Présentation du « Réseau Migrations »

Milazzo, Josepha; Pinel, Jordan; Tartakowsky, Ewa

doi:10.4000/e-migrinter.831

Cited by 1 publication

(1 citation statement)

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“…The required Newtonian noise cancellation system can be achieved with maximized effectiveness, minimized borehole length, and minimized cost by directional drilling of boreholes radiating from tunnels located near the three corners. Directional boring tech-niques developed for oil extraction and ore exploration [54] allow an optimal and easily expandable sensor geometry. Boreholes radiating from near the corner stations are sketched (in a plane) in Figure 7.…”

Section: Radial Boreholes and Newtonian Noise Subtraction Sensorsmentioning

confidence: 99%

Tunnel Configurations and Seismic Isolation Optimization in Underground Gravitational Wave Detectors

et al. 2022

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The Einstein Telescope will be a gravitational wave observatory comprising six nested detectors, three optimized to collect low-frequency signals, and three for high frequency. It will be built a few hundred meters under Earth’s surface to reduce direct seismic and Newtonian noise. A critical issue with the Einstein Telescope design are the three corner stations, each hosting at least one sensitive component of all six detectors in the same hall. Maintenance, commissioning, and upgrade activities on a detector will cause interruptions of the operation of the other five, in some cases for years, thus greatly reducing the Einstein Telescope observational duty cycle. This paper proposes a new topology that moves the recombination and input–output optics of the Michelson interferometers, the top stages of the seismic attenuation chains and noise-inducing equipment in separate excavations far from the tunnels where the test masses reside. This separation takes advantage of the shielding properties of the rock mass to allow continuing detection with most detectors even during maintenance and upgrade of others. This configuration drastically improves the observatory’s event detection efficiency. In addition, distributing the seismic attenuation chain components over multiple tunnel levels allows the use of effectively arbitrarily long seismic attenuation chains that relegate the seismic noise at frequencies farther from the present low-frequency noise budget, thus keeping the door open for future upgrades. Mechanical crowding around the test masses is eliminated allowing the use of smaller vacuum tanks and reduced cross section of excavations, which require less support measures.

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Section: Radial Boreholes and Newtonian Noise Subtraction Sensorsmentioning

confidence: 99%