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。大多数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引人入胜、最具挑战性的实验努力之一。新发现的暗物质粒子预计只会极少与普通物质相互作用。因此，在寻找其他相互作用的粒子(宇宙辐射、自然放射性)时，必须尽可能减少这些粒子的影响。CDMS(低温暗物质搜索)目前在该领域处于世界领先地位，它在地下深处运行非常灵敏的低温(低温)探测器，以减少宇宙辐射的影响，并在厚重的屏蔽层内抵御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，尽管付出了所有努力，已知粒子仍设法穿透屏蔽层。加拿大CDMS正计划在下一阶段(“SuperCDMS”)转移到安大略省萨德伯里附近新建的SNOLAB，该实验室提供更好的宇宙辐射屏蔽和更清洁的环境(关于放射性痕量污染)。CDMS实验的当前位置。该项目通过建立和运行一个设施，提供操作复杂的CDMS探测器所需的低温和所有电子设备，从而为CDMS实验做出贡献。这一设施将用于测试和表征目前正在为下一阶段实验开发的探测器，然后再将其部署到最终设置中。皇后大学和SNOLAB之间的密切联系将极大地有利于在新地点安装实验。该项目允许加拿大为世界领先的尖端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.