Abstract
The main purpose of this work is to optimize the electricQ-factor of superconducting niobium klystron cavities to be used inparametric transducers of the Mario Schenberg gravitational wave detector.Many cavities were manufactured from niobium with relatively high tantalumimpurities (1420 ppm) and they were cryogenically tested to determine theirresonance frequencies, unloaded electrical quality factors (Q0) andelectromagnetic couplings. These cavities were closed with a flat niobiumplate with tantalum impurities below 1000 ppm and an unloaded electricalquality factors of the order of 105 have been obtained. AC conductivityof the order of 1012 S/m has been found for niobiumcavities when matching experimental results with computational simulations.These values for the Q-factor would allow the detector to reach the quantumlimit of sensitivity of ∼ 10−22 Hz−1/2 in the nearfuture, making it possible to search for gravitational waves around 3.2 kHz.The experimental tests were performed at the laboratories of the NationalInstitute for Space Research (INPE) and at the Institute for AdvancedStudies (IEAv - CTA).
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