Present and Future Cryogenic Dark Matter Search in Europe

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ryogenic are vent earch with uperconducting hermometers. C R E S S T. Present and Future Cryogenic Dark Matter Search in Europe. EURECA. EURECA. Wolfgang Rau, Technische Universität München. CRESST Max-Planck-Institut for physics (Munich) Technical University Munich
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ryogenicareventearch withuperconductinghermometersCRESSTPresent and Future Cryogenic Dark Matter Search inEuropeEURECAEURECAWolfgang Rau, Technische Universität MünchenCRESST
  • Max-Planck-Institut for physics (Munich)
  • Technical University Munich
  • University of Oxford
  • Laboratori Nazionali del Gran Sasso
  • University of Tübingen
  • University of Warwick
  • EDELWEISS
  • CEA-Saclay DAPNIA/DRECAM
  • CRTBT Grenoble
  • CSNSM Orsay
  • FZK/Univ. Karlsruhe
  • IAP Paris
  • IPN Lyon
  • Laboratoire Souterrain de Modane
  • EURECA + CERN + MPIK (Heidelberg) + ...Wolfgang Rau, TUM Future Direct Detection, Chicago 12/04ILIASIntegrated Large Infrastructures for Astroparticle Science
  • Financed by EU
  • Infrastructure for astroparticle physics in Europe (not complete, but a good start)
  • Contains different structures:
  • Networks (Dark Matter, Double Beta, Underground Science, Gravitational Waves, Theory)
  • Joint Research Activities (Double Beta, LowBackground, Gravitational Waves)
  • Transnational Access (Underground laboratories)
  • 12 Countries, 20 Contractors / ~140 Institutes, > 1000 scientists
  • Forum for discussion of future plans in Europe
  • Wolfgang Rau, TUM Future Direct Detection, Chicago 12/04Overview
  • EDELWEISS
  • Technique
  • Status
  • Next Future
  • CRESST
  • Technique
  • Status
  • Next Future
  • EURECA
  • Idea
  • Plans
  • Status
  • Wolfgang Rau, TUM Future Direct Detection, Chicago 12/04W-TES: (Tc = 6-10 mK)W68 mm²Au heaterAl contactHeater for stabilization (DC)and calibration (test pulses)CRESST – Technique
  • Target: CaWO4
  • Cylindrical, /h: 4 cm
  • Mass: 300 g
  • Light output: ~ 1 % (g’s)
  • Light detector
  • 30  30  0.4 mm Si
  • Thresholds
  • Phonons: 2 keV
  • Light: 20 eV
  • ~2 keVee
  • Discrimination: 12 keV
  • Wolfgang Rau, TUM Future Direct Detection, Chicago 12/04Light energyReflectorCaWO4Recoil energyCRESST – TechniqueQuenching
  • Nuclear recoil less light than electron recoil!
  • Different light yield for different nuclei (O, Ca, W)?
  • Two experiments to measure Quenching (so far room temp.):
  • Neutron scattering
  • Ion beam
  • Both indicate: less light for heavy nuclei
  • Additional support from data-band-band
  • a-band between g- and n-band
  • recoiling nuclei from a-decay
  • (O)n-bandW-bandWolfgang Rau, TUM Future Direct Detection, Chicago 12/04Gran Sasso3600 m w.e.CRESST – TechniqueWolfgang Rau, TUM Future Direct Detection, Chicago 12/04Run 28, DaisyRun 28, Julia (bad light resolution)Light yieldLight yieldEnergy in Phonon Channel [keV]Energy in Phonon Channel [keV]CRESST – StatusSpring 2004: 2 months run with 2 detectors sensitivity limited by neutrons if high QF applies for WIMP recoils:results comparable to EDELWEISS (10-6 pb)Wolfgang Rau, TUM Future Direct Detection, Chicago 12/0466 SQUIDs on He-flangeCRESST – StatusShielded cryostatSince April 2004: upgrade
  • Install neutron moderator
  • (30-50 cm PE, 11 t); µ-veto
  • Increase number of readout channels (4  66)
  • Enlarge target mass (600 g  10 kg)
  • PE neutron moderatorPlastic scintill. m-vetoWolfgang Rau, TUM Future Direct Detection, Chicago 12/04CRESST – Next Future
  • Finish major work by beginning of 2005
  • Restart with few detectors
  • Install new detector holder late spring
  • Increase target mass to 10 kg within 2005
  • Situation in Gran Sasso not clear
  • (major construction work expected – influence on CRESST so far unknown)Wolfgang Rau, TUM Future Direct Detection, Chicago 12/04Ionization: Inner disk / outerring (“guard”)with a-Si / a-GeEDELWEISS - TechniqueTarget:cyl. Germanium crystal, 320 g 7.0 cm, height 20 mm (beveled)Thermal:NTD(~ 20 mK)Wolfgang Rau, TUM Future Direct Detection, Chicago 12/04EDELWEISS - TechniqueThresholds Heat: 0.4 – 2 keV Ionization: 1.1 – 1.5 keV Analysis Ion. trigger: 20 – 30 keV Phon. trig.: 15 keVResolutionHeat: 0.6 – 2 keV @ 10 keV 2 – 4 keV @ 122 keV Ion.: 2 – 3 keV @ 122 keVWolfgang Rau, TUM Future Direct Detection, Chicago 12/04EDELWEISS - Status2003 Data (3 new detectors)
  • Ion. trigger
  • 20 kg d
  • Thr:
  • 20/30 keV
  • 3 events
  • Phonon trigger
  • 22 kg d
  • Thr:
  • 15 keV
  • 18 events
  • 1 coinc. (n-n)
  • 2000 – 2003: 62 kg d, 40 events (only 3 for 30–100 keV)Wolfgang Rau, TUM Future Direct Detection, Chicago 12/04EDELWEISS - StatusNbSi sensors for athermal phononsNbSi meanderOuter electrode
  • NbSi: metal-isolator transition (high R)
  • 2 surfaces covered (ionization + heat sensors)
  • Two-component signal:
  • Thermal (energy)
  • Athermal (surface discrimination)
  • Successful test with 200 g modules in EW I:
  • 90 % rejection
  • 50 % efficiency
  • Wolfgang Rau, TUM Future Direct Detection, Chicago 12/04EDELWEISS – Next FutureEdelweiss II @ Modane (4800 m w.e.)
  • Aim for sensitivity improvement 100
  • Installation started 04/04 – expected to finish summer 05
  • 1st phase: 21 NTD detectors (320 g), 7 NbSi detectors (400 g)
  • Wolfgang Rau, TUM Future Direct Detection, Chicago 12/04Improved shielding
  • 20 cm lead
  • 50 cm PE
  • Muon veto
  • EDELWEISS – Next Future
  • Large new cryostat
  • low activity
  • inverse geometry
  • up to 120 detectors
  • Wolfgang Rau, TUM Future Direct Detection, Chicago 12/04EURECAuropeanndergroundarevent search withalorimeterrrayE U R E C AWolfgang Rau, TUM Future Direct Detection, Chicago 12/04EURECA – Idea
  • Next generation DM search to explore most of SUSY parameter space
  • Cryogenic experiments very promising
  • Target mass in the 1 ton range
  • Different targets (WIMP signature)
  • Collect European competence
  • Wolfgang Rau, TUM Future Direct Detection, Chicago 12/04EURECA – Plans
  • Discriminating cryogenic detector to reach a sensitivity  10-10 pb for coherent interaction
  • Better sensitivity for spin-dependent interaction
  • Design study to investigate requirements and technical challenges:
  • Detector development (larger modules, better discrimination, other targets)
  • Optimal shielding strategies
  • Background reduction (handling/cleaning) and modeling (Monte Carlo simulations)
  • Cryogenics, electronics, cabling, DAQ
  • Wolfgang Rau, TUM Future Direct Detection, Chicago 12/04 ILIAS ILIASEURECA – PlansStructured in Working groups:
  • Detector Development
  • Low Radioactivity
  • Neutron Background, µ-veto and Shielding
  • Cryogenics
  • Cabling
  • DAQ
  • Underground site issues
  • Wolfgang Rau, TUM Future Direct Detection, Chicago 12/04EURECA – Status
  • Letter of Intent to ApPEC summer 2004
  • Start proposal process September 2004
  • Present Proposal to ApPEC January 2005
  • Present Proposal to Funding Agencies
  • Start work 2005/06 ???
  • Wolfgang Rau, TUM Future Direct Detection, Chicago 12/04
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