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Thermal noise from the suspension fibres used in the mirror pendulums incurrent gravitational wave detectors is a critical noise source. Futuredetectors will require improved suspension performance with the specificability to suspend much heavier masses to reduce radiation pressure noise,whilst retaining good thermal noise performance. In this letter, we propose andexperimentally demonstrate a design for a large-scale fused silica suspension,demonstrating its suitability for holding an increased mass of 160 kg. Wedemonstrate the concepts for improving thermal noise via longer suspensionfibres supporting a higher static stress. We present a full thermal noiseanalysis of our prototype, meeting requirements for conceptual 3rd generationdetector designs such as the high frequency interferometer of the EinsteinTelescope (ET-HF), and closely approaching that required for Cosmic Explorer(CE).

Proposed large scale monolithic fused silica mirror suspension for 3rd generation gravitational wave detectors