A new method of probing mechanical losses of coatings at cryogenic temperatures

Abstract : A new method of probing mechanical losses and comparing the corresponding deposition processes of metallic and dielectric coatings in 1-100 MHz frequency range and cryogenic temperatures is presented. The method is based on the use of high-quality quartz acoustic cavities whose internal losses are orders of magnitude lower than any available coatings nowadays. The approach is demonstrated for Chromium, Chromium/Gold and a multilayer tantala/silica coatings. The Ta2O5/SiO2 coating has been found to exhibit a loss angle lower than 1.6 × 10 −5 near 30 MHz at 4 K. The results are compared to the previous measurements.
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Serge Galliou, Samuel Deléglise, Maxim Goryachev, Leonhard Neuhaus, Gianpietro Cagnoli, et al.. A new method of probing mechanical losses of coatings at cryogenic temperatures. Review of Scientific Instruments, American Institute of Physics, 2016, 87, pp.123906 - 123906. ⟨10.1063/1.4972106⟩. ⟨in2p3-01452279⟩

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