Transducers for the Brazilian gravitational wave detector ‘Mario Schenberg’

Abstract

‘Mario Schenberg’ is a spherical resonant-mass gravitational wave (GW) detector that will be part of a GW detection array of three detectors. The other two will be built in Italy and the Netherlands. Their resonant frequencies will be around 3.2 kHz with a bandwidth of about 200 Hz. This range of frequencies is new in a field where the typical frequencies lie below 1 kHz, making the transducer development much more complex. In this paper, the design of the mechanical part of the transducer will be shown, as well as the attachment method to the sphere and the expected sensitivity.

Concepts and research for future detectors

“…A spherical gravitational wave (GW) detector has a heavy ball-shaped mass which vibrates when a GW passes through it. Such motion is monitored by transducers [28].…”

Progress and challenges in advanced ground-based gravitational-wave detectors

“…Its center operation frequency is 3,200 Hz. Transducers [39] located on the surface of resonant sphere, following a half dodecahedron distribution, are used to monitor the sphere surface displacement amplitude. The development of mechanical impedance matchers for coupling the transducers to the sphere in the Mario Schenberg detector is challenging due, to a large extent, on its reduced size.…”

Summary talk on Cosmology and Gravitation XXII Brazilian National Meeting on Particles and fields

“…Topological defects in the context of (or related to) condensed matter were discussed in two posters: one by C.A.L. Ribeiro [47,48]).…”