A cryogenic test-mass suspension with flexures operating in compression for third-generation gravitational-wave detectors
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Arellano, Fabián E. Peña Leon, Nelson L. López, Leonardo González DeSalvo, Riccardo Themann, Harry Appavuravther, Esra Zerina Avallone, Guerino Badaracco, Francesca Barton, Mark A. Bertolini, Alessandro Chavez, Christian Damas, Andy Damas, Richard Gallego, Britney Hennes, Eric Iannone, Gerardo Linker, Seth Mondin, Marina Moreno, Claudia Pang, Kevin Selleri, Stefano Soto, Mynor Travasso, Flavio Van-Heijningen, Joris Velez, Fernando Zeoli, Morgane |
| author_facet | Arellano, Fabián E. Peña Leon, Nelson L. López, Leonardo González DeSalvo, Riccardo Themann, Harry Appavuravther, Esra Zerina Avallone, Guerino Badaracco, Francesca Barton, Mark A. Bertolini, Alessandro Chavez, Christian Damas, Andy Damas, Richard Gallego, Britney Hennes, Eric Iannone, Gerardo Linker, Seth Mondin, Marina Moreno, Claudia Pang, Kevin Selleri, Stefano Soto, Mynor Travasso, Flavio Van-Heijningen, Joris Velez, Fernando Zeoli, Morgane |
| contents | This paper presents an analysis of the conceptual design of a novel silicon suspension for the cryogenic test-mass mirrors of the low-frequency detector of the Einstein Telescope gravitational-wave observatory. In traditional suspensions, tensional stress is a severe limitation for achieving low thermal noise, safer mechanical margins and high thermal conductance simultaneously. In order to keep the tensional stress sufficiently low, we propose the use of rigid beams with large cross sections, combined with short flexures under compressional load. This configuration takes advantage of the many times higher strength of silicon in compression to respect to its strength in tension. The flexures are mechanically robust and at the same time soft in the working direction, thus producing low suspension thermal noise and, by being short, provide high thermal conductance for cryogenic cooling. The rigid beams, located between the test mass and an intermediate mass, allow the elimination of the recoil mass used conventionally for applying control forces for interferometer lock, and the use of optical anti-springs to reduce the pendulum resonant frequency to further improve the vibration isolation of the test mass. The configuration has the capability to reach a lower mirror operational temperature, which is expected to produce a substantial reduction of the thermal noise in the mirrors of the interferometer. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_19169 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A cryogenic test-mass suspension with flexures operating in compression for third-generation gravitational-wave detectors Arellano, Fabián E. Peña Leon, Nelson L. López, Leonardo González DeSalvo, Riccardo Themann, Harry Appavuravther, Esra Zerina Avallone, Guerino Badaracco, Francesca Barton, Mark A. Bertolini, Alessandro Chavez, Christian Damas, Andy Damas, Richard Gallego, Britney Hennes, Eric Iannone, Gerardo Linker, Seth Mondin, Marina Moreno, Claudia Pang, Kevin Selleri, Stefano Soto, Mynor Travasso, Flavio Van-Heijningen, Joris Velez, Fernando Zeoli, Morgane General Relativity and Quantum Cosmology Instrumentation and Methods for Astrophysics Instrumentation and Detectors This paper presents an analysis of the conceptual design of a novel silicon suspension for the cryogenic test-mass mirrors of the low-frequency detector of the Einstein Telescope gravitational-wave observatory. In traditional suspensions, tensional stress is a severe limitation for achieving low thermal noise, safer mechanical margins and high thermal conductance simultaneously. In order to keep the tensional stress sufficiently low, we propose the use of rigid beams with large cross sections, combined with short flexures under compressional load. This configuration takes advantage of the many times higher strength of silicon in compression to respect to its strength in tension. The flexures are mechanically robust and at the same time soft in the working direction, thus producing low suspension thermal noise and, by being short, provide high thermal conductance for cryogenic cooling. The rigid beams, located between the test mass and an intermediate mass, allow the elimination of the recoil mass used conventionally for applying control forces for interferometer lock, and the use of optical anti-springs to reduce the pendulum resonant frequency to further improve the vibration isolation of the test mass. The configuration has the capability to reach a lower mirror operational temperature, which is expected to produce a substantial reduction of the thermal noise in the mirrors of the interferometer. |
| title | A cryogenic test-mass suspension with flexures operating in compression for third-generation gravitational-wave detectors |
| topic | General Relativity and Quantum Cosmology Instrumentation and Methods for Astrophysics Instrumentation and Detectors |
| url | https://arxiv.org/abs/2503.19169 |