氦-3的魔装演示
Demonstration of magic dressing of $^3$He
AI总结：
该研究通过魔装饰方法实现了氦-3和中子旋磁比的临界装饰，提高了磁场梯度下的横向弛豫时间。
摘要：
在高精度中子电偶极矩（nEDM）实验中，一个常见的担忧是磁场稳定性的问题。对于静态磁场，可以通过使用超导保持磁场线圈来缓解这个问题，当该线圈以持久电流模式运行时，可以稳定磁场。然而，当存在时间变化磁场时，这种解决方案不可行，例如在所提出的nEDMSF（nEDM超流）实验的自旋装饰模式中。该实验特征是振荡磁场以使氦-3和中子的旋磁比达到相同值，这一条件称为临界装饰。装饰磁场振幅的波动可能会破坏这一条件。在这里，我们研究了一种修改的自旋装饰，称为"魔装饰"，它使系统对小幅度装饰磁场波动不敏感。我们进一步通过极化氦-3样品演示了该方法在单自旋物种情况下的实用性。我们发现，在存在磁场梯度的情况下，横向弛豫时间显著增加。
英文摘要：
A common concern in high-precision neutron electric dipole moment (nEDM) experiments is that of magnetic field stability. For static fields, this problem can be mitigated through the use of a superconducting holding field coil, which when operated in persistent current mode serves to stabilize the magnetic field. However, such a solution is not viable when time-varying magnetic fields are present, as is the case for the spin dressing mode of the proposed nEDMSF (nEDM super-fluid) experiment. This experiment features an oscillating magnetic field to dress the gyromagnetic ratios of $^3$He and neutrons to the same value, a condition known as critical dressing. Fluctuations in the dressing field amplitude have the potential to disrupt this condition. Here, we investigate a modification to spin dressing, termed ``magic dressing,'' which renders the system insensitive to small variations in dressing field amplitude. We further demonstrate the utility of this method for the single spin-species case using a sample of polarized $^3$He. We find a dramatic increase in transverse relaxation time in the presence of magnetic field gradients.
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