CRESST and EURECA

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CRESST and EURECA Present and future cryogenic
dark matter searches
Sam Henry University of Oxford
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Phonon Scintillation
Discrimination of nuclear recoils from
radioactive backgrounds (electron recoils) by
simultaneous measurement of phonons and
scintillation light
high rejection99.7 gt 15 keV99.9 gt 20 keV
Energy in light channel keVee
Energy in phonon channel
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CRESST II Results 2004
Run28, 2004, 10.5 kg d
Light/Phonon energy
90 W-Recoils
Energy in Phonon Channel / keV
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CRESST Results 2007
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Upper Limit for Spin-independent WIMP Nucleon
Cross section for cryogenic detector experiments
CRESST / EDELWEISS Results
(Preliminary)
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European Underground Rare Event Calorimeter Array

• Search to s10-10pb
• (1 event/tonne/year)
• CRESST and EDELWEISS,
• with additional groups joining.
• Target Ge, CaWO4, ZnWO4.
• (A dependence)
• Mass above 100 kg towards 1 tonne
• Modane Laboratory

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EURECA challenges

• Detectors
• Large volume 1000kg
• Multiple target materials Ge scintillators
• Radiopurity
• Maintain background discrimination
• Cryostat
• Cool 1000kg to 10mK
• Allow easy removal / insertion of detectors
• Readout
• 1000 channels
• Radiation shielding
• Neutrons

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EURECA Collaboration
CRESST EDELWEISS ROSEBUD
France CEA/DAPNIA Saclay CEA/DRECAM
Saclay CNRS/CRTBT Grenoble CNRS/CSNSM
Orsay CNRS/IPNL Lyon CNRS/IAP
Paris Spain Zaragoza CERN
United Kingdom Oxford (H Kraus,
coordinator) Germany MPI für Physik,
Munich Technische Universität München Universitä
t Tübingen Universität Karlsruhe Forschungszentr
um Karlsruhe Russia DNLP Dubna Ukraine INR
Kiev