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Analyse de la sensibilité du détecteur d'ondes gravitationnelles Virgo

Abstract : The Virgo detector for gravitational waves is a laser interferometer with arms which are 3 km long. This interferometer is at present in its commissioning phase whose goal is to reach the Virgo nominal sensitivity. To this purpose it is necessary to reduce the technical noises which are limiting the sensitivity during this phase. The work described in this thesis focuses on the analysis of technical noises.
The noises which are known to be likely to limit the sensitivity are first described and their propagation mechanism is also explained. The method used to analyse the technical noises is then presented. It first consists in identifying the possible noise sources by looking for coherence between the interferometer signals. Then it is useful to understand how the noise propagates into the interferometer. This is done by building analytical models of propagation. Some studies based on a simulation of the detector have been added to the analysis of interferometer data.
Between the end of 2003 and the end of 2005, the advance of the commissioning has been punctuated with seven technical data taking periods, performed in order to check the evolution of the detector performance. The analysis of the noises limiting the interferometer sensitivity for each of these data taking is presented in this thesis. The impact of the technical upgrades implemented on the interferometer to suppress the effect of these noises is also discussed.
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Submitted on : Thursday, November 9, 2006 - 10:28:21 AM
Last modification on : Friday, November 6, 2020 - 3:25:50 AM
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R. Gouaty. Analyse de la sensibilité du détecteur d'ondes gravitationnelles Virgo. Physique des Hautes Energies - Expérience [hep-ex]. Université de Savoie, 2006. Français. ⟨tel-00112568⟩

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