%0 Conference Proceedings
%3 furtado_high.pdf
%@mirrorrepository sid.inpe.br/mtc-m19@80/2009/08.21.17.02.53
%4 sid.inpe.br/mtc-m19@80/2010/01.21.00.07
%8 03-06 nov.
%A Furtado, Sérgio Ricardo,
%A Aguiar, Odylio Denys de,
%A Castro, Pedro José,
%A Barroso de Castro, Joaquim José,
%B SBMO International Microwave and Optoelectronics Conference.
%@secondarytype PRE CI
%C Belém, PA
%D 2009
%F self-archiving-INPE-MCTIC-GOV-BR
%@secondarykey INPE--PRE/
%K klystron cavity, superconducting niobium, parametric transducer, gravitational wave detector.
%S Proceedings
%T High-Q niobium klystron cavities for use in gravitational wave detectors
%X 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).
%@area FISPLASMA
%@electronicmailaddress sergio@das.inpe.br
%@electronicmailaddress odylio@das.inpe.br
%@electronicmailaddress castro@plasma.inpe.br
%@electronicmailaddress barroso@plasma.inpe.br
%@documentstage not transferred
%@group DAS-CEA-INPE-MCT-BR
%@group LAP-CTE-INPE-MCT-BR
%@group LAP-CTE-INPE-MCT-BR
%@group LAP-CTE-INPE-MCT-BR
%@dissemination IEEEXplore
%@usergroup marciana
%@usergroup simone
%@usergroup administrator
%@isbn 978-1-4244-5357-3
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@nexthigherunit 8JMKD3MGPCW/3ET2RFS
%@nexthigherunit 8JMKD3MGPCW/3ETR8EH
%@versiontype publisher
%@holdercode {isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S}
%2 sid.inpe.br/mtc-m19@80/2010/01.21.00.07.58