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Status of CJPL & CDEX
Wu Yucheng
Tsinghua University
On behalf of CDEX Collaboration
2012‐6‐13 NDM12 @ Nara
Outline:
CJPL• Introduction
• Status
• Future
CDEX• History
• Status
• Future
Summary
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CJPL – IntroductionBoulby
2800 m.w.e.ZEPLIN, DRIFT,
NaIAD
Canfranc2450 m.w.e.ANAIS, ArDM,
IGEX, ROSEBUD
LSM4800 m.w.e.EDELWEISS
Gran Sasso3500 m.w.e.
DAMA, CRESST, WARP, XENON, DARKSIDE
CJPL7000 m.w.e.CDEX‐TEXONO,
PANDA‐X
Y2L2100 m.w.e.
KIMS
Super‐K2700 m.w.e.
XMASS, NEWAGE
SULAH/DUSEL4500 m.w.e.LUX, LZD, Max, GEODM, COUPP
Soudan2100 m.w.e.CDMS, CoGeNT
SNOLAB6000 m.w.e.DEAP/CLEAN,
PICASSO, COUPP
South Pole2200 m.w.e.
DM‐Ice
CJPL – Introduction ‐ Site
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2400m
• Main Hall: 6.5m×6.5m×40m• Total Vol.: ~ 4000m3
China JinPing underground Laboratory
CJPL – Introduction ‐ Layout
Access TunnelPANDA-X
Low BkgFacility
ElectronicsCDEX
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6/26
Access TunnelPANDA-X
Low BkgFacility
ElectronicsCDEX
CJPL – Status
12
3
4
56
CJPL – Status ‐ Ventilation System (2011)
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1 2
3 4
Blower Room Blast Pipe
Air Shower Main Hall
8/26
CJPL – Status ‐ Experiments
Low Bkg Facility CDEX-1
PANDA-X
5
6
9/26
CJPL – Future
10/26
CDEX – History ‐ Collaboration with TEXONO & KIMS
2002
2012
2004
2006
2007
2009
2007
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CDEX – History ‐ China Dark matter Experiment
CDEX Target:Direct Search of Cold Dark Matterwith O(10 kg) Ge detectors of Sub‐keV Energy Sensitivity.
Goal: O(0.1cpkkd), < 300eV
DM
DM
SM
SM
New
Physics?
Production
Direct
Detection
IndirectDetection
China Dark‐matter EXperiment• 2009.03, CDEX founded;
• 2009.05, MOU between THU & EHDC;
• 2010.12, CJPL opening;
• 2011 to date, CDEX‐1 running…
• Tsinghua University• SiChuan University• Nankai University• China Institute of Atomic Energy• Ertan Hydropower Development Company
CDEX‐TEXONO Collaboration12/26
CDEX – Status ‐Membership
2 groups of 3‐fold coincident Plastic Scintillators.
• 28 Cosmic Ray Events within 178 days.
• CR flux is ~ 2×10‐10cm‐2s‐1, ~ 10‐8 of ground level.
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CDEX – Status ‐ Bkg Measurement : CR
Group A Group B
F.E. Gray, et al., NIMA638 (2011)
preliminary
Portable HPGe
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CDEX – Status ‐ Bkg Measurement : Gamma
CJPL Rock Bkg(Unit: Bq/kg)
K‐40(1461keV)
Ra‐226(609keV)
Th‐232(911keV)
CJPL Rock Sample < 1.1 1.8±0.2 < 0.27
Beijing Normal Ground Level ~600 ~25 ~50
preliminary
Home‐made 3He tube system:• Pure OFHC tube wall;
• Readouts form both ends;
• Φ 25.4mm × 1m.
15/26
CDEX – Status ‐ Bkg Measurement : Thermal n
~ 8 days data@ Main Hall
RATE Main Hall PE shielding
ROI (cpd) 34.11 3.71
α Bkg (cpd) 4.0 4.4Thermal n (cpd) ~ 30 < 1Thermal n flux
(cm‐2s‐1) 4.34×10-6 <1.45×10-7
Reach the sensitivity limit of the detector.
preliminary
• Gd‐loaded liquid scintillator• Quartz container (copper shell);
• 2 PMTs at both ends;
• Under testing…
16/26
CDEX – Status ‐ Bkg Measurement : Fast n
Ø30cm
40cm
• Coaxial HPGe;• Sheilding:
10cm PE;
15cm Pb;
5cm Cu;
N2 flushing inside.
• Select Low BkgMaterials.
17/26
CDEX – Status ‐ Low Bkg Facility
• 20g‐ULEGe array;(Ultra Low Energy Germanium)
• 1kg‐PPCGe;(P‐type Point‐Contact Germanium)
• CsI(Tl) crystal;(Cuboid array)
• NaI(Tl) crystal;(Well single)
CDEX – Status ‐ CDEX‐1: Detectors
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CDEX – Status ‐ CDEX‐1: Shielding System
• 20g‐ULEGe: Data taking and data analysis now!• 1kg‐PPCGe: Data taking!
1kg PCGe
4x5g ULEGe
20cm OFHC Copper+20cm Lead
CDEX – Status ‐ CDEX‐1: Data Taking
20/26
Simulation• Shielding: PE + Pb + Cu + SS + LAr;
• Detector: HPGe, LAr, PMT;
21/26
CDEX – Status ‐ CDEX‐10: Simulation
L
L
LL LAr
GAr
HV and Signals Cooling and Control
• LAr: Passive shielding + Active shielding.• Ge: Encapsulated into Al vacuum tube for cooling.
Three PCGe in one tube.• WLS: Transferring 128nm light to ~ 420nm light.
Prototype testing at present!
22/26
CDEX – Status ‐ CDEX‐10: Cryogenic System
23/26
CDEX – Status ‐ CDEX‐10: R&D on Electronics
• New CJPL Halls;
• 103 Crystal Array;
• LAr Cooling and Shielding;
• New Design of Shielding and Cryogenic System;
•…
24/26
CDEX – Future ‐ CDEX‐1T Prospects
CJPL• The deepest rock overburden Lab is running;
• New Ventilation System is blowing in fresh air.
CDEX• CR γ and n background is under measurement;
• First Low Background Facility has been testing;
• CDEX‐1: both 20g & 1kg HPGe are taking data;
• CDEX‐10: engineering design and prototype test.
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Summary
Thanks for your attention!
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