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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. CRYOGENIC OPERATION FOR LARGE-PROTO DETECTOR.
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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
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
CRYOGENIC OPERATION FOR LARGE-PROTO DETECTOR-Operation history- 2002.7.16 PSI
CRYOGENIC OPERATION FOR LARGE-PROTO DETECTOR-System flow diagram (without circulation purification)- Pulse tube refrigerator Xe bottle for 120L 2002.7.16 PSI
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
CRYOGENIC OPERATION FOR LARGE-PROTO DETECTOR-Typical operation mode for 120 L of LXe- *~15m long foam-insulated cooling pipe 2002.7.16 PSI
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
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%
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
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
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
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
PURIFICATION SHEME -Large Proto experience- 2002.7.16 PSI Effective purification method is found…
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
PURIFICATION SHEME 2002.7.15-17 PSI Meeting Possible circulating purification scheme…
2002.7.16 PSI DESIGN STUDY FOR FINAL CALORIMETER CRYOSTAT-General view- 1400mm 2800mm 1080i.d 2300o.d
2002.7.16 PSI DESIGN STUDY FOR FINAL CALORIMETER CRYOSTAT-Layout- Xe gas storage tanks LN2 dewars LXe detector Transporting solenid
DESIGN STUDY FOR FINAL CALORIMETER CRYOSTAT-Flow scheme- 2002.7.16 PSI
2002.7.16 PSI DESIGN STUDY FOR FINAL CALORIMETER CRYOSTAT-Operation scheme-
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
Gas for effective bake-out -large heat capacity -good thermal conductivity @300K, 0.1 MPa