Vibration isolation with high thermal conductance for a cryogen-free dilution refrigerator

Autor: F. M. Buters, Dirk Bouwmeester, Harmen van der Meer, Gert Koning, Kier Heeck, Martin de Wit, H. J. Eerkens, Gesa Welker, Tjerk H. Oosterkamp
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Review of Scientific Instruments, 90, 015112
Popis: We present the design and implementation of a mechanical low-pass filter vibration isolation used to reduce the vibrational noise in a cryogen-free dilution refrigerator operated at 10 mK, intended for scanning probe techniques. We discuss the design guidelines necessary to meet the competing requirements of having a low mechanical stiffness in combination with a high thermal conductance. We demonstrate the effectiveness of our approach by measuring the vibrational noise levels of an ultrasoft mechanical resonator positioned above a superconducting quantum interference device. Starting from a cryostat base temperature of 8 mK, the vibration isolation can be cooled to 10.5 mK, with a cooling power of 113 µW at 100 mK. We use the low vibrations and low temperature to demonstrate an effective cantilever temperature of less than 20 mK. This results in a force sensitivity of less than 500 zN/Hz and an integrated frequency noise as low as 0.4 mHz in a 1 Hz measurement bandwidth.
Databáze: OpenAIRE