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LXe Refrigeration/Purification STATUS

Developments in pulse tube refrigeration systems and liquid purification schemes, including COP optimization and purification schemes. Collaboration meetings discussed improvements for cryostats. Effective liquid purification concept outlined for final calorimeter system.

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LXe Refrigeration/Purification STATUS

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  1. LXe Refrigeration/Purification STATUS KEK Tom HARUYAMA Pulse tube refrigerator Liquid phase purification 2003.2.3 PSI Collaboration Meeting

  2. 1.PULSE TUBE REFRIGERATOR-Heat Load- 2003.2.3 PSI Collaboration Meeting

  3. 1.PULSE TUBE REFRIGERATOR-KEK in-house coaxial pulse tube refrigerator- 70 W @165K 2.2 kW compressor 2.2 Hz operation COP ~3% 2002.2.3 PSI Meeting

  4. 2003.2.3 PSI Collaboration Meeting 1.PULSE TUBE REFRIGERATOR-Cooling power at 2.2/4.8kW compressor-

  5. PULSE TUBE REFRIGERATOR DEVELOPMENT-KEK in-house U-shape pulse tube refrigerator-

  6. PULSE TUBE REFRIGERATOR DEVELOPMENT-KEK in-house U-shape pulse tube refrigerator- -COP~3% -R&D is going on for better performance

  7. 2003.2.3 PSI Collaboration Meeting 1.PULSE TUBE REFRIGERATOR -Cooling power vs compressor input power-

  8. PULSE TUBE REFRIGERATOR -6.5kW compressor- 2003.2.3 PSI Collaboration Meeting

  9. PULSE TUBE REFRIGERATOR DEVELOPMENT-For final calorimeter- 1. Coaxial -Highly reliable by LP experience -Enough cooling power 2. U-shape -Not too much improvement -Still under R&D for large power -Fabricate two coaxial pulse tube refrigerator -One for main cryostat, one for spare or for storage dewar

  10. 2003.2.3 PSI Collaboration Meeting 2.PURIFICATION SCHEME -Present gas purification- -10L/min diaphragm pump -1.2L/h LXe →100hours for 120L circulation

  11. 2.PURIFICATION SCHEME -Liquid pump- Commercially available -Barber-Nichols Inc. centrifugal pump -100L/h, ~0.1Mpa -applied to 9000L Kr calorimeter at CERN (1000L/h, 0.2MPa) 2. Hand made pump in Japan under R&D -centrifugal pump -using immersible DC motor (contamination?) - 10-50L/h, ~0.1MPa 2003.2.3 PSI Collaboration Meeting

  12. 2003.2.3 PSI Collaboration Meeting 2.PURIFICATION SCHEME -For liquid purification concept-

  13. SUMMARY 2003.2.3 PSI Collaboration Meeting Pulse tube refrigerator fabrication for the final calorimeter system will be stared soon Effective liquid purification scheme will be established

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