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Present and future activities of the Garching group (E15)

Present and future activities of the Garching group (E15). JRA1 meeting Paris 20.02.2007. J.-C. Lanfranchi. E15 cryogroup: CRESST, EURECA, CNNS F. von Feilitzsch W. Potzel J.-C. Lanfranchi W. Westphal (PhD) C. Coppi (PhD) Ch. Isaila (PhD) Ch. Ciemniak (PhD) S. Pfister (PhD)

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Present and future activities of the Garching group (E15)

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  1. Present and future activities of the Garching group (E15) JRA1 meeting Paris 20.02.2007 J.-C. Lanfranchi

  2. E15 cryogroup: CRESST, EURECA, CNNS F. von Feilitzsch W. Potzel J.-C. Lanfranchi W. Westphal (PhD) C. Coppi (PhD) Ch. Isaila (PhD) Ch. Ciemniak (PhD) S. Pfister (PhD) S. Roth (Dipl.) A. Gütlein (Dipl.) H. Hagn (Tech.) E15 scintillator development: BOREXINO, DoubleCHOOZ, LENA F. von Feilitzsch L. Oberauer W. Potzel M. Goeger-Neff T. Marrodan (PhD) M.Wurm (PhD) J. Winter (Dipl.) T. Wiebke (Dipl.) P. Pfahler (Dipl.) M. Hofmann (Dipl.) H. Hagn (Tech.) SFB375 (finished), TR27 ‚Neutrinos and Beyond‘ (transregional researchprogram) excellence cluster ‚Structure and Origin of the Universe‘

  3. SPT (Superconducting Phase-transition- Thermometer) Phonon-detector CaWO4-Crystal Reflector ca. 5- 50 mK SPT Light-detector Silicon-Substrate CRESST Detector Development •  heat + scintillation light measurement • for background rejection • @ E15: • reproducibility of W and Ir/Au SPTs • CaWo4 crystal growth / radiopurity aspects • enhancement of light detector via • Neganov-Luke effect • - test of detector modules in UGL Garching

  4. Crystal Growth production of CaWO4 crystals (PhD, Ch. Ciemniak) for CRESST ( EURECA?) collaborational work with crystallab in Garching (Dr.A. Erb) investigation of scintillating properties investigation of radiopurity first cryodetector made from such a crystal in preparation

  5. Light Detectors with Neganov-Luke Amplification Combination of the calorimetric and the ionization measurement techniques Neganov-Luke Effect: charges drifting across the detector generate heat by measuring this heat the amount of ionization can be determined Present detector design involves composite TES technique

  6. Application of the Neganov-Luke Effect Vb=0V Vb=50V electron recoils nuclear recoils • Result: improvement of FWHM base line noise of the light signal from 17 keV  6 keV • improved discrimination of the different recoil bands  powerful tool for neutron rejection • ongoing development in cooperation with KETEK GmbH

  7. Neutron detectors Cryostat with detector TOF Pulsed Neutron source Scattering angle Energy measurement via time of light Quenching Factor Measurement@ ~10mK • new KELVINOX400 dilution refrigerator was set up @ MLL Garching • first beam time forseen in June 2007 after mounting of SQUIDs and electronics • additionally: new table top neutron source acquired for test purposes Experimental setup:

  8. Al2O3 (20x10x1 mm3) Composite Detectors • development performed for GALLEX/GNO • prefabricated & tested Ir/Au TES • on Si-substrate • separation of main absorber & TES • low energy threshold Detector A Pulse shape allows attribution of events in the composite detector • powerful tool: • surface background rejection • possibility • preselection of (best) TESs • possible • mass production of micro TESs • feasible •  detector design for CNNS ? Al2O3 Si

  9. Pulse height [channels] K-capture 71Ge measurement L-capture Time [d] 71Ge longterm measurementswith composite detectors  measurements performed in UGL Garching

  10. UGL Garching (15 m.w.e.): • testsite for cryogenic detectors • 3 Ge-detectors for material analysis Cryostat (KELVINOX100) External lead shielding (10-15cm) m-veto

  11. m-Veto, 15 plastic scintillator panels 3He/4He dilution refrigerator Dewar (OVC) External Pb shielding, Thickness: 15cm upper part: 10cm Electrical contactation ports lq. Helium channel for external g-sources He pumping lines Internal shielding: Sintimid Cu 5mm Pb 23mm Cu 5mm Pb 23mm Cu 10mm Sintimid Detector holder Inner vacuum (IVC) 3He/4He mixing chamber (~10mK) Low-activity Pb (<5Bq/kg) Experimental setup in the UGL

  12. New Underground Laboratoryin Garching (UGL2) • new underground laboratory to be built in 2007 in the framwork of the excellence • cluster ‚ Structure and Origin of the Universe‘ • ~15 m.w.e. ~6m of rock overburden • ~100m2, ~400m3: g-spectroscopy for material analysis, scintillator development • and low temperature experiments: • - 2-3 Ge-detectors • - 2 cryostats • - ~6m long tube for investigating scintillator properties (DoubleChooz, LENA) • investigation of growing crystals (CaWO4) underground ? • storage area for low background materials: Cu, Pb, crystals, …

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