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Cryogen-free dilution refrigerators generally simplify low temperatureresearch but some types of samples, including superconducting qubits and othernanoelectronic devices, are affected by environmental heat sources such asstray photons or residual helium. We present the design and performance of ahermetic cell installed on the mixing chamber plate of a cryogen-free dilutionrefrigerator. The performance was quantified by measuring the dependence of theresonance frequency of a mechanical oscillator installed inside the cell on themixing chamber temperature down to 10 mK. We found the expected logarithmictemperature dependence of the resonance frequency down to the lowesttemperatures, demonstrating that the efficiency of the hermetic shield issignificantly better than that of a simpler shield with no visible gaps.

A 10 mK hermetic cell for eliminating parasitic heating in cryogen-free dilution refrigerators