@InProceedings{FurtadoAguiCastBarr:2009:HiNiKl,
               author = "Furtado, S{\'e}rgio Ricardo and Aguiar, Odylio Denys de and 
                         Castro, Pedro Jos{\'e} and Barroso de Castro, Joaquim Jos{\'e}",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)}",
                title = "High-Q niobium klystron cavities for use in gravitational wave 
                         detectors",
            booktitle = "Proceedings...",
                 year = "2009",
         organization = "SBMO International Microwave and Optoelectronics Conference.",
             keywords = "klystron cavity, superconducting niobium, parametric transducer, 
                         gravitational wave detector.",
             abstract = "The main purpose of this work was to measure the resonant 
                         frequency and the Q-factor for the niobium superconducting 
                         reentrant cavities to be used in parametric transducers of the 
                         gravitational wave detector Mario Schenherg. Many cavities were 
                         manufactured from niobium with high tantalum impurities (1420 ppm) 
                         and they were cryogenically tested to determine their resonance 
                         frequencies and unloaded electrical quality factors (Qo) related 
                         to the electromagnetic coupling. These cavities were closed using 
                         a niobium cover with tantalum impurities below 1000 ppm and the 
                         unloaded electrical quality factor Qo = 2.65x105 was obtained. 
                         Another cavity similar to the one used by the Australian detector 
                         Niobe and made of niobium with low tantalum impurities was also 
                         investigated. The unloaded quality factor measured for this cavity 
                         was QIJ = 6.35xl03 The experimental tests were performed in the 
                         laboratories of the National Institute for Space Research (lNPE) 
                         and the Institute for Advanced Studies (iEAv - eTA).",
  conference-location = "Bel{\'e}m, PA",
      conference-year = "03-06 nov.",
                 isbn = "978-1-4244-5357-3",
                label = "self-archiving-INPE-MCTIC-GOV-BR",
             language = "en",
           targetfile = "furtado_high.pdf",
        urlaccessdate = "02 maio 2024"
}