论文标题
铁磁轴卤体的建筑说明
Building instructions for a ferromagnetic axion haloscope
论文作者
论文摘要
铁磁卤素化是一种RF自旋磁力仪，用于以轴的形式搜索暗物质。监视磁性材料以搜索可以通过暗物质轴诱导的异常磁化振荡。要正确设计这种仪器，首先需要了解搜索信号的特征，即暗物质轴的有效RF场$ b_a $作用于电子自旋。一旦定义了$ b_a $的属性，便可以启动设备的设计和测试。最佳样品是狭窄的线宽和高自旋密度材料，例如Yttrium Iron Garnet（YIG），与微波炉耦合，几乎匹配的线宽以收集信号。使用天线收集谐振器中的功率，并用Josephson参数放大器放大，这是一种量子限制的设备，但是，它增加了大多数设置噪声。信号通过低噪声下摆进一步扩增，并通过异差接收器向下转换以存储。这项工作描述了如何构建所有实验细节，可能面临的主要问题以及一些解决方案。
A ferromagnetic haloscope is a rf spin-magnetometer used for searching Dark Matter in the form of axions. A magnetic material is monitored searching for anomalous magnetization oscillations which can be induced by dark matter axions. To properly devise such instrument one first needs to understand the features of the searched-for signal, namely the effective rf field of dark matter axions $B_a$ acting on electronic spins. Once the properties of $B_a$ are defined, the design and test of the apparatus may start. The optimal sample is a narrow linewidth and high spin-density material such as Yttrium Iron Garnet (YIG), coupled to a microwave cavity with almost matched linewidth to collect the signal. The power in the resonator is collected with an antenna and amplified with a Josephson Parametric amplifier, a quantum-limited device which, however, adds most of the setup noise. The signal is further amplified with low noise HEMT and down-converted for storage with an heterodyne receiver. This work describes how to build such apparatus, with all the experimental details, the main issues one might face, and some solutions.
