Speaker
Description
LUX-ZEPLIN is dark matter direct detection experiment which will take data a mile underground in Lead, South Dakota starting in 2020. Krypton backgrounds must be minimized to decrease backgrounds to an acceptable level. Special cylinders fitted with purge volumes around the neck of the cylinders will be constructed to store the xenon. The cylinders have an upper limit of 15 parts-per-quadrillion $g_{Kr}/g_{Xe}$ when filled and a maximum ingress rate of 6 ppq/year $g_{Kr}/g_{Xe}$ while in storage. Characterization of the prototype 80-kg cylinder, Cylinder ID LZ-R3d-CYL-01, concluded that LZ will meet the maximum ingress rate using LN boil-off as a purge gas for the fitted N\textsubscript{2} purge volume. We show that we can achieve a rise in krypton concentration of $4.08\pm 0.20$ ppq/year while the volume around the neck of the prototype LZC is purged with LN boil-off.
