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Progress on liquid xenon cryogenic system using pulse tube cryocooler at KEK
FJPPL’08, 15-16 May 2007, Paris, France
Tom Haruyama (KEK)
Alain Mery, Eric Morteau, Patrick Le Ray Cyril Grignon, Noel Servagent Jean-Pierre CussonneauDominique Thers(Subatech, Nantes)
D_R&D_6 Liquid xenon detector technology
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…following Alain’s talk….
1. Xenon properties
2. Pulse Tube Cryocooler Development at KEK
3. LXe cryogenic system launched at KEK
4. Summary and plan for this year
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Property LXe (saturated)
LN2 (saturated)
T(K): temperature at 0.1 MPa(kg/m3): density at 0.1 MPa
lv(kJ/kg): latent heat (liquid)/massLv(kJ/L): latent heat (liquid)/volumels(kJ/kg): latent heat (solid)/mass
Triple point
Concentration in air
164.782947
95.828217.5
161.36 K0.0815 MPa
0.09 ppm
77.24807
199.016128.4
63.148 K0.0125 MPa
--
Liquid xenon - any specialties in cryogenic?
-From Tc to Triple point --> 3K-Low latent heat to solid --> precise temperature control=> Pulse Tube Cryocooler
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KEK-developed High-Power Pulse tube Cryocooler
Cool i ng power (PC150)
0
50
100
150
200
50 100 150 200
Col d end temperature(K)
Cooling power (W)
Qi wa(W)Qpsi (W)
KEK-Iwatani PC150
Advantages: -Just switch on! For… -Precise temperature and pressure control, -LN2-Free operation -Quiet, maintenance free for years’ operation
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PSI (MEG)
NANTES (PET) CERN
GRAN SASSO (XENON)
COLUMBIA Univ.
KEK,KAMIOKA (XMASS)
PC150 Pulse Tube Cryocoolers on LXe projects so on, as of May 2008
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LXe cryogenic system launched at KEKLXe cryogenic system launched at KEK
-for LXe detector development -for basic research on LXe -for study on real application to PET
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LXe cryogenic system at KEK
Xe cylinder99.999%XeH2O, O2<0.1ppm
RecoveryBottle(3.75L)
SAES GetterMonotor
0.75m3
Tank
Circulation Pump(max:20L/min)P
P
Pm
TPC
PTC
Heatexchanger
Inner volume ~4L
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Gas handling panel
0.75m3 Tank
PT Cryocooler
Test chamber
700W compressor
LXe Cryogenic system at KEK
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Cooling test of miniature PT Cryocooler
-PTR PDC08( 8W at 77K: Iwatani) -Air cooled compressor (700W at 50Hz) -20W at 147K confirmed →24W at 165K
Cooling Power PDC080 08/ 04/ 30
0
5
10
15
20
25
0 50 100 150 200
Temperature (K)
Heate
r in
put
(W)
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Cooling, Liquefaction, Pump circulation test
Liq., Pump test 080507
- 120
- 100
- 80
- 60
- 40
- 20
0
20
40
60
0 400 800 1200 1600
Time elapsed (8hours f.s)
T(C
)
PT100
50mm
50mm
10mm
Foil heater
Results: - 5 hrs for pre-cooling by PT cryocooler only - 0.16L/h liquefaction speed - 2 L/min of pump circulation for purification
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Collaboration research: - Study on pre-cooling performance - Vibration reduction of PT Cryocooler at Nantes - Circulation purification of Xe gas
Cryogenic system for LXe experiments at KEK: - For basic investigation of LXe properties - Verify LXe purification technique - Technology to handle a large amount of LXe in future
Summary and plan for this year