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LXe PHOTON DETECTOR - CRYOGENICS

Explore the 2002 PSI meetings on LXe detector cryogenics, pulse tube refrigerator development, and effective purification methods for improved operation. Learn about the design study for final calorimeter cryostats.

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LXe PHOTON DETECTOR - CRYOGENICS

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  1. LXe PHOTON DETECTOR - CRYOGENICS KEK Tom HARUYAMA Cryogenic operation of 120 L large-proto detector Pulse tube refrigerator development Purification scheme Final photon detector system LXe is heavier than Aluminum! 2002.7.16 PSI

  2. CRYOGENIC OPERATION FOR LARGE-PROTO DETECTOR -LXe 120 L -PMT 250 -First operation--March, 2001 -8 runs up to now -Refrigeration only mode -Safety operation 2002.7.16 PSI

  3. CRYOGENIC OPERATION FOR LARGE-PROTO DETECTOR-Operation history- 2002.7.16 PSI

  4. CRYOGENIC OPERATION FOR LARGE-PROTO DETECTOR-System flow diagram (without circulation purification)- Pulse tube refrigerator Xe bottle for 120L 2002.7.16 PSI

  5. CRYOGENIC OPERATION FOR LARGE-PROTO DETECTOR-Operation Overview- Precool Liquefy Recovery Warm-up Steady Temperature(PMT holder top&bottom) Inside pressure Xe flow rate LXe level 2002.7.15-17 PSI Meeting

  6. CRYOGENIC OPERATION FOR LARGE-PROTO DETECTOR-Typical operation mode for 120 L of LXe- *~15m long foam-insulated cooling pipe 2002.7.16 PSI

  7. CRYOGENIC OPERATION FOR LARGE-PROTO DETECTOR-Heat Load- *Static heat load depends on manufacturers design *PMT power dissipation 65mW/PMT *Due to number and length of cables 2002.7.16 PSI

  8. PULSE TUBE REFRIGERATOR DEVELOPMENT-KEK in-house pulse tube refrigerator- 2002.7.16 PSI Features of pulse tube refrigerator -No vibration -Effective direct re-condensing -Possibly long life -Easy maintenance -Eco-friendly Achieved Cooling Power -70 W @165K -2.2 kW compressor -2.2 Hz operation -Coefficient Of Performance ~3%

  9. 2002.7.16 PSI PULSE TUBE REFRIGERATOR DEVELOPMENT-Stable temperature control - Temperature 0.5K Inside pressure 2kPa -Very quiet environment is achieved! -No ON-OFF, no excess cooling

  10. PULSE TUBE REFRIGERATOR DEVELOPMENT-KEK in-house coaxial pulse tube refrigerator- 2002.7.16 PSI Heat Load for Final Detector Cooling power @4.8kW comp. Design point for L.P Cooling power @2.2kW compressor

  11. PULSE TUBE REFRIGERATOR DEVELOPMENT-KEK in-house U-shape pulse tube refrigerator- 2002.7.16 PSI Cold head Regenerator 1000 SUS mesh inside Pulse tube 41mm f -U-shape:expected higher cooling power

  12. PULSE TUBE REFRIGERATOR DEVELOPMENT-KEK in-house U-shape pulse tube refrigerator- 2002.7.16 PSI Coaxial type @2.2kW U-shape type @1.6kW -COP~3% -Remaking regenerator better performance

  13. PURIFICATION SHEME -Large Proto experience- 2002.7.16 PSI Effective purification method is found…

  14. PURIFICATION SHEME 2002.7.16 PSI →good result, but… Additional Heat Load -5L/min Xe gas(300K) → 50-60W@165K -25L/min →250-300W@165K! -Heavy load for refrigerator -LN consumption increase~10-40L/hour ↓ Can be solved by:Cold heat exchanger

  15. PURIFICATION SHEME 2002.7.15-17 PSI Meeting Possible circulating purification scheme…

  16. 2002.7.16 PSI DESIGN STUDY FOR FINAL CALORIMETER CRYOSTAT-General view- 1400mm 2800mm 1080i.d 2300o.d

  17. 2002.7.16 PSI DESIGN STUDY FOR FINAL CALORIMETER CRYOSTAT-Layout- Xe gas storage tanks LN2 dewars LXe detector Transporting solenid

  18. DESIGN STUDY FOR FINAL CALORIMETER CRYOSTAT-Flow scheme- 2002.7.16 PSI

  19. 2002.7.16 PSI DESIGN STUDY FOR FINAL CALORIMETER CRYOSTAT-Operation scheme-

  20. 2002.7.16 PSI SUMMARY of photon detector cryogenics Cryogenic operation mode is understood through large-proto detector experiments Pulse tube refrigerator development is on-going for the final detector Effective purification scheme can be established Final photon detector is now under detailed designing

  21. Design study for final calorimeter cryostat

  22. Gas for effective bake-out -large heat capacity -good thermal conductivity @300K, 0.1 MPa

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