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Reentrant cavities as electromechanical transducers

2004; American Institute of Physics; Volume: 75; Issue: 4 Linguagem: Inglês

10.1063/1.1688438

1527-2400

Joaquim J. Barroso, Pedro J. Castro, O. D. Aguiar, L A Carneiro,

Particle Accelerators and Free-Electron Lasers

The present work quantifies the dependence of the tunable frequency range on the gap spacing between the end of the conical post and the cavity top plate in reentrant 1.0 GHz klystron cavities. Fabricated from aluminum, the cavities tested are 80 mm in diameter with a top plate 1 mm thick. Experiments performed on such cavities have shown tuning coefficients (change in resonant frequency due to variation of the capacitive gap) as high as 40.0 MHz/μm, thereby demonstrating the capability of reentrant cavities as electromechanical transducers in resonant mass gravitational wave antennas. For cavity-based transducers ten times as small as the cavities tested here, this result translates into a tuning coefficient 100 times higher.