Gravitational-wave detector realized by a superconductor

K. Ishidoshiro, M. Ando, A. Takamori, K. Okada, K. Tsubono

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


In this article, we present a new gravitational-wave detector based on superconducting magnetic levitation and results of its prototype test. Our detector is composed of the suspended test mass that is rotated by gravitational waves. Gravitational wave signals are readout by monitoring its angular motion. Superconducting magnetic levitation is used for the suspension of the test mass, since it has many advantages, such as zero mechanical loss and resonant frequency around its suspension axis in an ideal situation. For the study of actual performance of such gravitational-wave detector, a prototype detector has been developed. Using the prototype detector, the actual loss factor and resonant frequency are measured as 1.2 x 108 Nms/rad and 5 mHz respectively. A detector noise is also evaluated. The current noise level is determined by the magnetic coupling with external magnetic field and mechanical coupling between translation and angular motion. The prototype detector has already one of the lowest noise levels for gravitational waves at 0.1 Hz among current gravitational-wave detectors. We have succeeded at the demonstration of the advantages of our torsion gravitational-wave detector.

Original languageEnglish
Pages (from-to)1841-1844
Number of pages4
JournalPhysica C: Superconductivity and its applications
Issue number20
Publication statusPublished - 2010 Nov 1
Externally publishedYes


  • Gravitational wave
  • Magnetic levitation
  • Torsion pendulum

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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