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@Article{OliveiraAASMFLSBS:2019:SuTrNi,
               author = "Oliveira, Rog{\'e}rio de Moraes and Aguiar, Odylio Denys de and 
                         Ara{\'u}jo, Michel Felipe Lima de Ara{\'u}jo and Silva, Matheus 
                         Moraes Novaes Ferreira da and Mello, Carina Barros and Ferreira, 
                         Elvis Camilo and Liccardo, Vincenzo and Savonov, Graziela da Silva 
                         and Baba, Koumei and Souza, Renata Lopes Gon{\c{c}}alves de",
          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)} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)} and {Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {Instituto Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)} and {Sanno Co 
                         Ltda} and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "The surface treatment of niobium superconducting reentrant 
                         cavities by means of high temperature nitrogen plasma based ion 
                         implantation",
              journal = "Materials Research-Ibero-american Journal of Materials",
                 year = "2019",
               volume = "22",
               number = "6",
                pages = "e20190277",
             keywords = "Niobium, superconducting resonant cavities, plasma ion 
                         implantation, gravitational wave detector.",
             abstract = "High Temperature Nitrogen Plasma Based Ion Implantation (HT-NPBII) 
                         has been used to treat the surface of niobium superconducting 
                         reentrant cavities, which are part of parametric transducers in a 
                         resonant-mass gravitational wave detector. The aim is to enhance 
                         the corresponding electrical quality factors (Q-factors) which are 
                         closely related with the increase of the sensitivity of the 
                         system. In this experiment, the cavities are immersed in plasma 
                         and bombarded by energetic nitrogen ions, which are implanted into 
                         the surfaces of these heated substrates. The heating temperature 
                         of the cavities is controlled during the treatment and its level 
                         directly affects the N implantation depth profile due to the 
                         diffusion process. Additional tailoring of the nitrogen doping can 
                         be performed by the adjustment of the intensity and the duty cycle 
                         of the high negative voltage pulses used for ion implantation. For 
                         implantations performed at 5 kV /20 \μs /300 Hz/ 700 C, 
                         nitrogen atoms occupy interstitial spaces in the crystal lattice 
                         of niobium. The treatment of niobium superconducting cavities 
                         under these parameters caused the enhancement of two orders of 
                         magnitude of respective Q-factors. A set of characterization 
                         techniques was performed herein in order to help with the 
                         understanding of the underlying mechanism behind this 
                         phenomenon.",
                  doi = "10.1590/1980-5373-MR-2019-0277",
                  url = "http://dx.doi.org/10.1590/1980-5373-MR-2019-0277",
                 issn = "1516-1439",
                label = "lattes: 7698697775899601 1 OliveiraAASMFLBS:2019:SuTrNi",
             language = "pt",
           targetfile = "Oliveira_surface.pdf",
        urlaccessdate = "31 out. 2020"
}


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