author = "Furtado, S{\'e}rgio Ricardo and Aguiar, Odylio Denys",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "Development of a very high sensitivity parametric transducer for 
                         the Mario Schenberg gravitational wave detector: progress report",
            booktitle = "Anais...",
                 year = "2006",
         organization = "Reuni{\~a}o Anual da Sociedade Astron{\^o}mica Brasileira, 32.",
             abstract = "We have constructed the Mario Schenberg gravitational wave 
                         detector at the Physics Institute of the University of S{\~a}o 
                         Paulo as programmed by the Brazilian Graviton Project, under the 
                         full support of FAPESP. We are ready to do a first test run of the 
                         spherical antenna at 4.2K with three parametric transducers and an 
                         initial target sensitivity of h~10-21Hz-1/2 in a 60Hz bandwidth 
                         around 3.2kHz. The parametric transducers to be used on the Mario 
                         Schenberg detector consist of reentrant klystron copperaluminum 
                         cavities having a central post with a narrow gap (~40mm) between 
                         its top and an oscillating end wall, mechanically coupled to the 
                         gravitational wave spherical antenna at its quadrupolar mode 
                         resonant frequency. The performance of the transducer depends on 
                         some cavity parameters such as the electrical Q, the electrical 
                         coupling and cavity dimensions. Here we present some recent 
                         results of the development of this project, such as niobium layer 
                         deposition in the transducer cavities, the design of silicon 
                         membranes for the last transducer mechanical mode, and measurement 
                         and tunning of the mechanical and electric resonances 
  conference-location = "Atibaia, SP",
      conference-year = "30 jul - 03 ago",
                label = "self-archiving-INPE-MCTIC-GOV-BR",
             language = "pt",
         organisation = "Sociedade Astron{\^o}mica Brasileira",
           targetfile = "furtado-development.pdf",
        urlaccessdate = "22 jan. 2021"