SuperCDMS Development Project: Detectors: Superconducting Electronics Systems R&D

明尼苏达州苏丹地下矿的CDMS(低温暗物质搜索)II实验目前在搜索直接探测暗物质粒子方面处于领先地位，暗物质粒子显然构成了宇宙质量的四分之一。由于对CDMS-II最近改进的WIMP(弱相互作用大质量粒子)搜索限制的极大兴趣和兴奋，该合作正在考虑探索可能的WIMP横截面的更大区域的方法。显然，有相当大的科学兴趣安装实验，最终灵敏度达到当前限制的一千倍以上，这一水平将测试理论上允许的大部分参数空间。其中一些目标将通过CDMS-II的继续运行来实现，但在达到预期水平之前，这将成为背景限制。然而，CDMS-II技术能够通过大幅增加质量、减少背景事件并转移到更深的地下场所来达到这种灵敏度水平。随着探测器制造和测试方面的持续发展努力，以及旨在识别和减少本底的协调计划，一个25公斤探测器质量的实验可能在2008年投入使用。这项试验的低温系统计划允许进一步扩大，以便在大规模生产和测试探测器方面的进一步改进可以使探测器质量分阶段增加到1000公斤。CDMS-II合作提议继续运行该装置直到2006年底，以获得该装置可达到的最佳限度。与此同时，一个探测器研发项目将继续开发SuperCDMS，这是一个25公斤的探测器，将安装在加拿大萨德伯里中微子天文台实验室。科罗拉多大学丹佛分校和健康科学中心的这项个人提案代表了对PI为改进探测器技术和提高灵敏度而长期开发低温电子系统的请求。这项长期工作包括三个方面：两级超导量子干涉装置(SQUID)前置放大器的开发，SQUID电荷读出的开发，以及向合作小组传播SQID操作专业知识。这项拟议的长期活动的智力价值是a)开发改进的暗物质探测器和系统，b)加强合作NSF机构之间的合作，以及c)对使能技术(SQUID)的广泛支持，该使能技术对许多额外的科学计划很重要，拟议活动产生的更广泛影响包括a)非传统学生群体中的本科生教育，以及b)这些学生与其他机构的研究生和博士后之间的互动，鼓励这些学生考虑研究生教育，因为他们在科学和工程领域的代表性普遍不足。

The CDMS (Cryogenic Dark Matter Search) II experiment at the Soudan Underground Mine in Minnesota currently leads the field in the search for direct detection of the dark matter particles that apparently constitute a quarter of the mass of the universe. Motivated by the great interest and excitement over the recent improved WIMP (Weakly Interacting Massive Particle) search limits from CDMS-II, the collaboration is considering ways to explore substantially greater regions of possible WIMP cross sections. It is clear that there is substantial scientific interest in mounting experiments with an eventual sensitivity reach more than a factor of a thousand beyond the current limits, a level that would test much of the theoretically allowed parameter space. Some of this will be achieved with continued running of CDMS-II, but that will become background limited before it can reach the desired level. However, the CDMS-II technology is capable of reaching this level of sensitivity with a substantial increase in mass, reduction in background events, and relocation to a deeper underground site.With continued development efforts in detector fabrication and testing, and a coordinated program aimed at background identification and reduction, an experiment with 25 kg of detector mass could be operational by 2008. The cryogenics system of this experiment would be planned to allow further expansion, so that additional improvements in mass production and testing of detectors could yield a phased increase in detector mass up to 1000 kg.The CDMS-II collaboration proposes to continue running that apparatus to the end of 2006 to obtain the best limit achievable with that apparatus. Concurrently, a detector R&D project will proceed to develop SuperCDMS, the 25 kg detector, to be housed in the Sudbury Neutrino Observatory Laboratory in Canada. This individual proposal from the University of Colorado at Denver and Health Sciences Center represents a request for support of the PI's long-term development of cryogenic electronics systems for improved detector technology and increased sensitivity. There are three aspects to the long-term work: 2-stage superconducting quantum interference device (SQUID) pre-amplifier development, SQUID charge-readout development, and dissemination of SQUID operational expertise to collaborating groups.The intellectual merit of this proposed long-term activity is a) development of improved dark-matter detectors and systems, b) increased collaboration between cooperating NSF institutions, and c) broad support of an enabling technology (SQUIDs) which is important to a number of additional scientific programs, including novel SQUID devices and electronics development.The broader impacts resulting from the proposed activity include a) undergraduate education in a non-traditional student population and b) interactions between those students and graduate students and post-docs at from other institutions, encouraging consideration of graduate education by these students science and engineering fields in which they are generally under-represented.