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arXiv · 2501.10993

Improved and automated krypton assay for low-background xenon detectors with Auto-RGMS

Matteo Guida·Ying-Ting Lin·Hardy Simgen
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Abstract

Ultra-sensitive quantification of trace radioactive krypton-85 is essential for low-background experiments, particularly for next-generation searches of galactic dark matter and neutrino physics using xenon-based time projection chambers (TPCs). While the rare gas mass spectrometer (RGMS) represents the current state-of-the-art for krypton detection in the field, we are developing a fully automated system (Auto-RGMS) to overcome the limitations of its manual operation. Auto-RGMS incorporates a robust control system for rapid measurements and minimized systematic uncertainties. A primary goal is to reach detection limits in the low parts-per-quadrillion (ppq) range for natural krypton by improving the chromatography stage to enhance the separation of krypton from xenon. Investigations into various adsorbent materials identified two candidates. HayeSep Q offers a 12-fold improvement in chromatographic resolution for xenon/krypton separation compared to the previously used adsorbent. Alternatively, HayeSep D provides a more limited improvement in resolution while allowing a higher measurement frequency because of its moderate retention-induced contamination after each measurement. By automating krypton assays and achieving ppq sensitivity, Auto-RGMS will be an indispensable tool for next-generation detectors, maximizing their scientific potential.

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Matteo Guida, Ying-Ting Lin, Hardy Simgen. 2025-01-19. Improved and automated krypton assay for low-background xenon detectors with Auto-RGMS. https://doi.org/10.1140/epjc/s10052-025-14262-2

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