1. Chromatographic Separation of Krypton 85 From Xenon

2. Large Underground Xenon (LUX) Detector What is dark matter? Direct detection of Weakly Interacting Massive Particles (WIMPs) as the leading candidate for dark matter Radioactive backgrounds must be reduced to detect WIMPs

3. Large Underground Xenon (LUX) Detector 350 kg of Xenon must be purified Heated getter technology removes contaminants except noble gases Krypton 85: Present in the air in small amounts Present at ~5ppb in xenon Goal <5ppt in xenon

4. Krypton Removal system Carrier gas flows through the system (He) Adsorption charcoal column (right) Molecules attracted to the porous surface of adsorber Adsorption constants differ; xenon and krypton separate Existing charcoal column

5. Circulation system and Phases 1. Charge with Helium 2. Feed 3.Purge 4.Recovery 5. Condenser to Storage 6. Kr Trap to Transfer Trap T. Shutt 7/9/2009

7. Krypton Removal Phases

8. Krypton Scale Up Storage and Recovery Vessel (SRV) to be used at the main condenser Larger charcoal adsorber column, with changed geometry (right)

9. Questions?