2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/87940We study the thermal-noise spectrum of multi-loop pendulum suspensions for test masses in interferometric gravitational-wave detectors. The dependence of the thermal noise on suspension parameters and on properties of the wire material is discussed for the situation in which the losses are dominated by the internal friction in the pendulum wires.12 pages, 4 figuresInstrumentation and DetectorsGeneral Relativity and Quantum CosmologyGeneral Physicstext