Readout Systems for Cryogenic Dark Matter Detectors/SuperCDMS SNOLAB

多项天文观测已经确定，宇宙中大约85%的物质不是由正常原子组成的，而是不发射或吸收光的未被检测到的基本“暗物质”粒子。破译这种所谓的暗物质的性质对宇宙学、天体物理学和高能粒子物理学具有根本的重要性。一个主要的假设是，它是由弱相互作用大质量粒子（WIMP）组成的，这些粒子是在大爆炸后产生的。如果WIMP是暗物质，那么它们在我们星系中的存在可能是通过位于地下深处的探测器中的原子核散射来检测的，以帮助排除宇宙射线造成的背景。对WIMP暗物质的直接探测将解决粒子物理学和宇宙学中的一个基本谜团，为了解宇宙的主要物质组成和粒子物理学标准模型之外的物理学提供了一个独特的窗口。该奖项将支持在SuperCDMS SNOLAB实验中工作的学生和科学家，该实验旨在在1-10 GeV/c2质量范围内实现世界领先的暗物质搜索灵敏度。SuperCDMS SNOLAB实验的影响超出了对暗物质的搜索。CU Denver集团通过全面参与所有研发活动，为本科生提供研究生教育或技术领域的职业生涯。与PI密切合作的本科生将研究SuperCDMS SNOLAB SQUID对环境磁场的灵敏度以及在轻度屏蔽的磁性环境中操作时灵敏度的相关退化（噪声水平增加）。PI参加了与当地两所磁铁学校的外联活动。实验将设在加拿大安大略的SNOLAB，这是北美最深的地下实验室。这种支持将主要允许PI和他的学生履行该小组同意在合作范围内承担的具体责任。在合作职责中，丹佛大学是SuperCDMS SNOLAB和测试设施中使用的所有设备的制造后SQUID验证的主要设施，并积极参与读出电子设备的设计和测量。CU Denver集团将参与SuperCDMS SNOLAB的预操作和调试活动，特别是塔电子设备，读出电子设备和DAQ的集成，以及SNOLAB实验的安装和调试。

Multiple astronomical observations have established that about 85% of the matter in the universe is not made of normal atoms, but must be otherwise undetected elementary "dark matter" particles that do not emit or absorb light. Deciphering the nature of this so-called Dark Matter is of fundamental importance to cosmology, astrophysics, and high-energy particle physics. A leading hypothesis is that it is comprised of Weakly Interacting Massive Particles, or WIMPs, that were produced moments after the Big Bang. If WIMPs are the dark matter, then their presence in our galaxy may be detectable via scattering from atomic nuclei in detectors located deep underground to help reject backgrounds due to cosmic rays. Direct detection of WIMP dark matter would solve a fundamental mystery in particle physics and cosmology, providing a unique window to learning about the primary matter constituent of the Universe and of physics beyond the Standard Model of particle physics. This award will support students and scientists working on the SuperCDMS SNOLAB experiment that aims to achieve world-leading sensitivity for dark matter searches in the 1-10 GeV/c2 mass range.The impact of the SuperCDMS SNOLAB experiment extends beyond the search for dark matter. The CU Denver group prepares undergraduates for graduate education or careers in technical fields through their integral involvement in all R&D activities. Undergraduate students, working closely with the PI, will study the sensitivity of the SuperCDMS SNOLAB SQUIDs to ambient magnetic fields and the associated degradation of sensitivity (increased noise levels) when operated in a lightly-shielded magnetic environment. The PI participates in outreach activities with two local magnet schools. The experiment will be located at SNOLAB, in Ontario, Canada, the deepest underground laboratory in North America. This support will primarily allow the PI and his students to conduct the specific responsibilities this group has agreed to undertake within the collaboration. Among the collaboration responsibilities, CU Denver serves as the primary facility for post-fabrication SQUID verification of all devices to be used in SuperCDMS SNOLAB and test facilities, and is heavily involved in design of and measurements on the readout electronics. The CU Denver group will participate in the pre-operation and commissioning activities for SuperCDMS SNOLAB, specifically integration of the tower electronics, the readout electronics, and the DAQ, and installation and commissioning of the experiment at SNOLAB.