Qinghao Chen Tsinghua Univ CDEX c ollaboration Universitaet Tuebingen April 9 2013 Development of High Purity Germanium Detector Techniques for Applications in Fundamental Research ID: 726388
Download Presentation The PPT/PDF document "The Liquid Argon Test Facility in THU" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
The Liquid Argon Test Facility in THU
Qinghao ChenTsinghua Univ.CDEX collaboration@Universitaet TuebingenApril 9, 2013
Development of High Purity Germanium Detector Techniques
for Applications in Fundamental
ResearchSlide2
Outline
Liquid Argon Detector in CDEX
1
Liquid Argon Test Facility
2
Preliminary experimental results
3
Future Work
4Slide3
ton-scale
LAr as anti-Compton detector of ULE HPGe array in WIMPs direct detection @ CJPL
CDEX
CDEX
（
China Dark matter
EXperiment
）Slide4
The function of liquid argon
Keep
Ge
in a low temperature
Anti-Compton
Passive shieldingSlide5
Advantages of LAr Detector
Good stopping powerHigh scintillation yield (40000photons/MeV)Excellent particle identification capabilitytransparent to their own scintillation lightSlide6
（
1）Excitation -> decay（2）Ionization -> neutralized by thermalized electrons -> decaythree nearly degenerate spin statesFast component: 4ns
~
7ns
Slow component:
1100ns
~ 1600ns
6
scintillation
light of
ArSlide7
What’s more
Purification of ArThe detection of EUV photonsWavelength shifter(WLS):TPB(tetraphenyl butadiene)Slide8
Outline
Liquid Argon Detector in CDEX
1
Liquid Argon Test Facility
2
Preliminary experimental results
3
Future
Work
4Slide9
The Liquid Nitrogen Cooling System
Liquid NitrogenLAr & GArSlide10
LAr SystemSlide11
TPB evaporation system
TeflonTeflon cylinderSlide12
TPB evaporation system
TPBSlide13
TPB evaporation system
PMT
TeflonSlide14
TPB Coating
Small glass piecesSlide15
TPB Coating
Small glass piecesSlide16
System InstallationSlide17
System InstallationSlide18
System Installation
Plastic scintillator ：to tag cosmic raysSlide19
System InstallationSlide20
Outline
Liquid Argon Detector in CDEX
1
Liquid Argon Test Facility
2
Preliminary experimental results
3
Future
Work
4Slide21
The Pulse Shape in GAr
快慢成分较为明显！Slide22
The Pulse Shape before/after PurifiedSlide23
Outline
Liquid Argon Detector in CDEX
1
Liquid Argon Test Facility
2
Preliminary experimental results
3
Future
Work
4Slide24
Future Work
Get the pulse shapes in:Unpurified GArPurified GArUnpurified LArPurified LArSlide25
THANK YOU!!!