1. Luke or MTS Q anode

2. MOBY DICK  Purpose of Moby Dick:  Can we even get to ~10 ppb O 2 and H 2 O?  What other things in Moby will cause loss of LAr purity? Eye Spout TailMOBY DICK Modeled By LNG Tank (Will be detector structure)

3.  Argon Piston  Exchange a few Volumes  Recirculate and Filter to <10 ppb  Take purified gas and add to Luke  Hopefully do not lose PrM signal!! The Cleaning Process Inlet Outlet Argon Gas Ambient Air O 2 & H 2 O Filters Argon Cleaner Argon

4. Internal O 2 meters Relay rack for instrumentation. Argon supply. Baseline of 1 ppm O2, 1-2 ppm N2, and 2 ppm H2O. Various power Supplies DAQ The Plan And It’s Implementation

5. To argon dewar. Allows to test dewar gas. To AO2 and hygrometer To N2 meter. To DF-310. To DF-560. Allows to test filtered gas. Oxisorb filter. Inlet to MD.Outlet for recirculation. Bellows pump for recirculation. Mass Flow Controller Outlet from top of MD. Some Details

6. Fan power. Intake for recirculation. Fans to emulate perfect mixing. Argon inlet. Note diffuser. Moby Dick – Internal View

7. Hygrometer AO2 Cell DF-560 oxygen analyzer. 0-20 ppm range. DF-310 oxygen analyzer. 0-5000 ppm range. Main Instrumentation

8. The Results

9. More Results

10. Summary of Work  Oxygen  Concentrations can be quickly reduced through purging and/or recirculation.  Sticks to walls; estimated time constant of 140 hours. Limiting factor in obtaining UHP.  Water  Some confusion.  Sticks to walls; estimated time constant of 100 hours.  Nitrogen  Experimental N2 meter is still experimental.  Some progress was made, however. Realized that water content in sample gas affects arc.  Close to getting usable data.  Mention transfer to Luke.