1. U N C L A S S I F I E D Progress Report on the Dual-Use Cryostat John C. Ramsey Los Alamos National Laboratory

2. U N C L A S S I F I E D 2 Dual-Use Cryostat Introduction Dress rehearsal for the nEDM upper cryostat Test-bed for various features Provides a home for R&D work for the He3 Injection system and the High Voltage system

3. U N C L A S S I F I E D 3 Vacuum Chamber Assembly Status Vacuum chamber test assembly in progress Pump-down and leak check this week or early next week

4. U N C L A S S I F I E D 4 Radiation Shield Assembly Split at two locations to facilitate assembly and modification inside the cryostat Top flanges also split 45° adapters can be installed after vacuum can All components have arrived

5. U N C L A S S I F I E D 5 High Voltage System Modifications High voltage insert design nearing completion System currently open and undergoing disassembly Completed design for 4K shield addition, off to shops early next week New cradle allows HV system to be easily moved and lifted into position under cryostat Adding cooling lines for shields and central volume Connections to the upper cryostat to be made from the bottom without disturbing the upper cryostat

6. U N C L A S S I F I E D 6 Cryostat Support Stand Simple support stand will arrive at LANL in a few weeks Makes use of small crane to overcome hook height problems in the building Auxiliary stands for the crane and atomic beam source forthcoming

7. U N C L A S S I F I E D 7 Coming Soon! Completion of test assembly / pump-down / leak check Modification of DR impedance Assembly of cryostat on support platform Commissioning and debugging runs A little finger-crossing, some late nights, and some R&D!