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

de Wit, Martin; Welker, Gesa; Heeck, Kier; Buters, Frank M.; Eerkens, Hedwig J.; Koning, Gert; van der Meer, Harmen; Bouwmeester, Dirk; Oosterkamp, Tjerk H.

doi:10.1063/1.5066618

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

Oct 16, 2018

Published in:

Rev.Sci.Instrum. 90 (2019) 1, 015112

Published: Jan 23, 2019

e-Print:

1810.06847 [physics.app-ph]

DOI:

10.1063/1.5066618 (publication)

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Abstract: (AIP)

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.

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