PoS - Proceedings of Science
Volume 380 - Particles and Nuclei International Conference 2021 (PANIC2021) - Development of accelerators and detectors
Purification of large volume of liquid argon for LEGEND-200
M. Haranczyk*, M. Harańczyk", N. Burlac", N. Di Marco", P. Krauze", T. Mróz", L. Papp", G. Salamanna", S. Schönert", M. Schwarz", D. Tagnani", S. Tombiński", C. Vogl" and G. Zuzel"
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Pre-published on: March 17, 2022
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Abstract
The design, construction and performance of the system capable of purifying 65m3 of liquid argon to sub-ppm level designed for LEGEND – 200 experiment is presented. The quality of the purified liquid argon is monitored in real-time during the purification process, by measuring the argon triplet state lifetime and simultaneous direct measurements of the concentrations of impurities such as water, oxygen, and nitrogen with a sensitivity of 0.1 ppm. The achieved argon triplet lifetime value measured inside the LEGEND cryostat, when filled in 70% of its capacity, was at the level of τ3 = 1.3 μs. If needed, the system may also be used later to purify liquid argon already filled into the LEGEND cryostat in the loop mode.
DOI: https://doi.org/10.22323/1.380.0102
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