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In the field of directional dark matter experiments, SF6 has emerged as anideal target gas. A critical challenge with this gas, and with other proposedgases, is the effective removal of contaminant gases. This includes radon,which can produce unwanted background events, and common pollutants such aswater, oxygen, and nitrogen, which can capture ionisation electrons, resultingin a loss of detector gas gain over time. We present here a novel molecularsieve (MS) based gas recycling system for the simultaneous removal of bothradon and common impurities from SF6. The apparatus has the additional benefitof minimising gas required in experiments and utilises a Vacuum SwingAdsorption (VSA) technique for continuous, long-term operation. The gassystem's capabilities were tested with a 100 L low-pressure SF6 Time ProjectionChamber (TPC) detector. For the first time, we present a newly developedlow-radioactive MS type 5A. This material was found to emanate radon at 98%less per radon captured compared to commercial counterparts, the lowest knownMS emanation at the time of writing, resulting in a radon activity in the TPCdetector reduced to 0.8 +/- 6.4 mBq, which corresponds to an upper limit of 7.2mBq at a 95% confidence level (C.L.). Incorporation of MS types 3A and 4A toabsorb common pollutants was found successfully to mitigate against gaindeterioration while recycling the target gas.

Molecular sieve vacuum swing adsorption purification and radon reduction system for gaseous dark matter and rare-event detectors