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

SuperCDMS 开发项目：探测器：超导电子系统 R

• 批准号: 0503641
• 负责人: Martin Huber
• 金额: --
• 依托单位: University of Colorado at Denver-Downtown Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-11-01 至 2010-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0503641&HistoricalAwards=false
• 关键词: SuperCDMS; Development; Project; Detectors; Superconducting

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.

在明尼苏达州的苏丹地下矿进行的CDMS（低温暗物质搜索）II实验目前在寻找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。很明显，在进行最终灵敏度超过当前极限一千倍以上的实验时，有很大的科学兴趣，这一水平将测试理论上允许的大部分参数空间。其中一些将通过继续运行CDMS-II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、减少背景事件和搬迁到更深的地下地点来达到这种灵敏度水平。随着探测器制造和测试的不断发展努力，以及旨在识别和减少背景的协调计划，一个25公斤探测器质量的实验可以在2008年投入使用。该实验的低温系统计划允许进一步扩展，以便在大规模生产和探测器测试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合作计划建议继续运行该仪器至2006年底，以获得该仪器可达到的最佳极限。同时，一个探测器研发项目将继续开发超级cdms，这是一个25公斤的探测器，将被安置在加拿大的萨德伯里中微子天文台实验室。来自丹佛科罗拉多大学和健康科学中心的个人提案代表了PI对低温电子系统长期发展的支持，以改进探测器技术和提高灵敏度。长期工作包括三个方面：两级超导量子干涉器件（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SQUID操作专业知识。这项提议的长期活动的智力价值在于：a)改进暗物质探测器和系统的发展；b)加强合作的NSF机构之间的合作；c)对一种使能技术（SQUID）的广泛支持，这对许多其他科学项目很重要，包括新型SQUID设备和电子开发。提议的活动所产生的更广泛的影响包括：a)非传统学生群体的本科教育；b)这些学生与其他机构的研究生和博士后之间的互动，鼓励这些学生考虑在他们通常代表性不足的科学和工程领域接受研究生教育。