Status of the EDELWEISS Dark Matter search
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1 Status of the EDELWEISS Dark Matter search KIT Institute Centre for Particle Nuclear and Physics Astroparticle Physics KIT University of the State of Baden-Wuerttemberg and National Research Center of the Helmholtz Association
2 Modane Underground Lab spokesperson: J. Gascon (IPNL) CEA Saclay (IRFU&IRAMIS) Paris-Orsay (CSNSM) IPNL Lyon Inst. Néel Grenoble KIT(IKP, EKP & IPE) JINR Dubna Oxford Univ. Sheffield Univ. Muon intensity, m -2 sr -1 y -1 5µ/m 2 /d (4800mwe) Modane 2 July 23, 2012 Klaus Eitel The EDELWEISS dark matter search
3 EDELWEISS-II experimental setup geometry as implemented in G4 MC cryogenic bolometer array 20 cm Pb shield (innermost 2 cm ancient Pb) 50 cm polyethylene 100 m 2 µ veto (48 plastic scint. modules) 1ton Gd-loaded liquid scint. for µ-induced Gd(n,g) not shown: Rn detector (~ mbq/m 3 ) 3 He n detector (~10-9 n therm /cm 2 /s) 3 July 23, 2012 Klaus Eitel The EDELWEISS dark matter search
4 EDELWEISS-II experimental setup 4 July 23, 2012 Klaus Eitel The EDELWEISS dark matter search
5 EDELWEISS-II detector technology Germanium bolometers Heat measurement (NTD sensor) E recoil E h (after NL correct.) Ionization few V/cm discrimination between ER and NR Q = ionization/recoil energy Q(NR) ~ 1/3 Q(ER) 1 st generation GeNTD 320g all planar electrodes 2 nd generation ID400 * ID400g 5 July 23, 2012 Klaus Eitel The EDELWEISS dark matter search *measured via cosmogenic g lines
6 calibration with g/n-cources g calibrations with 133 Ba n calibrations with AmBe more than g s g suppression factor 3x NR for every 30k g s (20-200keV) 90% CL signal region Q = 0.16 E r 0.18 from <10 to 200keV (detection efficiency below 20keV) P. Di Stefano et al., ApP14 (2001) 329 O. Martineau et al., NIMA 530 (2004) 426 A. Broniatowski et al., PLB 681 (2009) July 23, 2012 Klaus Eitel The EDELWEISS dark matter search
7 EDW-II final result ( ) total exposure of 427kg.d 384kg.d in 90% NR band (WIMP RoI) fiducial mass 1.6kg 5 events observed (4 with E<22.5keV; 1 with E=172keV) 3 evts bg expected 20<E<100 kev no indication for a WIMP signal PLB702,5 (2011) 329 standard halo σ SI < 4.4 x 10-8 pb at 90%C.L. for M WIMP = 85 GeV/c 2 7 July 23, 2012 Klaus Eitel The EDELWEISS dark matter search
![EDW-II results in s c vs. m c EDW (384kgd; [20-200keV], 5evts σ SI < 4.4 x 10-8 pb; M WIMP = 85 GeV/c 2 ) EDW-I EDW-II x20 improvement EDW-II 384 kgd E. Armengaud et al.](/docs-images/72/66903500/images/8-3.jpg ", PLB 702,5 (2011) 329 DAMA/LIBRA EPJ C56 (2008) CoGeNT PRL 106 (2011) CRESST II 2s arxiv:1109.0702 CRESST II 1s arxiv:1109.")
8 EDW-II results in s c vs. m c EDW (384kgd; [20-200keV], 5evts σ SI < 4.4 x 10-8 pb; M WIMP = 85 GeV/c 2 ) EDW-I EDW-II x20 improvement EDW-II 384 kgd E. Armengaud et al., PLB 702,5 (2011) 329 DAMA/LIBRA EPJ C56 (2008) CoGeNT PRL 106 (2011) CRESST II 2s arxiv: CRESST II 1s arxiv: Buchmüller et al, 2011 Bertone et al, July 23, 2012 Klaus Eitel The EDELWEISS dark matter search
9 EDW-II & CDMS comb. in s c vs. m c EDW (384kgd; [20-200keV], 5evts σ SI < 4.4 x 10-8 pb; M WIMP = 85 GeV/c 2 ) CDMS (~379kgd; [~10-100keV], 4 evts; σ SI <3.8 x 10-8 pb; M WIMP = 70 GeV/c 2 ) EDW + CDMS, combined analysis Phys Rev D 84 (2011) DAMA/LIBRA EPJ C56 (2008) CoGeNT PRL 106 (2011) CRESST II 2s arxiv: CRESST II 1s arxiv: CDMS Science 327, 1619 (2010) EDW-II PLB 702,5 (2011) 329 Buchmüller et al, 2011 Bertone et al, July 23, 2012 Klaus Eitel The EDELWEISS dark matter search
10 EDELWEISS-II low-e investigation arxiv: v1 m(c)=10gev ID det s sensitive to NR s down to 5 kev new independent analysis < 20 kev selection of data set : keep 4 det s with sub-kev resolutions remove noisy periods χ 2 based cut fiducial cut on ionisation signal high trigger low energy : 78 5 kev, kev best energy estimator for NR s at low energy : define "WIMP box" for each m c 10 July 23, 2012 Klaus Eitel The EDELWEISS dark matter search
![EDW-II low mass results in s c vs. m c EDW (384kgd; [20-200keV], 5evts σ SI < 4.4 x 10-8 pb; M WIMP = 85 GeV/c 2 ) 113 kgd; [5-20keV], 1-3 evts σ SI < 1.](/docs-images/72/66903500/images/11-2.jpg "0 x 10-5 pb; M WIMP = 10 GeV/c 2 ) EDW-II PLB 702,5 (2011) 329 + arxiv:1207.1815 EDW-II & CDMS PRD84 (2011) DAMA/LIBRA EPJ C56 (2008) CoGeNT PRL 106 (2011) CRESST II 2s arxiv:1109.")
11 EDW-II low mass results in s c vs. m c EDW (384kgd; [20-200keV], 5evts σ SI < 4.4 x 10-8 pb; M WIMP = 85 GeV/c 2 ) 113 kgd; [5-20keV], 1-3 evts σ SI < 1.0 x 10-5 pb; M WIMP = 10 GeV/c 2 ) EDW-II PLB 702,5 (2011) arxiv: EDW-II & CDMS PRD84 (2011) DAMA/LIBRA EPJ C56 (2008) CoGeNT PRL 106 (2011) CRESST II 2s arxiv: CRESST II 1s arxiv: CDMS Science 327, 1619 (2010) + Low E, PRL 106 (2011) XENON100 PRL 107 (2011) Buchmüller et al, 2011 Bertone et al, July 23, 2012 Klaus Eitel The EDELWEISS dark matter search
12 EDW-II low mass results in s c vs. m c EDW (384kgd; [20-200keV], 5evts σ SI < 4.4 x 10-8 pb; M WIMP = 85 GeV/c 2 ) 113 kgd; [5-20keV], 1-3 evts σ SI < 1.0 x 10-5 pb; M WIMP = 10 GeV/c 2 ) 12 July 23, 2012 Klaus Eitel The EDELWEISS dark matter search EDW-II PLB 702,5 (2011) arxiv: EDW-II & CDMS PRD84 (2011) DAMA/LIBRA EPJ C56 (2008) CoGeNT PRL 106 (2011) CRESST II 2s arxiv: CRESST II 1s arxiv: CDMS Science 327, 1619 (2010) + Low E, PRL 106 (2011) XENON100 PRL 107 (2011) XENON days 34kg Buchmüller et al, 2011 Bertone et al, 2011
13 EDW-III: next generation of detectors 2. generation ID detectors with lateral planar electrodes 400g cylindrical ID detector 6 NR evts in gamma calib evts 13 July 23, 2012 Klaus Eitel The EDELWEISS dark matter search
14 ionization yield 3. generation: FID detectors with rings on all surfaces NTD1 A B A B A B A B A B A B NTD2 EDW-III: next generation of detectors 75% fiducial C D C D C D C D C D C D A B A B D C D C g-calibration with 133 Ba (411663g s) preliminary 800g total mass ~600g fid. mass no NR evts in > g calib evts 14 July 23, 2012 Klaus Eitel The EDELWEISS dark matter search recoil energy (kev)
15 EDELWEISS-III (2012 upgrade) major upgrade of internal cryostat new arrangement of Ge bolometers new Cu mounting & thermal shields g bgd new internal PE 1K n bgd increase target mass 40 detectors à 800g 2 NTD, 4 (6) electrodes [2 «fiducial» volumes] 218 ultrasonic bondings per detector Background ( kev) EDW-2 (evt / kg.d) EDW-3 (evt / kg.d) gamma rate ambient neutrons ( ) 10-3 mainly due to cables and connectors ( ) July 23, 2012 Klaus Eitel The EDELWEISS dark matter search
16 EDELWEISS-III (2012 upgrade) upgrade of electronics & cabling 100K 300K 1K Optical In/Out BBv1 or BBv2 Digital Board + fast readout board mezzanine DC-DC converters Analog board: 6 Low noise voltage amplifiers & DAC board new cables 300K-100K-1K-10mK FET boxes AD boxes w/ 100kHz/40MHz sampling new front-end electronics <1 kev FWHM baseline resolution upgrade of DAQ & data structure EDELWEISS PLB 681 (2009) >240 ch s in 1 crate; fast trigger for ionisaton A. Cox et al., NIM A684 (2012) 16 July 23, 2012 Klaus Eitel The EDELWEISS dark matter search
17 Events / day EDW investigations on µ-induced neutrons µ veto.and. bolometers 1504 kg.d Gd-loaded scint. Neutron counter µ veto.and. Gd(n,g) AstropartPhys 34 (2010) 97 before vetoing Background ( kev) EDW-2 (evt / kg.d) EDW-3 (evt / kg.d) gamma rate GEANT4 (no scaling!) Measured excess (793 live days, 272 hits) ambient n s ( ) 10-3 ( ) 10-4 µ-induced n s < < # of secondaries within T DAQ 17 July 23, 2012 Klaus Eitel The EDELWEISS dark matter search
18 EDELWEISS-III goal for 2013 <1 evt total background estimated for 3000kg.d eff. exposure EDW-II PLB 702,5 (2011) arxiv: EDW-III 24kg(fid) 6 months DAMA/LIBRA EPJ C56 (2008) CoGeNT PRL 106 (2011) CRESST II 2s arxiv: CRESST II 1s arxiv: CDMS Science 327, 1619 (2010) + Low E, PRL 106 (2011) EDW-3 projected 3000 kg.d 24kg fid. mass x 125days XENON100 PRL 107 (2011) XENON days 34kg Buchmüller et al, 2011 Bertone et al, July 23, 2012 Klaus Eitel The EDELWEISS dark matter search
19 beyond EDELWEISS-III: EURECA EURECA goal: pb, 150kg 1000kg, multi-target, bgd ~ 10-3 evts/(kg.y) EDW, CRESST, ROSEBUD, + others coordinated cooperation with SuperCDMS (1 st joint meeting Oct 7, 2011) CDR in summer 2012 facility type (DM, 0nbb,...) part of European ASPERA roadmap cryostat in water Cerenkov detector towers multi-target det s 19 July 23, 2012 Klaus Eitel The EDELWEISS dark matter search
20 Conclusions EDW-I EDW-II factor 20 improvement EDW-II: 10 ID Ge bolometers m det = 400g; m fid = 160g 1.6kg fid keV: 5 evts, 5.1 bgd (dominated by ambient n s) 5-20keV: 1-3 evts, <3 bgd (1.7 n s g s) EDW-III: 40 FID Ge bolometers m det = 800g; m fid = 600g 24kg fid upgrade of inner cryostat, new internal shield upgrade of cabling and electronics reduction of bgd (gammas: 2-6; neutrons >10) EDW-III 3000kgd fid exposure in 6 months (no bgd expected) EDW-III detector technology ready for 1-ton cryogenic array 20 July 23, 2012 Klaus Eitel The EDELWEISS dark matter search
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