DUSEL Research and Development on subKelvin germanium for ton scale dark matter search

提案编号：0705078机构：加州大学？Berkeley NSF认证：物理-粒子天体物理学基本粒子探测器：Sadoulet，Bernard标题：DUSEL研究和开发用于吨级暗物质搜索的亚开尔文锗 破译宇宙中暗物质的本质是当今宇宙学和粒子物理学中最紧迫的任务之一，而探测弱相互作用大质量粒子（WIMPs）的成功计划关键取决于可用仪器的性能。该提案要求提供支持，以便能够改进深层地下科学和工程实验室今后的实验。这一努力旨在提高声子介导加电离检测器技术的位置分辨率和抑制能力，该技术目前达到最佳WIMP灵敏度，因此可能为吨级暗物质实验开辟新的科学机会。加州大学伯克利分校的研究小组是超级CDMS合作项目的成员之一，该项目将在SNOLAB地下实验室操作25公斤的锗亚开尔文探测器，目标是对自旋无关截面和近60 GeV的WIMP质量达到接近10^（#8722;45）cm ^2的灵敏度。这样的灵敏度范围在科学上非常重要，并且探索了与大型强子对撞机相同的参数空间，用于以最轻的超对称粒子形式的超对称暗物质。DUSEL设施可能最早在2012年或2013年准备好进行实验，并且在科学上重要的是建立至少一个吨级暗物质实验，以进一步提高WIMP的灵敏度。在2009-2010年左右选择最好的一两种技术是很自然的，最有可能的是亚开尔文和惰性液体战略。对于亚开尔文技术，需要改进背景抑制并开发大规模生产技术以降低成本并增加制造产量。在这个为期三年的建议，支持一个博士后研究员和一个本科生的要求。这种适度的支持将使该小组能够制造和测试几种探测器设计。CDMS团队一直处于声子介导和超导体探测器开发的最前沿，这已经产生了广泛的影响，特别是在宇宙微波背景和X射线天体物理学领域。拟议的努力可能会扩大这一影响。

PROPOSAL NUMBER: 0705078INSTITUTION: University of California ? Berkeley NSF PROGRAM: PHY - PARTICLE ASTROPHYSICSPRINCIPAL INVESTIGATOR: Sadoulet, BernardTITLE: DUSEL Research and Development on subKelvin germanium for ton scale dark matter search ABSTRACTDeciphering the nature of dark matter in the universe is one of the most urgent tasks in cosmology and particle physics today, and a successful program to detect Weakly Interactive Massive Particles (WIMPs) critically depends on the performance of the instrumentation available. This proposal requests support to enable improved future experiments for the Deep Underground Science and Engineering Laboratory (DUSEL). This effort is directed at improving the position resolution and rejection capability of the phonon-mediated plus ionization detector technology, which currently reaches the best WIMP sensitivity, and therefore is likely to open new scientific opportunities for a ton scale dark matter experiment. The UC Berkeley group is a member of the SuperCDMS collaboration which will operate 25 kg of germanium sub-Kelvin detectors at the SNOLAB underground laboratory, aiming to reach a sensitivity approaching 10^(−45) cm^2 for spin independent cross sections and WIMP masses near 60 GeV. Such a sensitivity reach is scientifically very important and explores much of the same parameter space as the Large Hadron Collider for supersymmetric dark matter in the form of the lightest supersymmetric particle. The DUSEL facility may be ready for experiments as early as 2012 or 2013 and it will be scientifically important to build at least one ton-scale dark matter experiment to improve further the sensitivity for WIMPs. It is natural to select the best one or two technologies around 2009-2010, most likely the sub-Kelvin and noble liquid strategies. For the sub-Kelvin technology, there is a need to improve background rejection and to develop mass production techniques to reduce costs and increase fabrication yields. In this three-year proposal, support is requested for one postdoctoral fellow and one undergraduate. This modest level of support will allow the group to fabricate and test several detector designs. The CDMS team has been at the forefront of phonon-mediated and superconductor detector development, which already has broad impacts, in particular in the fields of Cosmic Microwave Background and of X-ray astrophysics. The proposed effort is likely to broaden this impact.