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Luca D'Onofrio08/10/2026, 08:30
The low-frequency sensitivity of the Einstein Telescope depends on the seismic environment of its site, both through the mechanical coupling of ground motion to the test masses and through Newtonian noise.
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We present the first results of the seismic characterization of the Euregio Meuse-Rhine candidate site based on a network of recently instrumented boreholes covering the first seven months... -
Brieux Thibaut (Uliege)08/10/2026, 08:50
Seismic noise remains one of the principal challenges to extending the detection bandwidth of gravitational-wave detectors toward lower frequencies. As the Einstein Telescope aims to achieve unprecedented low-frequency sensitivity, the seismic isolation of its test masses must be significantly improved.
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A major difficulty in active isolation at very low frequencies arises from the strong... -
Morgane Zeoli (Université de Liège)08/10/2026, 09:10
Technology validation for the ET-LF must be conducted in an extremely low-vibration, cryogenic environment to simulate adequate operational conditions. This harsh environment calls for a highly sensitive, cryogenic-compatible inertial sensor for vibration monitoring and reduction in the test facilities. To that end, cryogenic, vacuum-compatible, horizontal and vertical inertial sensors with a...
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Francesco De Marco (Ghent University)08/10/2026, 11:00
Gravitational-wave detectors require a purely Gaussian beam in output, which ensures a smooth distribution of the optical power across the transversal plane, and the lowest angular divergence. For this reason, an Output Mode Cleaner (OMC) optical cavity is placed before the detection photodiode, to filter out the control sidebands created with phase modulation, and spurious higher-order modes...
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Daniela Pascucci (Ghent University)08/10/2026, 11:20
The Virgo gravitational-wave detector is calibrated using two independent methods: the Photon Calibrator (PCal) and Newtonian Calibrator (NCal), that can validate h(t) with an accuracy of ~1% up to 2 kHz. A new independent technique that uses scattered light as a signal for the detector calibration was recently proposed and it is planned to be installed in Virgo for its fifth observing...
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Swapnil Dhage (UCLouvain)08/10/2026, 11:40
The proposed Einstein Telescope (ET), a third generational European gravitational-wave (GW) detector, plans to extend the frequency band below 10 Hz and achieve a broadband sensitivity improvement by at least an order of magnitude over current ground-based detectors such LIGO, Virgo and KAGRA. ET will have 10 km underground interferometers in a triangular configuration with each arm consisting...
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Thomas Giordano (University of Liège)09/10/2026, 10:30
In order to reach the targeted low-frequency sensitivity of the Einstein Telescope, large cryogenic mirrors will have to be mounted on ultralow-frequency seismic isolation stages. In this context, ET-CRISTAL is developing a full-scale prototype suspending a 100 kg silicon test mass cooled to cryogenic temperatures by radiative cooling and isolated at low frequency from seismic noise. The...
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