Dark Matter search with cryogenic detectors: contributions to CDMS and SuperCDMS

压倒性的观测证据告诉我们，我们在宇宙中看到的只是现有物质的一小部分。大部分物质不仅是看不见的，而且是一种全新的类型。寻找这种“暗物质”是当今基础物理研究中最迷人、最具挑战性的实验工作之一。人们认为暗物质粒子很少与普通物质发生相互作用。因此，在寻找这些粒子时，必须尽可能减少其他相互作用粒子（宇宙辐射、天然放射性）的影响。CDMS（低温暗物质搜索）是目前在该领域处于世界领先地位的，它在地下深处运行非常敏感的低温（低温）探测器，以减少宇宙辐射的影响，并在一个厚厚的屏蔽层内防止周围环境中的微量放射性。复杂的探测器能够区分来自暗物质粒子的预期相互作用和来自已知粒子的相互作用，尽管所有的努力都能穿透屏蔽。CDMS正计划将下一阶段（“超级CDMS”）转移到安大略省萨德伯里附近新建的SNOLAB，该实验室比目前的CDMS实验地点提供更好的屏蔽宇宙辐射和更清洁（相对于放射性痕量污染）的环境。该项目通过建立和运行一个设施来为CDMS实验做出贡献，该设施将提供低温和操作复杂的CDMS探测器所需的所有电子设备。该设施将用于测试和表征目前正在为实验的下一阶段开发的探测器，然后将其部署在最终设置中。女王大学和SNOLAB之间的紧密联系将极大地有利于在新址安装实验。该项目允许加拿大为世界领先的前沿基础研究实验做出重大贡献。

Overwhelming observational evidence tells us, that what we see in the Universe is only a small fraction of the existing matter. Most of the matter is not only invisible, but of a completely new type. The search for this "Dark Matter" is one of the most fascinating and challenging experimental efforts pursued in present day fundamental physics research.     Dark Matter particles are expected to only very rarely interact with ordinary matter. Therefore the influence of other interacting particle (cosmic radiation, natural radioactivity) has to be reduced as much as possible when searching for these particles. CDMS (Cryogenic Dark Matter Search) which is presently world-leading in this field  operates very sensitive low temperature (cryogenic) detectors deep underground to reduce the influence of cosmic radiation, and inside a heavy shielding against trace radioactivity in the surroundings. The complex detectors are capable of distinguishing between the expected interactions from the Dark Matter particles and interactions from known particles which despite all the effort manage to penetrate the shielding.     CDMS is planning to move for the next phase ("SuperCDMS") to the newly built SNOLAB near Sudbury, Ontario, which provides better shielding against cosmic radiation and a cleaner (with respect to radioactive trace contaminations) environment than the present location of the CDMS experiment     This project contributes to the CDMS experiment by setting up and running a facility which will provide the low temperatures and all electronics necessary to operate the complex CDMS detectors. This facility will be used to test and characterize the detectors that are presently being developed for the next phase of the experiment, before they are deployed in the final setup. The close connection between Queen's University and SNOLAB will greatly benefit the installation of the experiment at the new site. This project allows a significant Canadian contribution to a world-leading experiment in cutting edge fundamental research.