@Article{PaulaFuAgOlCaBa:2014:HiSuNi,
               author = "Paula, L. A. N. De and Furtado, S{\'e}rgio Ricardo and Aguiar, 
                         Odylio Denys de and Oliveira Jr., N. F. and Castro, Pedro 
                         Jos{\'e} de and Barroso, Joaquim Jos{\'e}",
          affiliation = "Physics Department, Technological Institute of Aeronautics - ITA, 
                         Pra{\c{c}}a Marechal-do-Ar Eduardo Gomes 50S{\~a}o Jos{\'e} dos 
                         Campos, Brazil; Department of Mechanics and Material Physics, 
                         University of Sao Paulo - USP, Rua do Mat{\~a}o 187S{\~a}o 
                         Paulo, Brazil and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)} and {Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         Department of Mechanics and Material Physics, University of Sao 
                         Paulo - USP, Rua do Mat{\~a}o 187S{\~a}o Paulo, Brazil and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "High-Q superconducting niobium cavities for gravitational wave 
                         detectors",
              journal = "Journal of Instrumentation",
                 year = "2014",
               volume = "9",
               number = "10",
             keywords = "Gravitational wave detectors, Microwave systems, Niobium cavity, 
                         Optimisations, Resonant detector.",
             abstract = "The main purpose of this work is to optimize the electric Q-factor 
                         of superconducting niobium klystron cavities to be used in 
                         parametric transducers of the Mario Schenberg gravitational wave 
                         detector. Many cavities were manufactured from niobium with 
                         relatively high tantalum impurities (1420 ppm) and they were 
                         cryogenically tested to determine their resonance frequencies, 
                         unloaded electrical quality factors (Q0) and electromagnetic 
                         couplings. These cavities were closed with a flat niobium plate 
                         with tantalum impurities below 1000 ppm and an unloaded electrical 
                         quality factors of the order of 105 have been obtained. AC 
                         conductivity of the order of 1012 S/m has been found for niobium 
                         cavities when matching experimental results with computational 
                         simulations. These values for the Q-factor would allow the 
                         detector to reach the quantum limit of sensitivity of < 10-22 
                         Hz-1/2 in the near future, making it possible to search for 
                         gravitational waves around 3.2 kHz. The experimental tests were 
                         performed at the laboratories of the National Institute for Space 
                         Research (INPE) and at the Institute for Advanced Studies (IEAv - 
                         CTA).",
                  doi = "10.1088/1748-0221/9/10/P10001",
                  url = "http://dx.doi.org/10.1088/1748-0221/9/10/P10001",
                 issn = "1748-0221",
                label = "scopus 2014-11 PaulaFuAgCaBa:2014:HiSuNi",
             language = "en",
           targetfile = "1748-0221_9_10_P10001.pdf",
        urlaccessdate = "02 maio 2024"
}