Axion Dark Matter eXperiment at High Frequency (ADMX-HF)

所有天体物理和宇宙学数据现在都令人信服地指出，宇宙中有很大一部分冷暗物质(CDM)，其中光轴流子是一个有良好动机的候选者。人们早就知道，如果轴子是我们银河系晕暗物质的主要成分，那么它们可以通过将它们转换为窄带微波信号，由一个被磁场渗透的微波腔谐振器组成的设备来探测。自1996年以来，轴子暗物质实验(ADMX)一直在寻找轴子，在轴子模型的范围内实现了很好的灵敏度，排除了少数微电子伏范围内的质量。随着最近的技术进步，现在有可能将这些测量扩展到更高的频率。这一奖项将使耶鲁大学集团能够加入ADMX合作，并建立和运营第二个微波腔实验-高频ADMX(ADMX-HF)，以探测2-20 GHz(~8至80微eV)范围。这包括轴子的质量，它对应于宇宙物质密度的饱和度(~20微电子伏特)。在更广泛的影响中，ADMX已经被证明是尖端技术的驱动力；十多年前，NSF支持ADMX的近量子有限鱿鱼放大器的开发，该放大器很快成为IARPA(智能高级研究项目活动)在量子计算路线图中的关键一块。ADMX-HF同样可以利用耶鲁大学深厚的量子电子学能力，提供有益于基础科学和安全的新创新。私家侦探雇佣本科生从事他的研究的历史由来已久。

All astrophysical and cosmological data now point convincingly to a large component of Cold Dark Matter (CDM) in the Universe, for which a light axion is a well-motivated candidate. It has long been known that if axions are a primary constituent of the dark matter of our own Milky Way halo, they may be detected through their conversion into a narrow-band microwave signal by an apparatus consisting of a microwave-cavity resonator permeated by a magnetic field. Since 1996, the Axion Dark Matter eXperiment (ADMX) has been searching for axions, achieving sensitivities well within the band of axion models, excluding masses in the few micro-eV range. With recent technological advances, it is now possible to extend these measurements to higher frequencies. This award will enable the Yale group to join the ADMX collaboration and to build and operate a second microwave cavity experiment, ADMX at High Frequencies (ADMX-HF), to probe the 2-20 GHz (~8 to 80 micro-eV) range. This brackets the mass of the axion which corresponds to saturation of the matter density of the universe (~ 20 micro-eV). ADMX as "one experiment, two sites" will thus be able to pursue a two-prong strategy, simultaneously pushing downwards in the axion-photon coupling and upwards in mass.In Broader Impacts, ADMX has already proven to be a driver of leading-edge technology; NSF supported the development of the near-quantum limited SQUID amplifiers for ADMX more than a decade ago, which quickly spun off to become a critical piece of IARPA's (Intelligence Advanced Research Projects Activity) roadmap in quantum computing. ADMX-HF can similarly be expected to draw from the deep quantum electronics competency at Yale to provide new innovations benefiting basic science and security. The PI has a long history of employing undergraduates to work on his research.