Feasibility of a magnetic suspension for second generation gravitational wave interferometers

Varvella, M.; Calloni, E.; Fiore, L. Di; Milano, L.; Arnaud, N.

doi:10.1016/j.astropartphys.2004.01.002

Cited by 10 publications

(5 citation statements)

References 8 publications

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“…Rather than directly levitating the mirror, the magnetic suspension could be used to support an upper stage of a multistage suspension system (Varvella et al, 2004). The mirror could then be supported from this magnetically levitated platform by a passive mechanical suspension.…”

Section: Electromagnetic Suspensionsmentioning

confidence: 99%

Gravitational radiation detection with laser interferometry

2014

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Gravitational-wave detection has been pursued relentlessly for over 40 years. With the imminent operation of a new generation of laser interferometers, it is expected that detections will become a common occurrence. The research into more ambitious detectors promises to allow the field to move beyond detection and into the realm of precision science using gravitational radiation. In this article, the state of art for the detectors is reviewed and an outlook for the coming decades is described.

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Section: Electromagnetic Suspensionsmentioning

confidence: 99%

Gravitational radiation detection with laser interferometry

2014

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“…In a magnetic or magnetically assisted suspension [40][41][42], the thermal noise may not come only from the restoring force of the suspension, but also from the deformation of the suspension element which counters the force of gravity. Magnetic suspensions may also have losses due to magnetostriction in the support magnets, and eddy current damping in conductive suspension components.…”

Section: Magneto-mechanical Suspensionmentioning

confidence: 99%

Low-frequency terrestrial gravitational-wave detectors

et al. 2013

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Direct detection of gravitational radiation in the audio band is being pursued with a network of kilometer-scale interferometers (LIGO, Virgo, KAGRA). Several space missions (LISA, DECIGO, BBO) have been proposed to search for sub-Hz radiation from massive astrophysical sources. Here we examine the potential sensitivity of three ground-based detector concepts aimed at radiation in the 0.1 -10 Hz band. We describe the plethora of potential astrophysical sources in this band and make estimates for their event rates and thereby, the sensitivity requirements for these detectors. The scientific payoff from measuring astrophysical gravitational waves in this frequency band is great. Although we find no fundamental limits to the detector sensitivity in this band, the remaining technical limits will be extremely challenging to overcome.

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“…Significant experimental challenges must be overcome to realize a working MAGPI. While our proposal (and TOBA [11]) utilize the natural resonant frequency of a torsion pendulum, other designs seek to achieve low resonant suspensions using magnetic levitation controlled via active feedback [24,25]. Because of the large magnetic fields required for magnetic levitation, eddy current dissipation is an important design challenge for any scheme using magnets.…”

Section: Discussionmentioning

confidence: 99%

Suspending test masses in terrestrial millihertz gravitational-wave detectors: a case study with a magnetic assisted torsion pendulum

Thrane

Anderson

Levin

et al. 2017

Class. Quantum Grav.

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Current terrestrial gravitational-wave detectors operate at frequencies above 10 Hz. There is strong astrophysical motivation to construct low-frequency gravitational-wave detectors capable of observing 10 mHz-10 Hz signals. While space-based detectors provide one means of achieving this end, one may also consider terretrial detectors. However, there are numerous technological challenges. In particular, it is difficult to isolate test masses so that they are both seismically isolated and freely falling under the influence of gravity at millihertz frequencies. We investigate the challenges of low-frequency suspension in a hypothetical terrestrial detector. As a case study, we consider a Magnetically Assisted Gravitational-wave Pendulum Intorsion (MAGPI) suspension design. We construct a noise budget to estimate some of the required specifications. In doing so, we identify what are likely to be a number of generic limiting noise sources for terrestrial millihertz gravitational-wave suspension systems (as well as some peculiar to the MAGPI design). We highlight significant experimental challenges in order to argue that the development of millihertz suspensions will be a daunting task. Any system that relies on magnets faces even greater challenges. Entirely mechanical designs such as Zöllner pendulums may provide the best path forward.

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Feasibility of a magnetic suspension for second generation gravitational wave interferometers

Cited by 10 publications

References 8 publications

Gravitational radiation detection with laser interferometry

Gravitational radiation detection with laser interferometry

Low-frequency terrestrial gravitational-wave detectors

Suspending test masses in terrestrial millihertz gravitational-wave detectors: a case study with a magnetic assisted torsion pendulum

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