China JinPing underground Laboratory (CJPL) and China Darkmatter Experiment (CDEX) Qian Yue Tsinghua University Mar.24, 2011
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1 China JinPing underground Laboratory (CJPL) and China Darkmatter Experiment (CDEX) Qian Yue Tsinghua University Mar.24, 2011
2 Outline Survey of Low background Experiment in China The recent status of CJPL The recent status and plan of CDEX Summary 2/52
3 Brief Survey of Low Background Experiment in China Double Beta Coal Mine in Beijing 1980s Dark Matter Search as a member of DAMA 1990s Reactor neutrino experiment of TEXONO 1997 Dark Matter Search of KIMS Collaboration 2000 DayaBay neutrino experiment 2004 DM search experiment with ULE-HPGe 2005 DM search with ultra-low energy threshold PCGe array detector by CDEX-TEXONO 2009 DM search with LXe detector by PandaX 2009 DM search experiments in China with LAr, Bubble Chamber, CaF 2 Eu/BaF 2,CCD, /52
4 International Main Undergound Laboratories Boulby ZEPLIN DRIFT CJPL CDEX PandaX SNO DEAP/CLEAN PICASSO Y2L KIMS Modane EDELWEISS GRAN SASSO DAMA/LIBRA CRESST WARP XENON Kamioka XMASS Soudan CDMS DUSEL LUX 4/52
5 CJPL site 5/52
6 Transport Tannel (two) Total seven tunnels: Drainage Tunnel (One) Headrace Tunnel (Four) A B 6/52
7 Yalong River and Jinping Mountain Tunnel 50min from Chengdu By Air 120km XiChang 7/52
8 Road and Tunnel 8/52
9 Logistic Condition of this UL 9/52
10 China JinPing Underground Laboratoy (CJPL) 2400m 8750m 10/52
11 Comparison of main ULs in the world (Unit:M.W.E) 2100m Y2L Korea 2450m Canfranc2700m Spain Kamioka Japan 2800m Boulby UK 3500m INO India Tunnel Mine 3500m LNGS Italy 4400m Baksan Russia Deep Underground Lab 4800m Modane France 4500m DUSEL USA 7000m 6000m SNO Canada ~7500m CJPL China 11/52
12 MOU between EHDC and THU Signed (MOE, SASAC, SDIC, NNFSC, THU, EHDC) 12/52
13 International Highlight: Science,Physics Today 13/52
14 CJPL Rock Background (UnitBq/kg) K-40 Ra-226 (609keV) Th-232 (911keV) JinPing Rock Sample < ±0.2 < 0.27 Beijing Normal Ground Level ~600 ~25 ~50 14/52
15 The Layout of CJPL-I Main Hall Access Tunnel Main hall: 6.5*6.5*40m Total Volume: ~4000m 3 15/52
16 Dig the tunnel for CJPL in July, /52
17 Aug., /52
18 Jan., /52
19 19/52
20 20/52
21 The Gate of CJPL in June /52
22 The main hall of CJPL in June /52
23 Dec. 12,2010 Openning Ceremony 23/52
24 Inside the CJPL 24/52
25 Internal space use CDEX Low background Facility PandaX 25/52
26 Measurements and studies of the performance of CJPL Muon flux measurement Gamma background measurement Neutron background measurement Radon level monitor Installation of Low background facility 26/52
27 Muon flux measurement Group A Group B The first possible Muon event: Date: 2010/12/02 Time: 04:49:19 Yucheng Wu s Talk! Group No.: B 27/52 10:06 27
28 Gamma Background Measurement and Installation of Low Background Facility Main Hall Gate Dr. Zhi Zeng s Talk! 28/52
29 Neutron background Measurement Fast neutron measurement with Gd-LS Dr. Jingjun Zhu s Talk! Thermal neutron measurement with He-3 tube Dr. Hui Gong s Talk! 29/52
30 Dark matter Experiment in China 30/52
31 Dark matter detection DM Indirect Detection SM New Physics? Direct Detection DM Production SM 31/52
32 Detector Techniques - Present Focus : Nuclear Vs Electron recoils CDEX-TEXONO, CoGeNT (HPGe) WIMP CDMS II, EDELWEISS I E ionization Background Signal Ionization 10% energy CDMS II, EDELWEISS II E phonons ZEPLIN II/III/Max, XENON, LUX, WARP, ArDM DAMA/LIBRA KIMS ZEPLIN-I, DEAP, CLEAN, XMASS Target Light 1% energy fastest no surface effects WIMP Phonons/heat CRESST II 100% energy slowest cryogenics E light Picasso, Simple, Coupp (superheated) Background Signal E phonons Future : Lower Threshold ; Direction Sensitive 32/52
33 Recent DM search results CRESSTAl 2 O 3 262g France Heat CDEX-TEXONOy2009 ULE-HPGe Detector Array China Ionization CoGeNTy2008 PCGe Detector USA Ionization DAMANaI Crystal~200kg Italy Light CDMSGe array 250g 7 y2009 USA Heat and Ionization XENON10: 10kg LXe USA Light and Ionization XENON100: 100kg LXe y2010 CoGeNTy /52
34 China Darkmatter EXperiment (CDEX) J. P. Cheng, K.J. Kang, J. Li, J.M. Li, Y.L. Li, Y.J. Li, H. Ma, N. Yi, Q. Yue, T. Xue, Z. Zeng (Tsinghua University, THU) K.X. Jing, C.J. Tang, Z.Y. Tang, H.Y. Xing, C. W. Yang, J.J. Zhu (Sichuan University, SCU) X.Q. Li, Y. Xu, C.X. Yu (Nankai Univeristy,NKU) H. X. Huang, X. Li, J. Ren, X.C. Ruan, Z.Y. Zhou (China Institute of Atomic Energy, CIAE) Y.H. Chen, B.M. Shen, J.M. Wang, S.Y. Wu, X.H. Zeng (Ertan Hydropower Development Company, EHDC) H.T. Wang (TEXONO Collaboration) 34/52
35 CDEX-TEXONO History July2003 Agreement between THU and SNU signed for DM search Experiment at Y2L, Korea 35/52
36 CDEX history August2004 published first paper for the detailed calculation and estimation of the possibility of low mass dark matter search with low energy threshold HPGe detector 36/52
37 CDEX history In 2009 TEXONO-CDEX published first Dark matter experiment physical results With 20g ULE-HPGe detector. 37/52
38 Detector CJPL Point-contact Ge array detector with ultra-low energy threshold (~300eV or less) OFHC Mass of Ge target: 5g, 20g, 1000g Anti- Compton Detector Ge Target Crystat 38/52
39 PE Shielding installation 39/52
40 40/52
41 41/52
42 42/52
43 20109 Neutron Shielding and Layout 10Kg scale and 1 Ton scale HPGe System PE shielding room 1Kg scale HPGe detector and Lead Shield 43/52
44 CDEX-TEXONO 1kg scale HPGe detector run! 20g HPGe test running now! 1000g PCGe detector in CJPL! Detectors produced by Canberra France! 44/52
45 10kg scale PCGe detector array with LAr active shielding HV and Signals Cooling and Control L L L G A r LA r L 45/52
46 CDEX-TEXONO 1T plan Allication of germanium detector in fundamental 46/52
47 CDEX TEXONO physics goal PRD(79)061101, /52
48 PCGe detector development Point-Contact detector development Li Yulan s Talk Low Noise Pre-AMP electronics development Deng Zhi s Talk And Zhu Weibin Talk 48/52
49 Quenching Effect measurement of Ge Ruan Xichao s Talk 49/52
50 Roadmap of CDEX TEXONO From 2000, learn the DM related knowledge and the status of DM search experiment. 2003, Choose own physics goal: Low mass dark matter search with PCGe detector. 2005, Start 1kg scale detector. 2011, 10kg scale detector. 2015, 1T scale PCGe array detector 50/52
51 Summary CJPL is OK in 2010 with deepest rock overburden. Low background facility has been planed to setup in CJPL. Muon flux, neutron flux, gamma background and radon concentration have been prepared to measure. CDEX-TEXONO Collaboration: PCGe detector: data taking from 2011 with 20g ULE- HPGe detector +1000g PCGe detector. Start to design 10kg-scale detector with Canberra France. CDEX-TEXONO Target: 1 ton PCGe array detector. PCGe also served as reactor neutrino detector for TEXONO-CDEX Collaboration at Taipei. Henry Wong s Talk 51/52
52 Summary We wish to exchange and share the updated Ge crystal growth and detector development experience with experts in Germany and in the World. Developing ton-scale Ge detector for DM and DBD is a long way to go. It will be benefit for us to collaborate in the future. CDEX-TEXONO wish to push the collaboration with GERDA and MPP. Thank you! 52/52
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