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

Published byLisa Cook Modified over 7 years ago

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Presentation on theme: "The Liquid Argon Test Facility in THU Qinghao Chen Tsinghua Univ. CDEX Tuebingen April 9, 2013 Development of High Purity Germanium."— Presentation transcript:

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

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

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

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

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

6 （ 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

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

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

9 The Liquid Nitrogen Cooling System Liquid Nitrogen LAr & GAr

10 LAr System

11 TPB evaporation system Teflon Teflon cylinder

12 TPB evaporation system TPB

13 TPB evaporation system PMT Teflon

14 TPB Coating Small glass pieces

15 TPB Coating Small glass pieces

16 System Installation

17

18 Plastic scintillator ： to tag cosmic rays

19 System Installation

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

21 The Pulse Shape in GAr  快慢成分较为明显！

22 The Pulse Shape before/after Purified

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

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

25 THANK YOU!!!

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