Vibration decoupling system for massive bolometers in dry cryostats

Abstract

Pulse-tube based dilution refrigerators are massively employed in low temperature physics. They allow to reduce the running costs and to be operated with unprecedented easiness. However, the main drawback of this technology is the mechanical vibrations induced by the pulse-tube cryocooler. These perturbations can cause extra-noises drastically affecting the detector performance. In this paper, we propose a solution to mitigate the impact of these vibrations by mounting the detectors in an elastic-pendulum based suspended tower. Based on vibration modeling and experimental tests, we show that the vibration levels are attenuated by up to two orders of magnitude at most frequencies, especially above $\sim 20$ Hz, for both vertical and radial directions. Thanks to this passive isolation solution, vibration levels, both along vertical and radial directions, below 1 $\mu \text{g/}\sqrt{\text{Hz}}$ in the frequency range [1-1000] Hz are obtained. This provides a convenient environment to test the ultimate performance of low temperature detectors. As a result, we report an improvement by one to two orders of magnitude on the noise levels of massive cryogenic bolometers, leading to thermal energy resolutions improved by a factor 5 to 40. Finally, we conclude that the energy resolution of our cryogenic bolometers are no longer limited from any residual vibrations, hence allowing the perspective of further improving our bolometer performance in the context of low-mass dark matter searches and neutrino physics applications.

References in corpus (8)

• Development of ${}^{100}$Mo-containing scintillating bolometers for a high-sensitivity neutrinoless double-beta decay search
• Coherent Neutrino Scattering with Low Temperature Bolometers at Chooz Reactor Complex
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• Vibrations on pulse tube based Dry Dilution Refrigerators for low noise measurements
• Atomic resolution STM in a cryogen free dilution refrigerator at 15 mK
• Optimizing EDELWEISS detectors for low-mass WIMP searches
• Design of a scanning gate microscope in a cryogen-free dilution refrigerator
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• QUBIC IV: Performance of TES Bolometers and Readout Electronics
• Piezospectroscopic measurement of high-frequency vibrations in a pulse-tube cryostat
• Final results of CALDER: Kinetic inductance light detectors to search for rare events
• Contact-less phonon detection with massive cryogenic absorbers
• Improvement of contact-less KID design using multilayered Al/Ti material for resonator
• Isolation solution for extreme environmental vibrations for quantum-enabling cryogenic setups installed on raised frames
• Limits to the sensitivity of a rare-earth-enabled cryogenic vibration sensor
• Vibrational sensing at mK temperatures in dry dilution refrigerators using commercial accelerometers for diverse fundamental physics applications