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

…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

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

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

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

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

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

Gas handling panel

0.75m3 Tank

PT Cryocooler

Test chamber

700W compressor

LXe Cryogenic system at KEK

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)

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

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