Vibration spectrum of a low-vibration pulse-tube cryostat from 1 Hz to 20 kHz

Published

January 11, 2010

Author(s)

Akobuije D. Chijioke, John R. Lawall

Abstract

The vibrations of the cold finger of a low-vibration helium pulse-tube cryostat are measured from 1 Hz to 20 kHz using an optical interferometer specially designed to measure small vibrations at high frequencies in the presence of large vibrations at lower frequencies. While the vibrational amplitude is dominated by the contribution at the fundamental compressor frequency of 1.4 Hz, the pulse tube contributes mechanical noise to frequencies up to 15 kHz, where the spectral density is measured to be 4e-12 m/sqrt(Hz) . Root-mean-squared vibration amplitudes of 5.2 micrometers and 3 micrometers are measured along perpendicular axes in the horizontal plane, and 1.0 micrometers in the vertical direction. The effect of a simple suspension for the purpose of attenuating high-frequency vibrations is evaluated. Finally, the cryostat is shown to be considerably noisier than typical laboratory floors.

Citation

Cryogenics

Volume

50

Pub Type

Journals

Download Paper

https://doi.org/10.1016/j.cryogenics.2010.01.005

Local Download

Keywords

cryogenic, pulse tube, vibration

Citation

Chijioke, A. and Lawall, J. (2010), Vibration spectrum of a low-vibration pulse-tube cryostat from 1 Hz to 20 kHz, Cryogenics, [online], https://doi.org/10.1016/j.cryogenics.2010.01.005, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=842610 (Accessed April 20, 2025)