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arXiv 1405.6853physics.ins-det
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用于强磁场测量的超灵敏~ 3 He磁强计

Ultrasensitive 3He magnetometer for measurements of high magnetic fields

A. Nikiel, P. Blümler, W. Heil, M. Hehn, S. Karpuk, A. Maul, E. Otten, L. M. Schreiber, M. Terekhov

摘要:

我们描述了一种能够测量高磁场(B > 0.1特斯拉)的3 He磁力计,其相对精度优于10^-12。我们的方法是基于测量的自由感应衰变的气体,核自旋极化3 He以下的共振射频脉冲激发。测量灵敏度可以归因于长相干自旋进动时间T2* 为分钟级,这是在运动变窄的制度中实现的,其中场不均匀性的干扰影响被强烈抑制。3 He气体是自旋极化原位使用一种新的,非标准的变体的亚稳态交换光泵浦。我们发现,小型化有助于进一步提高T2*,并且测量灵敏度不会受到10^-4量级的时间场波动的显著影响。

英文摘要:

We describe a 3He magnetometer capable to measure high magnetic fields (B > 0.1 Tesla) with a relative accuracy of better than 10^-12. Our approach is based on the measurement of the free induction decay of gaseous, nuclear spin polarized 3He following a resonant radio frequency pulse excitation. The measurement sensitivity can be attributed to the long coherent spin precession time T2* being of order minutes which is achieved for spherical sample cells in the regime of motional narrowing where the disturbing influence of field inhomogeneities is strongly suppressed. The 3He gas is spin polarized in-situ using a new, non-standard variant of the metastability exchange optical pumping. We show that miniaturization helps to increase T2* further and that the measurement sensitivity is not significantly affected by temporal field fluctuations of order 10^-4.

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