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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

High-Q superconducting niobium cavities for gravitational wave detectors

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de Paula, L. A. N. [1, 2] ; Furtado, S. R. [3] ; Aguiar, O. D. [3] ; Oliveira, Jr., N. F. [1] ; Castro, P. J. [4] ; Barroso, J. J. [4]
Total Authors: 6
[1] Univ Sao Paulo, Dept Mech & Mat Phys, BR-09500900 Sao Paulo - Brazil
[2] Technol Inst Aeronaut ITA, Phys Dept, Sao Jose Dos Campos - Brazil
[3] Natl Inst Space Res INPE, Astrophys Div, Sao Jose Dos Campos - Brazil
[4] Natl Inst Space Res INPE, Associated Plasma Lab, Sao Jose Dos Campos - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Journal of Instrumentation; v. 9, OCT 2014.
Web of Science Citations: 3

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 (Q(0)) 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 10(5) have been obtained. AC conductivity of the order of 10(12) 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 similar to 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). (AU)