Dark Matter Detection: LUX-ZEPLIN and HydroX

The LUX-ZEPLIN (LZ) experiment is working to detect dark matter in the form of weakly interacting massive particles (WIMPs). The detector uses ten tonnes of liquid xenon and an external veto detector to observe WIMP interactions. With 280 days of data, LZ is the most sensitive dark matter detector in the world. HydroX is an idea to improve LZ's sensitivity to lower mass dark matter by dissolving hydrogen into the xenon. The upgrade takes advantage of the detector's low background rate and is expected to result in a 5x signal boost in the light-dark matter mass regime. In this talk, I will discuss the "Henry Machine" at UCSB where we are investigating detector properties and the cryogenics involved in the mixing, stratification, and stability of light gas mixtures, with a focus on hydrogen-doped liquid xenon. The techniques found through the construction and operation of Henry will ultimately inform the HydroX upgrade in LZ.