Vibrational noise characterization of a Dry Dilution Refrigerator for low noise experiments 

Low-noise cryogenic environments are crucial for operating sensitive quantum devices. While pulse tube based dilution refrigerators offer ease of operation and reduced costs, they do so with increased vibrational noise. The Maybell dilution refrigerator implements vibration isolators and an internal suspension system designed to mitigate this vibrational noise. In this project, we characterize the vibrational noise of the Maybell refrigerator using several different piezoelectric accelerometers at varying locations and temperatures within the system. Measurements are taken with the accelerometers aligned and misaligned with the pulse tube. We provide a detailed description of the sensor thermalization, measurement procedure, and the low-noise signal conditioning and readout electronics employed. The collected vibration data are analyzed to determine the spectral noise characteristics and are cross-correlated with magnetic noise measurements. Through this cross-correlation and spectral noise analysis, we aim to understand the magnitude of the vibrational noise at all three axes and extrapolate these results to a large frequency range.