first xenon liquefaction at nantes by using pulse tube cryocooler workshop fjppl’07, 9-12 may...
TRANSCRIPT
First Xenon Liquefaction at Nantes by using Pulse Tube Cryocooler
Workshop FJPPL’07, 9-12 May 2007, KEK, Japan
Tom Haruyama (KEK)
Eric Morteau, Patrick Le Ray, Cyril GrignonNoel Servagent, Jean-Pierre CussonneauDominique Thers(Nantes)
D_R&D_6 Liquid xenon detector technology
…following Dominique’s talk….
1. LXe PET cryogenic system at Nantes
2. Pulse Tube Cryocooler Development at KEK
3. First xenon liquefaction at Nantes
4. Application to other Liquid Xenon Experiments
5. Summary and plan for this year
Liquid xenon - any specialties in cryogenic?
Physical Property of Xe
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)/massLs(kJ/L): latent heat (solid)/volume
Triple point
164.782947
95.82821.23.5
161.36 K0.0815 MPa
77.24807
199.016128.422.9
63.148 K0.0125 MPa
…How to cool ?
Cooling method – Mechanical refrigerator-
Specially, Pulse Tube Cryocooler:
Advantages: -Just switch on! For… -Precise temperature and pressure control, -LN2-Free operation -Quiet, maintenance free for years’ operation
Cooling power requirement: -up to ~200W @165-170K Developed at KEK
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)
-Cooling power achieved ~70W @165K-Technology Transferred for upgrading to 200W
KEK-Iwatani PC150
First Xenon liquefaction at Nantes, March-April 2007
General set-up
LO
AD
ING
TA
NK
V1
V2 V3
Cryostat
Pump3
V15
V4
V5
RESCUE TANK
Area 1
Area 2
Area 4
0.4m
V8
REG1
N1
V7
T3
Pump1
M
Comp1
M
V1w
T6
T5
T1 T2
T4
T4 T2
T1 T5
ZA
ZA
P4 DR1
V3p
R5
PM2
P1
MESSER V2m
V5m
V6m
V8m
V9m
V7m
V10m
V3m
V4m
V1m V11m
V12m
Port 1
V1p
M Port 3
D1
SAES
V2s
V3s
B
A
A
B
VEP1
B1 R2
M
P2 V6
V9 V10
V11
V12
V13 P3
V2p Port 2
V14
Pump2
P5 Area 3
8m
1m
V1s
M1
T7
R3
R1
R4
V2w
N2
V2w
1.6 Bars Maxi
P2&P3 >1.4 Bars
PM1
MA
IN T
AN
K 2
V16
M2
N3
MA
IN T
AN
K 1
NRV1
V18
P6
V17
FP2
FP1
0.1 bar<P4<0.9bar
VEP2
Xenon gas main tank with LN2 vessel
Gas purification panel
Experimental chamber with a pulse tube cryocooler
Pulse tube cryocooler
Helium compressor
On-site計測パネル
LabVIEWパネル
Temperature profile during pre-cooling
Pressure profile during pre-cooling
Liquid xenon level profile6L Liquefaction
Steady state
1 day
Liquid xenon temperature and pressure profile (steady state)
Temperature profile
Pressure profile
Now, this PT cryocooler is ready for extended scientific experiments, MEG, XENON10,…
Final MEG LXe Calorimeter
•800 liter LXe detector with 850 PMTs•Total heat load: 130 W at 165 K
XENON10 Experiment for Dark Matter search
in Gran Sasso underground
Summary
First xenon liquefaction at Nantes by Pulse Tube Cryocooler: -2-day pre-cooling and 12 hours for 6 litters liquefaction -3-day steady operation without any instability
Confirmed cryogenic system performance:-Convenient (LN2-free Operation…)-Quiet-Stable
Cryogenic system is ready for LXe proto-chamber experiment: -next for the first chamber performance test in June
Great Contributions:-Eric Morteau (Electronics)-Patrick Le Ray (Mechanics)-Cyril Grignon (PhD student)-Noel Servagent (Xenon Cryogenics)-Jean-Pierre Cussonneau (Simulation)-Dominique Thers (Team Leader)
(Nantes)-Tom Haruyama (Xenon Cryogenics)
(KEK)
17:03 21 March 2007Successful ‘First Xenon Liquefaction’
at Nantes!
Evidence of successful collaboration