Freiburg 2008 – scientific programme
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T: Fachverband Teilchenphysik
T 87: Niederenergie-Neutrinophysik und Suche nach Dunkler Materie II
T 87.9: Talk
Tuesday, March 4, 2008, 18:45–19:00, KGI-HS 1098
Operation of a GERDA phase I prototype detector in liquid argon — •Marik Barnabé Heider1, Carla Cattadori2, Oleg Chkvorets1, Assunta Di Vacri2, Konstantin Gusev3, 4, Stefan Schönert1, and Mark Shirchenko3, 4 for the GERDA collaboration — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany — 2Laboratori Nazionali del Gran Sasso, S.S. 17 bis km.18.910 Assergi (AQ), Italy — 3Russian Research Center Kurchatov Institute, 123182 Moscow, Russia — 4Joint Institute for Nuclear Research, 141980 Dubna, Russia
A non-enriched high-purity (HP) p-type germanium diode has been operated in a low mass holder in liquid nitrogen and liquid argon. Because of the shielding and scintillation properties of liquid argon, GERDA experiment is planned to use it as a cryogenic fluid shield. Therefore, the long-term measurements with the bare detector are performed in liquid argon. The testing of the prototype detector and the preparation of the enriched detectors for GERDA phase I are being carried out in the GERDA underground Detector Laboratory (GDL) at LNGS. The phase I prototype detector assembly is being operated since beginning of 2006 to study detector handling protocols, detector assemply performance and detector assembly stability. 45 warming and cooling cyclings have been carried out. Since February 8 2007, the prototype detector is continuously operated in liquid argon under varying irradiation conditions. The operations, measurements and results of the prototype detector testing as well as the status of the phase I enriched detectors will be summarized.