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First results on light readout from the 1-ton ArDM liquid argon detector for dark matter searches

2010; Institute of Physics; Volume: 5; Issue: 11 Linguagem: Inglês

10.1088/1748-0221/5/11/p11003

1748-0221

The ArDM Collaboration, C. Amsler, A. Badertscher, V. Boccone, A. Bueno, M. C. Carmona-Benitez, W. Creus, A. Curioni, M. K. Daniel, E. Dawe, U. Degunda, A. Gendotti, L. Epprecht, Shin Horikawa, Lilian Kaufmann, L. Knecht, M. Laffranchi, C. Lazzaro, P.K. Lightfoot, D Lussi, J. J. Lozano Bahilo, A. Marchionni, K. Mavrokoridis, A J Melgarejo, P. Mijakowski, G. Natterer, S. Navas, P Otyugova, Mariano De Prado, P. Przewłocki, C. Regenfus, F. Resnati, M. Robinson, J. Rochet, L. Romero, E. Rondio, A. Rubbia, L. Scotto-Lavina, N.J.C. Spooner, T. Strauss, J. Ulbricht, T. Viant,

Particle Detector Development and Performance

ArDM-1t is the prototype for a next generation WIMP detector measuring both the scintillation light and the ionization charge from nuclear recoils in a 1-ton liquid argon target. The goal is to reach a minimum recoil energy of 30 keVr to detect recoiling nuclei. In this paper we describe the experimental concept and present results on the light detection system, tested for the first time in ArDM on the surface at CERN. With a preliminary and incomplete set of PMTs, the light yield at zero electric field is found to be between 0.3-0.5 phe/keVee depending on the position within the detector volume, confirming our expectations based on smaller detector setups.