SuperCDMS SNOLAB construction

天体物理学的证据清楚地证明了“暗物质”的存在，它本质上是非重子的，但在银河系和更大的尺度上具有重要的引力作用。20年来的努力至今未能确定暗物质的性质，无法在专用粒子探测器中寻找暗物质粒子与普通物质的直接相互作用，也无法在宇宙辐射中寻找暗物质湮灭的衰变产物，或在大型强子对撞机中寻找这种粒子产生的特征。这激发了新的更灵敏的实验，探索更广泛的暗物质参数空间。 SuperCDMS SNOLAB是一项新批准的实验，由美国能源部和NSF以及加拿大的CFI提供资金，将对质量低于10 GeV/c²的弱相互作用大质量粒子（WIMP）具有世界上最好的灵敏度。SuperCDMS使用低温半导体探测器实现超低能量阈值，并具有强大的背景抑制能力。它为大多数其他技术无法探测的低质量WIMP探测打开了一扇窗口。与苏丹地下实验室目前运行的装置相比，SNOLAB的这一新实验将大大增加目标质量，并显著降低能量阈值，为最低质量WIMP提供上级灵敏度。 该提案要求在建造超级CDMS SNOLAB的关键时期为加拿大超级CDMS集团提供业务资金。加拿大小组成员主要负责新SNOLAB实验的数据采集、触发、实验基础设施和探测器测试。申请的资金将用于支持皇后大学和不列颠哥伦比亚大学的博士后研究员和研究生，建设阶段小组成员前往萨德伯里的差旅费，以及合作会议，访问合作机构和会议旅行。

Astrophysical evidence clearly demonstrates the existence of "dark matter" that is non-baryonic in nature but gravitationally significant at galactic and larger scales. Two decades of dedicated effort have so far failed to identify the nature of dark matter in searches for direct interactions of dark matter particles with ordinary matter in dedicated particle detectors, for decay products of dark matter annihilation in cosmic radiation or for signatures of the production of such particles at the Large Hadron Collider. This motivates new more sensitive experiments probing over a wider range of dark matter parameter space. SuperCDMS SNOLAB is a newly approved experiment, with capital funding from DOE and NSF in the US and CFI in Canada, that will have the world's best sensitivity to Weakly Interacting Massive Particles (WIMPs) with masses below ~10 GeV/c². SuperCDMS uses cryogenic semiconductor detectors to achieve ultra-low energy thresholds and has a strong, proven background rejection. It opens a window to low mass WIMP detection that cannot be probed by most other technologies. This new experiment at SNOLAB will have considerably increased target mass compared to the presently operating setup at the Soudan Underground Laboratory, as well as a significantly decreased energy threshold, providing superior sensitivity to the lowest mass WIMPs. This proposal requests operating funds for the Canadian SuperCDMS groups over the critical period during which SuperCDMS SNOLAB will be constructed. Canadian group members have key responsibility for data acquisition, trigger, experiment infrastructure, and detector testing for the new SNOLAB experiment. The requested funds will support postdoctoral fellows and graduate students at Queen's University and UBC, travel costs for group members to Sudbury during the construction phase, as well as collaboration meetings, visits to collaborating institutions and conference travel.