论文标题
通过分散杂交宏伟的镁质传感器测定niobium腔磁场筛选
Determination of Niobium Cavity Magnetic Field Screening via a Dispersively Hybridized Magnonic Sensor
论文作者
论文摘要
提出了一种确定超导腔内内部直流磁场的方法。该方法依赖于铁磁球的磁场和频率之间的关系，该模式在超导腔的分散状态中杂交。结果被用来通过实验确定筛选超导型NB腔提供的水平，因为它从完美的磁磁性变为没有筛选。测试了两个空腔几何形状，一个气缸和单个后腔。两者都表现出进入腔体的一致值，预计将是过热的临界场。还观察到由于被困涡旋而引起的外部磁场的渐变磁场中的磁滞。在圆柱腔中观察到一些异常行为，以第一个临界场的内部场中的高原形式观察到，我们讨论了这种行为的潜在起源。测量方法将是斧头暗物质搜索的有用诊断，该搜索计划使用超导材料，但需要精确知道内部磁场。
A method for determining the internal DC magnetic field inside a superconducting cavity is presented. The method relies on the relationship between magnetic field and frequency of the Kittel mode of a ferrimagnetic sphere, hybridised in the dispersive regime of the superconducting cavity. Results were used to experimentally determine the level of screening a superconducting Nb cavity provides as it changes from perfect diamagnetism to no screening. Two cavity geometries were tested, a cylinder and single post re-entrant cavity. Both demonstrated a consistent value of field that enters the cavity, expected to be the superheating critical field. Hysteresis in the screened field during ramp up and ramp down of the external magnetic field due to trapped vortices was also observed. Some abnormal behaviour was observed in the cylindrical cavity in the form of plateaus in the internal field above the first critical field, and we discuss the potential origin of this behaviour. The measurement approach would be a useful diagnostic for axion dark matter searches, which plan on using superconducting materials but need to know precisely the internal magnetic field.
