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CRESST and EURECA Present and future cryogenic dark matter searches

CRESST and EURECA Present and future cryogenic dark matter searches. Sam Henry University of Oxford. Phonon – Scintillation. s eparate calorimeter as light detector. W-SPT. 300 g CaWO 4. W-SPT. light reflector.

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CRESST and EURECA Present and future cryogenic dark matter searches

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  1. CRESST and EURECA Present and future cryogenic dark matter searches Sam Henry University of Oxford

  2. Phonon – Scintillation separate calorimeter as light detector W-SPT 300 g CaWO4 W-SPT light reflector Discrimination of nuclear recoils from radioactive backgrounds (electron recoils) by simultaneous measurement of phonons and scintillation light high rejection:99.7% > 15 keV99.9% > 20 keV Energy in light channel keVee] Energy in phonon channel

  3. CRESST II – Results2004 1.5 1.0 0.5 0.0 90% O-Recoils -0.5 0 50 100 150 Run28, 2004, 10.5 kg d Light/Phonon energy 90% W-Recoils Energy in Phonon Channel / keV

  4. CRESST – Results2007

  5. CRESST / EDELWEISS – Results Upper Limit for Spin-independent WIMP Nucleon Cross section for cryogenic detector experiments (Preliminary)

  6. EuropeanUndergroundRareEventCalorimeterArray • Search to σ~10-10pb • (~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

  7. 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

  8. 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 Universität Tübingen Universität Karlsruhe Forschungszentrum Karlsruhe Russia DNLP Dubna Ukraine INR Kiev

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