The Liquid Argon Test Facility in THU Qinghao Chen Tsinghua Univ. CDEX Tuebingen April 9, 2013 Development of High Purity Germanium.

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Presentation transcript:

The Liquid Argon Test Facility in THU Qinghao Chen Tsinghua Univ. CDEX Tuebingen April 9, 2013 Development of High Purity Germanium Detector Techniques for Applications in Fundamental Research

Outline Liquid Argon Detector in CDEX 1 Liquid Argon Test Facility 2 Preliminary experimental results 3 Future Work 4

ton-scale LAr as anti-Compton detector of ULE HPGe array in WIMPs direct CJPL CDEX CDEX （ China Dark matter EXperiment ）

The function of liquid argon  Keep Ge in a low temperature  Anti-Compton  Passive shielding

Advantages of LAr Detector  Good stopping power  High scintillation yield (40000photons/MeV)  Excellent particle identification capability  transparent to their own scintillation light

（ 1 ） Excitation -> decay （ 2 ） Ionization -> neutralized by thermalized electrons -> decay three nearly degenerate spin states Fast component: 4ns ~ 7ns Slow component: 1100ns ~ 1600ns 6 scintillation light of Ar

What’s more  Purification of Ar  The detection of EUV photons  Wavelength shifter(WLS):TPB(tetraphenyl butadiene)

Outline Liquid Argon Detector in CDEX 1 Liquid Argon Test Facility 2 Preliminary experimental results 3 Future Work 4

The Liquid Nitrogen Cooling System Liquid Nitrogen LAr & GAr

LAr System

TPB evaporation system Teflon Teflon cylinder

TPB evaporation system TPB

TPB evaporation system PMT Teflon

TPB Coating Small glass pieces

TPB Coating Small glass pieces

System Installation

Plastic scintillator ： to tag cosmic rays

System Installation

Outline Liquid Argon Detector in CDEX 1 Liquid Argon Test Facility 2 Preliminary experimental results 3 Future Work 4

The Pulse Shape in GAr  快慢成分较为明显！

The Pulse Shape before/after Purified

Outline Liquid Argon Detector in CDEX 1 Liquid Argon Test Facility 2 Preliminary experimental results 3 Future Work 4

 Get the pulse shapes in:  Unpurified GAr  Purified GAr  Unpurified LAr  Purified LAr

THANK YOU!!!