High quality factor measured in fused silica

Details High quality factor measured in fused silica High quality factor measured in fused silica

2000-09-11

arxiv.org/abs/gr-qc/0009035v1

Rev.Sci.Instrum. 72 (2001) 3670-3673

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Preprint - Under review by LSC publications committee

Scientific paper

10.1063/1.1394183

We have measured the mechanical dissipation in a sample of fused silica drawn into a rod. The sample was hung from a multiple-bob suspension, which isolated it from rubbing against its support, from recoil in the support structure, and from seismic noise. The quality factor, Q, was measured for several modes with a high value of 57 million found for mode number 2 at 726 Hz. This result is about a factor 2 higher than previous room temperature measurements. The measured Q was strongly dependent on handling, with a pristine flame-polished surface yielding a Q 3-4 times higher than a surface which had been knocked several times against a copper tube.

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