Collaborative Research: ADMX-HF Early Start

所有的天体物理学和宇宙学数据现在都令人信服地指向宇宙中冷暗物质（CDM）的大部分，但暗物质粒子尚未被直接检测到。 一个动机良好的可能候选者是轻轴子。 如果轴子构成了我们银河系晕的暗物质，它们可以通过由磁场渗透的微波空腔谐振器组成的设备将其转换为窄微波信号来检测。 利用这个概念，轴子暗物质实验（ADMX）已经在几微电子伏特的质量范围内搜索了这样的轴子。 最近，一个更小的微波腔实验被称为ADMX-HF（高频），专门用于探索更高范围的轴子质量。 ADMX-HF还可作为微波谐振腔和放大器技术创新的测试平台，这些技术可迁移到更大的ADMX平台。 ADMX-HF和ADMX作为“一个实验，两个站点”运行，共享专业知识、技术和数据。 该合同将扩大双方的合作，以加快ADMX-HF的建设，并大幅提高其初始能力。更广泛的影响：ADMX已被证明是一种技术驱动力，因为为ADMX开发的SQUID放大器等组件已被用于其他用途。 ADMX-HF将开发的创新具有类似的广泛潜力。 PI和Co-PI都是致力于教育工作者，在让本科生参与研究和吸引公众方面拥有长期经验。 通过该奖项资助的研究将为他们参与的其他教育和外联活动提供信息。

All astrophysical and cosmological data now point convincingly to a large component of Cold Dark Matter (CDM) in the Universe, but a dark matter particle has yet to be directly detected. A well-motivated possible candidate is a light axion. Should axions constitute the dark matter of our Milky Way halo, they may be detected through their conversion into a narrow microwave signal by an apparatus consisting of a microwave cavity resonator permeated by a magnetic field. Using this concept the Axion Dark Matter eXperiment (ADMX) has performed a search for such axions within the mass range of a few micro-eV. Recently a smaller microwave cavity experiment was constructed called ADMX-HF (High Frequency), specifically to explore higher ranges of axion masses. ADMX-HF also serves as a test-bed for innovations in microwave cavity and amplifier technologies that could be migrated to the larger ADMX platform. ADMX-HF and ADMX operate as "one experiment, two sites", sharing expertise, technology, and data. This award will expand the collaboration to accelerate the construction of ADMX-HF as well as dramatically expand its initial capability.Broader Impacts: ADMX has proven to be a technology driver as components such as the SQUID amplifiers developed for ADMX are already being used for other purposes. Innovations to be developed by ADMX-HF have similarly broad potential. Both PI and Co-PI are committed educators with long experience in involving undergraduate students in their research and engaging the public. The research funded through this award will inform additional education and outreach initiatives with which they are involved.