A detector of small harmonic displacements based on two coupled microwave cavities

Details A detector of small harmonic displacements based on two coupled microwave cavities A detector of small harmonic displacements based on two coupled microwave cavities

2001-03-02

arxiv.org/abs/gr-qc/0103006v2

Rev.Sci.Instrum. 72 (2001) 2428-2437

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

28 pages, 12 eps figures, ReVteX. \tightenlines command added to reduce number of pages. The following article has been accept

Scientific paper

10.1063/1.1366636

The design and test of a detector of small harmonic displacements is presented. The detector is based on the principle of the parametric conversion of power between the resonant modes of two superconducting coupled microwave cavities. The work is based on the original ideas of Bernard, Pegoraro, Picasso and Radicati, who, in 1978, suggested that superconducting coupled cavities could be used as sensitive detectors of gravitational waves, and on the work of Reece, Reiner and Melissinos, who, {in 1984}, built a detector of this kind. They showed that an harmonic modulation of the cavity length l produced an energy transfer between two modes of the cavity, provided that the frequency of the modulation was equal to the frequency difference of the two modes. They achieved a sensitivity to fractional deformations of dl/l~10^{-17} Hz^{-1/2}. We repeated the Reece, Reiner and Melissinos experiment, and with an improved experimental configuration and better cavity quality, increased the sensitivity to dl/l~10^{-20} Hz^{-1/2}. In this paper the basic principles of the device are discussed and the experimental technique is explained in detail. Possible future developments, aiming at gravitational waves detection, are also outlined.

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