Design Considerations for Large Mass Ultra-Low Background Experiments

[摘要] Summary The objective of this document is to present the designers of the next generation of large-mass, ultra-low background experiments with lessons learned and design strategies from previous experimental work. Design issues divided by topic into mechanical, thermal and electrical requirements are addressed. Large mass low-background experiments have been recognized by the scientific community as appropriate tools to aid in the refinement of the standard model. The design of these experiments is very costly and a rigorous engineering review is required for their success. The extreme conditions that the components of the experiment must withstand (heavy shielding, vacuum/pressure and temperature gradients), in combination with unprecedented noise levels, necessitate engineering guidance to support quality construction and safe operating conditions. Physical properties and analytical results of typical construction materials are presented. Design considerations for achieving ultra-low-noise data acquisition systems are addressed. Five large-mass, low-background conceptual designs for the one-tonne scale germanium experiment are proposed and analyzed. The result is a series of recommendations for future experiments engineering and for the Majorana simulation task group to evaluate the different design approaches.

[发布日期] 2011-07-01

[学科分类] 物理（综合）

[关键词] CONSTRUCTION;DATA ACQUISITION SYSTEMS;DESIGN;GERMANIUM;PHYSICAL PROPERTIES;RECOMMENDATIONS;SHIELDING;SIMULATION;STANDARD MODEL 1TGe One-tonne 76Ge neutrinoless double beta-decay experiment;DAQ data acquisition;EFCu Electroformed copper;FEA finite element analysis;FEE front-end electronics;FET field-effect transistor;HPGe high purity germanium;LAr liquid argon;LN liquid nitrogen;MJD MAJORANA Demonstrator;OHFC oxygen/halogen-free copper;PNNL Pacific Northwest National Laboratory;RTD resistive thermal device