve the field homogeneity. We have characterized the attenuation and magnetic field homogeneity of the shields used to build the flight model. The average value of attenuation inside the three shields is around 18,000 when the external field is similar to the orbit field (30 mu T) and the field homogeneity is lower than 10 nT. These values have not changed after vibrations and thermal tests for the space qualification. Permeability variation of the shields as a function of the intercepted flux has been analyzed. (C) 2014 IAA. Published by Elsevier Ltd. All rights reserved.