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Tests with superconducting re-entrant cavities for transducer applications in gravitational wave detectors

2004; IOP Publishing; Volume: 21; Issue: 5 Linguagem: Inglês

10.1088/0264-9381/21/5/124

1361-6382

K L Ribeiro, Odylio D. Aguiar, S R Furtado, Carlos Frajuca, Pedro J. Castro, Joaquim J. Barroso, M. Rémy,

Pulsars and Gravitational Waves Research

We studied the niobium re-entrant cavity utilized by the Australian group in the Niobe gravitational wave detector. Instead of using their non-contact re-entrant cavity, we plan to change it to a closed one to be used in the parametric transducers of the Brazilian Mario Schenberg detector. The performance of the transducer depends on some cavity parameters such as the electrical Q and the electrical coupling. We measured the resonant frequency and the loaded electrical Q as a function of the probe position in a closed niobium ~15 GHz cavity operating at 4.2 K.