A low-frequency torsion pendulum with interferometric readout

Ross, M. P.; Venkateswara, K.; Hagedorn, Charles; Leupold, C. J.; Forsyth, P. W. F.; Wegner, Jan Dirk; Shaw, E. A.; Lee, J. G.; Gundlach, Jens H.

doi:10.1063/5.0043098

Cited by 10 publications

(4 citation statements)

References 24 publications

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“…Torsion-Bar Antenna for Low-Frequency Gravitational-Wave bars, but they do not have sufficient sensitivity [20,23,26]. Possible candidates are improved types of wavefront sensors and differential Fabry-Pérot cavities.…”

Section: Pos(icrc2023)1584mentioning

confidence: 99%

Development of Torsion-Bar Antenna for Low-Frequency Gravitational-Wave Observation

Oshima¹,

Takano²,

Ooi³

et al. 2023

Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)

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Torsion-Bar Antenna (TOBA) is a ground-based gravitational-wave detector for low frequency. TOBA can detect intermediate-mass black hole binary mergers, gravitational wave stochastic background, and Newtonian noise. TOBA is also useful for earthquake early warning. TOBA consists of two 10-m test masses suspended horizontally and we aim to detect the torsional rotation of pendulums caused by tidal forces. The resonant frequency of torsional motion is ∼ 1 mHz, therefore TOBA has good design sensitivity of 1 × 10 −19 / √ Hz between 0.1 Hz and 10 Hz. We are currently developing the third prototype detector Phase-III TOBA with 35 cm-scale pendulums at cryogenic temperature to demonstrate noise reduction. The target sensitivity is set to 1 × 10 −15 / √ Hz. In this paper, we will present the principle and science of TOBA and the status of the development of Phase-III TOBA.

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Section: Pos(icrc2023)1584mentioning

confidence: 99%

Development of Torsion-Bar Antenna for Low-Frequency Gravitational-Wave Observation

Oshima¹,

Takano²,

Ooi³

et al. 2023

Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)

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“…To avoid stray magnetic fields influencing the torsion pendulum, the permanent magnets are surrounded by a cylindrical iron housing acting as a flux return. A system very similar to the one employed here has been described in detail elsewhere 17 .…”

Section: The Torsion Balancementioning

confidence: 99%

A Cryogenic Torsion Balance Using a Liquid-Cryogen Free, Ultra-Low Vibration Cryostat

Fleischer,

Ross,

Venkateswara

et al. 2022

Preprint

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“…A highly sensitive angular sensor is needed to read out the angle of torsion pendulums from as low as 5 × 10 −16 rad/ √ Hz. Michelson interferometers are often used as angular sensors by putting two-arm mirrors on the edge of the bars, but they do not have sufficient sensitivity [10][11][12]. Alternatively, wavefront sensors are sensitive angular sensors with optical cavities [13,14].…”

Section: Introductionmentioning

confidence: 99%

Wavefront Sensing with a Coupled Cavity for Torsion-Bar Antenna

Oshima,

Takano,

Ooi

et al. 2022

Preprint

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Torsion-Bar Antenna (TOBA) is a ground-based gravitational wave detector using torsion pendulums. TOBA can detect intermediate-mass black hole binary mergers, gravitational wave stochastic background, and Newtonian noise, and is useful for earthquake early warning. A prototype detector Phase-III TOBA with 35 cm-scale pendulums is under development to demonstrate noise reduction. The target strain sensitivity is set to 1 × 10 −15 / √ Hz between 0.1 Hz-10 Hz. A new scheme of wavefront sensing with a coupled cavity was proposed to measure the pendulum rotation as low as 5 × 10 −16 rad/ √ Hz for Phase-III TOBA. In our method, an auxiliary cavity is used to enhance the first-order Hermite-Gaussian mode in a main cavity. Experimental demonstration is ongoing to confirm the feasibility of angular signal amplification and establish a method for locking a coupled cavity. We evaluated the performance of the coupled cavity and concluded that angular signal amplification would be feasible with this sensor. The coupled cavity was successfully locked to the resonance by the Pound-Drever-Hall technique with two modulation frequencies.

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A low-frequency torsion pendulum with interferometric readout

Cited by 10 publications

References 24 publications

Development of Torsion-Bar Antenna for Low-Frequency Gravitational-Wave Observation

Development of Torsion-Bar Antenna for Low-Frequency Gravitational-Wave Observation

A Cryogenic Torsion Balance Using a Liquid-Cryogen Free, Ultra-Low Vibration Cryostat

Wavefront Sensing with a Coupled Cavity for Torsion-Bar Antenna

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