Determination of the separation efficiencies of a single-stage cryogenic distillation setup to remove krypton out of xenon by using a (83m)Kr tracer method.
Determination of the separation efficiencies of a single-stage cryogenic distillation setup to remove krypton out of xenon by using a (83m)Kr tracer method.
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DOI：
10.1063/1.4934978
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发表时间：
2015-11
期刊：
影响因子：
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通讯作者：
S. Rosendahl;E. Brown;I. Cristescu;A. Fieguth;C. Huhmann;O. Lebeda;M. Murra;C. Weinheimer
中科院分区：
文献类型：
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作者：
S. Rosendahl;E. Brown;I. Cristescu;A. Fieguth;C. Huhmann;O. Lebeda;M. Murra;C. Weinheimer
氪和氙的分离对于用液体氙探测器直接搜索暗物质的领域特别重要。氙与放射性（85）Kr的固有污染为这些类型的低计数率实验提供了重要的本底，并且必须预先去除。这可以通过工业上广泛使用的低温蒸馏技术来实现，利用氪和氙的不同蒸气压。本文用~（83）m氪示踪法研究了单级精馏系统的分离性能。对氙中极低浓度氪（~（83）m）Kr/Xe = 1.9 × 10 ~（-15））在不同操作条件下的分离特性进行了测定，表明低温精馏在此范围内是可行的。所观察到的分离与氪和氙的不同挥发性的预期一致。这个低温蒸馏站是下一代直接暗物质实验XENON 1 T的多级低温蒸馏塔的第一步。
The separation of krypton and xenon is of particular importance for the field of direct dark matter search with liquid xenon detectors. The intrinsic contamination of the xenon with radioactive (85)Kr makes a significant background for these kinds of low count-rate experiments and has to be removed beforehand. This can be achieved by cryogenic distillation, a technique widely used in industry, using the different vapor pressures of krypton and xenon. In this paper, we present an investigation on the separation performance of a single stage distillation system using a radioactive (83m)Kr-tracer method. The separation characteristics under different operation conditions are determined for very low concentrations of krypton in xenon at the level of (83m)Kr/Xe = 1.9 ⋅ 10(-15), demonstrating, that cryogenic distillation in this regime is working. The observed separation is in agreement with the expectation from the different volatilities of krypton and xenon. This cryogenic distillation station is the first step on the way to a multi-stage cryogenic distillation column for the next generation of direct dark matter experiment XENON1T.