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Development of an automatic scanning system for nuclear emulsion analysis in the OPERA experiment and study of neutrino interactions location

Identifieur interne : 000066 ( Hal/Corpus ); précédent : 000065; suivant : 000067

Development of an automatic scanning system for nuclear emulsion analysis in the OPERA experiment and study of neutrino interactions location

Auteurs : Luisa Arrabito

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RBID : Hal:tel-00283267

Mots-clés :

Abstract

Following SuperKamiokande and K2K experiments, OPERA (Oscillation Project with Emulsion tRacking Apparatus), aims to confirm neutrino oscillation in the atmospheric sector. Taking advantage of a technique already employed in CHORUS and in DONUT, the Emulsion Cloud Chamber (ECC), OPERA will be able to observe the nµ® nt oscillation, through the nt appearance in a pure nµ beam. The OPERA experiment, with its ~100000 m2 of nuclear emulsions, needs a very fast automatic scanning system. Optical and mechanics components have been customized in order to achieve a speed of about 20 cm2/hour per emulsion layer (44 μm thick), while keeping a sub-micrometric resolution.
The first part of this thesis was dedicated to the optimization of 4 scanning systems at the French scanning station, based in Lyon. An experimental study on a dry objective scanning system has also been realized. The obtained results show that the performances of dry scanning are similar with respect to the traditional oil scanning, so that it can be successfully used for OPERA.
The second part of this work was devoted to the study of the neutrino interaction location and reconstruction strategy actually used in OPERA. A dedicated test beam was performed at CERN in order to simulate OPERA conditions. The obtained results definitely confirm that the proposed strategy is well adapted for tau search.


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Hal:tel-00283267

Le document en format XML

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The first part of this thesis was dedicated to the optimization of 4 scanning systems at the French scanning station, based in Lyon. An experimental study on a dry objective scanning system has also been realized. The obtained results show that the performances of dry scanning are similar with respect to the traditional oil scanning, so that it can be successfully used for OPERA.
The second part of this work was devoted to the study of the neutrino interaction location and reconstruction strategy actually used in OPERA. A dedicated test beam was performed at CERN in order to simulate OPERA conditions. The obtained results definitely confirm that the proposed strategy is well adapted for tau search.</div>
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<abstract xml:lang="en">Following SuperKamiokande and K2K experiments, OPERA (Oscillation Project with Emulsion tRacking Apparatus), aims to confirm neutrino oscillation in the atmospheric sector. Taking advantage of a technique already employed in CHORUS and in DONUT, the Emulsion Cloud Chamber (ECC), OPERA will be able to observe the nµ® nt oscillation, through the nt appearance in a pure nµ beam. The OPERA experiment, with its ~100000 m2 of nuclear emulsions, needs a very fast automatic scanning system. Optical and mechanics components have been customized in order to achieve a speed of about 20 cm2/hour per emulsion layer (44 μm thick), while keeping a sub-micrometric resolution.
The first part of this thesis was dedicated to the optimization of 4 scanning systems at the French scanning station, based in Lyon. An experimental study on a dry objective scanning system has also been realized. The obtained results show that the performances of dry scanning are similar with respect to the traditional oil scanning, so that it can be successfully used for OPERA.
The second part of this work was devoted to the study of the neutrino interaction location and reconstruction strategy actually used in OPERA. A dedicated test beam was performed at CERN in order to simulate OPERA conditions. The obtained results definitely confirm that the proposed strategy is well adapted for tau search.</abstract>
<abstract xml:lang="fr">Dans la continuité des expériences SuperKamiokande et K2K, OPERA (Oscillation Project with Emulsion tRacking Apparatus), cherchera à confirmer l'oscillation des neutrinos dans le secteur atmosphérique. Utilisant une technique déjà employée dans CHORUS et DONUT, la chambre à brouillard d'émulsion (Emulsion Cloud Chamber (ECC)), cette expérience permettra la mise en évidence de l'oscillation nµ® nt par apparition de nt dans un faisceau pur de nµ.
L'expérience OPERA, avec ses ~100000 m2 d'émulsions nucléaires, nécessite l'utilisation de systèmes de scan automatiques ultra rapides. Les composantes optiques et mécaniques de ces systèmes ont été optimisées pour atteindre une vitesse de scan de ~20 cm2/heure par couche d'émulsion (44 μm d'épaisseur), tout en gardant une résolution sub-micrométrique.
Dans la première partie de mon travail de thèse, je me suis consacrée à l'optimisation des 4 systèmes de scan au sein de l'unique station de scan française basée à Lyon. Une étude expérimentale sur les performances d'un scan utilisant un objectif à sec a été également réalisée. Les résultats obtenus montrent que les performances d'un scan « à sec » sont similaires à celles d'un scan traditionnel utilisant un objectif à huile.
La deuxième partie de mon travail a consisté à valider la stratégie actuellement utilisée dans OPERA pour la localisation et la reconstruction des vertex de l'interaction des neutrinos, à l'aide d'un test sur faisceau dédié. Les résultats obtenus confirment définitivement que la stratégie proposée est bien adaptée à la recherche du lepton tau.</abstract>
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