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Communication Dans Un Congrès Année : 2018

The Virgo Coating Collaboration: a detailed study on thermoelasticity in crystalline materials and other research lines

E. Cesarini
  • Fonction : Auteur
M. Lorenzini
  • Fonction : Auteur
J. Dickmann
  • Fonction : Auteur
V. Fafone
  • Fonction : Auteur
D. Heinert
  • Fonction : Auteur
S. Kroker
  • Fonction : Auteur
D. Lumaca
  • Fonction : Auteur
F. Martelli
  • Fonction : Auteur
R. Nawrodt
  • Fonction : Auteur
F. Piergiovanni
  • Fonction : Auteur
C.B. Rojas Hurtado
  • Fonction : Auteur

Résumé

The visibility distance of interferometric gravitational wave detectors is limited by mirror thermalnoise at mid-range frequency, where the first coalescence GW signals have been detected andwhere many others are expected in the next future. In particular, for enhanced second generationand third generation we need to increase the performance of the test mass multilayer reflectivecoatings. The Virgo collaboration is setting up a coating R&D group on many issues, includingespecially metrology (loss angle measurements, thermoelastic effect modeling), new materials(new oxides, nitrates, fluoride, new cosputtered mixing and nanolayered composites) completelycharacterized (optically, mechanically and morphologically), optimization of deposition parameters,with the aim of developing new coating materials and technologies for the AdVirgo upgradesand for future detectors. Another objective is to understand the losses in amorphous materials,framing coating research in the more general context of the physics of glasses and amorphousmaterials. One of the developed research lines is the study of thermoelastic damping in crystallinematerials, that are promising candidates for cryogenic test masses and particularly suitablesubstrates for coating research. A detailed discussion on models, based on a semi-analytical calculationstarting from the heat diffusion equation, for crystalline substrates will be reported. Anew study on the changes in thermoelastic loss after coating deposition, with some preliminaryresults, will be also reported.

Dates et versions

hal-01914894 , version 1 (07-11-2018)

Identifiants

Citer

E. Cesarini, M. Lorenzini, A. Amato, G. Cagnoli, Q. Cassar, et al.. The Virgo Coating Collaboration: a detailed study on thermoelasticity in crystalline materials and other research lines. Gravitational-waves Science&Technology Symposium, Mar 2018, Padova, Italy. pp.006, ⟨10.22323/1.325.0006⟩. ⟨hal-01914894⟩
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