LIGO Document G1701306-v1

Comparing the low-frequency performance of maraging and glassy metal cantilever blade springs

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G - Presentations (eg Graphics)
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Virtually all cantilever blade springs used in gravitational wave detectors for seismic attenuation are made with maraging steel. Geometric anti-spring filters made from this material and designed to reach arbitrarily low resonant frequencies have shown instabilities that impede their tuning below 1⁄2 Hertz. The instability and low frequency noise can be attributed to self-organized criticality effects within the material. The suspects are avalanches of disentangling/re-entangling dislocations that randomly change the filterís equilibrium point.
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Amaldi 12 held on 09 Jul 2017 in Hilton Hotel, Pasadena, CA

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