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Gravitational wave detectors, such as KAGRA, require complex mirrorsuspension systems to reach high sensitivity. One particular concern in thesesuspensions is the presence of crackling noise, where motion of the steelcrystal structure disturbs material defects, causing impulse force release andexciting mirror motion. Crackling in the Geometric Anti Spring filters (GAS) inKAGRA's suspension system could introduce noise in the gravitational wavedetection band. We investigate crackling noise in a miniature GAS with alow-frequency cyclical stress. We developed a scaling law between miniature andKAGRA GAS. Applying experimental results to the scaling law allows us toestimate the upper limit of crackling noise in KAGRA. It is found thatcrackling noise should be below the target sensitivity for gravitational wavesabove 60 Hz.

Investigation of crackling noise in the vibration isolation systems of the KAGRA gravitational wave detector