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Activity of LUMEN (1996-97) : Understanding of PbWO4 Scintillator Characteristics and their Optimisation
/ Baccaro, Stefania (ENEA, INN-TEC, Casaccia, Roma, Italy) ; Bohácek, P (Institute of Physics, Academy of Science, Prague, Czech Republic) ; Borgia, Bruno (Dipartimento di Fisica, Universita La Sapienza, Roma, Italy) ; Cecilia, Angelica (ENEA, INN-TEC, Casaccia, Roma, Italy) ; Croci, S (INFM, Dipartimento Scienza dei Materiali, Univ. di Milano) ; Dafinei, Ioan (Dipartimento di Fisica, Universita La Sapienza, Roma, Italy) ; Diemoz, Marcella (Dipartimento di Fisica, Universita La Sapienza, Roma, Italy) ; Fabeni, P (IROE-CNR, Firenze, Italy) ; Festinesi, Armando (ENEA, INN-TEC, Casaccia, Roma, Italy) ; Jarolímek, O (CRYTUR, Turnov, Czech Republic) et al.
The aim of the LUMEN co-operation, supported by INFN, is to obtain ful experimental characterisation and deep expertise of heavy scintillator for high energy physics. The advantage of this collaboration was mainly in the complementary character of the experimental techniques available in the partner laboratories and in the availability of highly experienced scientists indifferent fields. [...]
CMS-NOTE-1998-067.-
Geneva : CERN, 1998
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APD Properties and Recovery from Radiation Damage
/ Baccaro, Stefania (INFN - Sezione di Roma, INFN - Sezione di Roma, ENEA-INN/TEC Casaccia Research Center, Roma, Italy) ; Borgia, Bruno (INFN - Sezione di Roma, Department of Physics, Universita 'La Sapienza', Roma, Italy) ; Caruso, S (INFN - Sezione di Roma, INFN - Sezione di Roma, ENEA-INN/TEC Casaccia Research Center, Roma, Italy) ; Cavallari, Francesca (INFN - Sezione di Roma, Department of Physics, Universita 'La Sapienza', Roma, Italy) ; Dafinei, Ioan (INFN - Sezione di Roma, Department of Physics, Universita 'La Sapienza', Roma, Italy) ; Diemoz, Marcella (INFN - Sezione di Roma, Department of Physics, Universita 'La Sapienza', Roma, Italy) ; Emeliantchik, Igor (Bielorussian State Univerisity, Minsk, Bielorussia) ; Festinesi, Armando (INFN - Sezione di Roma, Department of Physics, Universita 'La Sapienza', Roma, Italy) ; Longo, Egidio (INFN - Sezione di Roma, Department of Physics, Universita 'La Sapienza', Roma, Italy) ; Montecchi, Marco (INFN - Sezione di Roma, INFN - Sezione di Roma, ENEA-INN/TEC Casaccia Research Center, Roma, Italy) et al.
Avalanche photodiodes will be used to detect scintillation light from PWO crystals in the CMS electromagnetic calorimeter. Properties of Hamamatsu APD are reported special attention has been devoted to the study of radiation hardness and room temperature annealing. [...]
CMS-NOTE-1997-030.-
Geneva : CERN, 1997
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Radiation Damage Mechanism in PbWO4 Crystal and Radiation Hardness Quality Control of PWO Scintillators for CMS
/ Baccaro, Stefania (INFN - Sezione di Roma, ENEA - INN/TEC - Casaccia Research Center, Roma, Italy) ; Auffray, Etiennette (CERN) ; Borgia, Bruno (Department of Physics, University of Roma "La Sapienza", Roma, Italy) ; Cavallari, Francesca (Department of Physics, University of Roma "La Sapienza", Roma, Italy) ; Cecilia, Angelica (INFN - Sezione di Roma, ENEA - INN/TEC - Casaccia Research Center, Roma, Italy) ; Dafinei, Ioan (Department of Physics, University of Roma "La Sapienza", Roma, Italy) ; Diemoz, Marcella (Department of Physics, University of Roma "La Sapienza", Roma, Italy) ; Lecoq, Paul (CERN) ; Longo, Egidio (Department of Physics, University of Roma "La Sapienza", Roma, Italy) ; Montecchi, Marco (Department of Physics, University of Roma "La Sapienza", Roma, Italy) et al.
The optical damage induced by UV light in PbWO4 crystals is found to be similar to that induced by g radiation. Due to the peculiarities of optical absorption in PbWO4, the damage induced by UV light is a bulk process. [...]
CMS-NOTE-1997-038.-
Geneva : CERN, 1997
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Detection of Photons Generated in PWO Scintillator Crystals
/ Baccaro, Stefania (ENEA-INN-TEC, Roma, Italy) ; Borgia, Bruno (La Sapienza, Roma, Italy) ; Cavallari, Francesca (La Sapienza, Roma, Italy) ; Dafinei, Ioan (ENEA-INN-TEC, Roma, Italy) ; Diemoz, Marcella (La Sapienza, Roma, Italy) ; Festinesi, Armando (ENEA-INN-TEC, Roma, Italy) ; Longo, Egidio (La Sapienza, Roma, Italy) ; Montecchi, Marco (ENEA-INN-TEC, Roma, Italy) ; Organtini, Giovanni (Univ. Roma TRE, Roma, Italy) ; Piegari, A (ENEA-INN-TEC, Roma, Italy)
This work deals with the optical characterization of the surface of EG&G; and Hamamatsu APD's and performance of an antireflection coating made of Y2O3 and deposited on a PWO test piece. The effectiveness of antireflection treatments of PWO and Si surfaces is evaluated in a simplified and a realistic situation by means of the ratio of "detected to emitted photons". [...]
CMS-NOTE-1997-060.-
Geneva : CERN, 1998
- Published in : Nucl. Instrum. Methods Phys. Res., A 406 (1998) 276-286
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Further understanding of PbWO4 Scintillator characteristics and their optimisation. LUMEN activity in 1998
/ Baccaro, Stefania (INFN, Roma and ENEA, INN/TEC, Casaccia, Roma, Italy) ; Bohácek, P (titute of Physics, Academy of Science, Prague, Czech Republic) ; Borgia, Bruno (Univ. La Sapienza, Roma, Italy) ; Cecilia, Angelica (Univ. La Sapienza, Roma, Italy) ; Dafinei, Ioan (Univ. La Sapienza, Roma, Italy) ; Diemoz, Marcella (Univ. La Sapienza, Roma, Italy) ; Fabeni, P (INFM, Univ. di Milano, Italy) ; Festinesi, Armando (INFN, Roma and ENEA, INN/TEC, Casaccia, Roma, Italy) ; Longo, Egidio (Univ. La Sapienza, Roma, Italy) ; Martini, M (INFM, Univ. di Milano, Italy) et al.
The aim of LUMEN collaboration was the investigation on single crystals of PbWO4 ( PWO): the results performed up to now provide the evidence of the possibility to optimise the optical properties of an intrinsic scintillator such as PWO. The control of essential requirements in the crystal preparation ( raw material purity, growing methods and post-growth annealing) as well as the introduction of selected dopants at suitable concentrations ( particularly trivalent and pentavalent ions) were found to be very successful in lowering the concentration of point defects in the lattice which strongly affect scintillation properties and radiation hardness. [...]
CMS-NOTE-2000-002.-
Geneva : CERN, 2000
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Tools for the Inspection of PWO//APD Gluing
/ Baccaro, Stefania (INFN, Roma, Italy) ; Borgia, Bruno (INFN, Roma, Italy) ; Cavallari, Francesca (INFN, Roma, Italy) ; Dafinei, Ioan (INFN, Roma, Italy) ; Diemoz, Marcella (INFN, Roma, Italy) ; Longo, Egidio (INFN, Roma, Italy) ; Montecchi, Marco (INFN, Roma, Italy) ; Organtini, Giovanni (INFN, Roma, Italy)
The light produced in each of the 60 thousand PWO crystals of the CMS barrel electromagnetic calorimeter will be readout by Avalanche Photodiodes ( APD). The ratio detected to emitted photons also depends on the PWO//APD gluing quality that must be checked before the crystal mounting in the calorimeter. [...]
CMS-NOTE-1998-024.-
Geneva : CERN, 1998
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