1. COMPRES 2007 Annual Meeting COMPRES Gas Loading System at APS Progress Report June 2007 Mark Rivers

2. COMPRES 2007 Annual Meeting Outline  Design  Status  Costs  Future plans

3. COMPRES 2007 Annual Meeting Key system design goals  Based on COMPRES workshop at APS on April 28, 2006 attended by 16 people  Able to load many kinds of cells  Closure mechanism (motor driven screws) closes a clamping device, not the cell itself. Easy to add new cell designs, just a different clamp or different spacers Easy to add new cell designs, just a different clamp or different spacers  Optical access.  Vacuum pump to clean system before loading  No electrical parts except pressure transducers in high-pressure enclosure Allows flammable gas operation in future Allows flammable gas operation in future  Easy to safely operate

4. COMPRES 2007 Annual Meeting Key safety features  Started with approved LLNL design  Many new features to improve ease of use and interlocks for safe operation  Interlocked heavy-duty enclosure (3/8”” aluminum, ¾” plywood). All high-pressure components contained inside enclosure  All high-pressure components are supplied from vendors, pressure tested. No locally machined high-pressure components.  Gas loaded from lecture bottle to limit total mass (energy) that can be compressed in pressure vessel. Protects against user forgetting to load cell or filler parts. Protects against user forgetting to load cell or filler parts.  Pressure meters on both low and high pressure systems which will vent before rupture disk fails  Gas-operated valves and motor operated drives for remote operation  PLC for interlock control and computer for routine operations control

5. COMPRES 2007 Annual Meeting Interlocks  Prevent over-pressuring low-pressure side with lecture bottle Gauge 1 > 1700psi: Vent low pressure side Gauge 1 > 1700psi: Vent low pressure side Close V1, V4Close V1, V4 Open V2, V3Open V2, V3 Turn off compressorTurn off compressor  Prevent over-pressuring high-pressure side with pressure vessel Gauge 2 > 30000psi: Vent high pressure side Gauge 2 > 30000psi: Vent high pressure side Open V6Open V6 Turn off compressorTurn off compressor

6. COMPRES 2007 Annual Meeting Interlocks  Prevent pressurizing more gas than lecture bottle contents V1 open: Isolate compressor output V1 open: Isolate compressor output Close V5Close V5  Prevent adding a second lecture bottle contents to already pressurized vessel Gauge 2 > 1700 PSI: Gauge 2 > 1700 PSI: Close V1Close V1  System at desired maximum pressure Turn off compressor (holds pressure) Turn off compressor (holds pressure)

7. COMPRES 2007 Annual Meeting Routine Operation  Computer control will be used for routine operations such as: Pressurizing lecture bottle up to 1700psi Pressurizing lecture bottle up to 1700psi Pressurizing pressure vessel up to 30000psi Pressurizing pressure vessel up to 30000psi Venting high and low pressure systems Venting high and low pressure systems Pumping high and low pressure systems with vacuum pump Pumping high and low pressure systems with vacuum pump

8. COMPRES 2007 Annual Meeting Schematic

9. System Cabinet Compressor Vacuum pump Valves Pressure vessel Bottom plug, DAC, closure assembly

10. COMPRES 2007 Annual Meeting Cell Closure Vessel bottom plug Stepper motor Gear box Cell clamp (DAC inside)

11. COMPRES 2007 Annual Meeting Cell Closure Bottom plate with springs Cell holder Diamond anvil cell Top plate Guide posts Holes for motor-driven closing screws

12. COMPRES 2007 Annual Meeting Control Panel (temporary) Low Pressure GaugeHigh Pressure Gauge Programmable Logic Controller (PLC) Air valves High P valve

13. COMPRES 2007 Annual Meeting Control System Screen

14. COMPRES 2007 Annual Meeting Status (June 15, 2007)  All major components purchased  Control system finished  All components except pressure vessel tested to 2kbar.  Final assembly in progress.  Need final APS safety approval.  Plan to load a cell within 2-3 weeks  Will be located on experimental floor near 13- ID-D

15. COMPRES 2007 Annual Meeting To be done  New top plug with sapphire window (order placed)  Optical viewing system  Jack to lift bottom plug and motors  Test and refine cell closure mechanism

16. COMPRES 2007 Annual Meeting Costs Compressor$11K Pressure vessel $14K Valves, fittings $8K Vacuum pump $8K Cabinet$10K Pressure transducers and gauges, $3K PLC$2K Video system $3K Motor control $2K Computer control $2K Cell closure $1K Miscellaneous$6K TOTAL (excluding labor) $70K

17. COMPRES 2007 Annual Meeting Future  Duplicate system for use at other labs UNLV, ALS, NSLS UNLV, ALS, NSLS Who will do assembly? Who will do assembly? Who assumes liability? Who assumes liability?  COMPRES may use remaining funds from $118K allocated for this system to share costs of ALS and/or NSLS systems  Open to users soon!