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Optimization of light collection from crystal scintillators for cryogenic experiments

4th International Conference on Current Problems in Nuclear Physics and Atomic Energy, NPAE 2012 - Proceedings (2013) 400-403

Authors:

VM Mokina, FA Danevich, VV Kobychev, H Kraus, VB Mikhailik, LL Nagornaya

Abstract:

Cryogenic scintillation bolometers are a promising technique to search for dark matter and neutrinoless double β decay. Improvement of light collection and energy resolution are important requirements in such experiments. Energy resolutions and relative pulse amplitudes of scintillation detectors using ZnWO4 scintillation crystals of different shapes (cylinder Ø 20 × 20 mm and hexagonal prism with diagonal 20 mm and height 20 mm), reflector materials and shapes, optical contact and surface properties (polished and diffused) were measured. The crystal scintillator of hexagonal shape shows the better energy resolution and pulse amplitude. The best energy resolution (FWHM = 9.3 % for 662 keV γ quanta of 137Cs) was obtained with a hexagonal scintillator with all surfaces diffuse, in optical contact with a PMT and surrounded by a reflector (3M) of size Ø 26 × 25 mm. In the geometry "without optical contact" representing the conditions of light collection for a cryogenic scintillating bolometer the best energy resolution and relative pulse amplitude was obtained for a hexagonal shape scintillator with diffuse side and polished face surfaces, surrounded by a reflector with a gap between the scintillator and the reflector.

Axion searches with the EDELWEISS-II experiment

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2013) ARTN 067

Authors:

E Armengaud, Q Arnaud, C Augier, A Benoit, A Benoit, L Berge, T Bergmann, J Bluemer, A Broniatowski, V Brudanin, P Camus, A Cazes, B Censier, M Chapellier, F Charlieux, F Couedo, P Coulter, GA Cox, T de Boissiere, M De Jesus, Y Dolgorouky, AA Drillien, L Dumoulin, K Eitel, D Filosofov, N Fourches, J Gascon, G Gerbier, M Gros, L Hehn, S Henry, S Herve, G Heuermann, N Holtzer, V Humbert, A Juillard, C Kefelian, M Kleifges, H Kluck, V Kozlov, H Kraus, VA Kudryavtsev, H Le Sueur, M Mancuso, C Marrache-Kikuchi, S Marnieros, A Menshikov, X-F Navick, C Nones, E Olivieri, P Pari, B Paul, MC Piro, O Rigaut, M Robinson, S Rozov, V Sanglard, B Schmidt, B Siebenborn, D Tcherniakhovski, M Tenconi, L Vagneron, RJ Walker, M Weber, E Yakushev, X Zhang
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Development of techniques for characterisation of scintillation materials for cryogenic application

Radiation Measurements (2013)

Authors:

VB Mikhailik, H Kraus
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Search for low-mass WIMPs with EDELWEISS-II heat-and-ionization detectors

Physical Review D - Particles, Fields, Gravitation and Cosmology 86:5 (2012)

Authors:

E Armengaud, C Augier, A Benoît, L Bergé, T Bergmann, J Blümer, A Broniatowski, V Brudanin, B Censier, M Chapellier, F Charlieux, F Couëdo, P Coulter, GA Cox, J Domange, AA Drillien, L Dumoulin, K Eitel, D Filosofov, N Fourches, J Gascon, G Gerbier, J Gironnet, M Gros, S Henry, G Heuermann, S Hervé, A Juillard, M Kleifges, H Kluck, V Kozlov, H Kraus, VA Kudryavtsev, H Le Sueur, P Loaiza, S Marnieros, A Menshikov, XF Navick, C Nones, E Olivieri, P Pari, B Paul, M Robinson, S Rozov, V Sanglard, B Schmidt, B Siebenborn, D Tcherniakhovski, AS Torrento-Coello, L Vagneron, RJ Walker, M Weber, E Yakushev, X Zhang

Abstract:

We report on a search for low-energy (E<20keV) WIMP-induced nuclear recoils using data collected in 2009-2010 by EDELWEISS from four germanium detectors equipped with thermal sensors and an electrode design (ID) which allows to efficiently reject several sources of background. The data indicate no evidence for an exponential distribution of low-energy nuclear recoils that could be attributed to WIMP elastic scattering after an exposure of 113kg•d. For weakly interacting massive particles (WIMPs) of mass 10 GeV, the observation of one event in the WIMP search region results in a 90% C.L. limit of 1.0×10 -5pb on the spin-independent WIMP-nucleon scattering cross-section, which constrains the parameter space associated with the findings reported by the CoGeNT, DAMA and CRESST experiments. © 2012 American Physical Society.
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A multi-tiered data structure and process management system based on ROOT and CouchDB

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 684 (2012) 63-72

Authors:

GA Cox, E Armengaud, C Augier, A Benoît, L Bergé, T Bergmann, J Blümer, G Bres, A Broniatowski, V Brudanin, B Censier, M Chapellier, G Chardin, F Charlieux, S Collin, P Coulter, O Crauste, M De Jésus, J Domange, L Dumoulin, K Eitel, D Filosofov, N Fourches, J Gascon, G Gerbier, J Gironnet, M Gros, S Henry, S Hervé, S Jokisch, A Juillard, M Kleifges, H Kluck, V Kozlov, H Kraus, VA Kudryavtsev, P Loaiza, S Marnieros, A Menshikov, XF Navick, C Nones, E Olivieri, P Pari, L Pattavina, B Paul, M Robinson, H Rodenas, S Rozov, V Sanglard, B Schmidt, S Semikh, D Tcherniakhovski, AS Torrento-Coello, M Unrau, L Vagneron, MA Verdier, RJ Walker, M Weber, E Yakushev, X Zhang

Abstract:

A multi-tiered data structure, analysis toolkit and data processing management system has been constructed using ROOT and CouchDB. This system is well suited for experiments that acquire many computer files of raw data over the course of months or years, that are distributed to different computing centers and further reduced in size by several steps of data processing. Data handling for experiments searching for rare events extracted from digitized pulse traces typically fit this description. An implementation of this system has been constructed for the EDELWEISS-III experiment and is described here in some detail. This solution may also serve as a prototype system for the proposed EURECA experiment. © 2012 Elsevier B.V. All rights reserved.
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