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Acceleration sensing with magnetically levitated oscillators above a superconductor

Acceleration sensing with magnetically levitated oscillators above a superconductor
Acceleration sensing with magnetically levitated oscillators above a superconductor
We experimentally demonstrate stable trapping of a permanent magnet sphere above a lead superconductor, in vacuum pressures of 4×10−8 mbar. The levitating magnet behaves as a harmonic oscillator, with frequencies in the 4-31 Hz range detected, and shows promise to be an ultrasensitive acceleration sensor. We directly apply an acceleration to the magnet with a current carrying wire, which we use to measure a background noise of ∼ 10−10 m/ √ Hz at 30.75 Hz frequency. With current experimental parameters, we find an acceleration sensitivity of S 1/2 a = 1.2 ± 0.2 × 10−10 g/ √ Hz, for a thermal noise limited system. By considering a 300 mK
environment, at a background helium pressure of 1 × 10−10 mbar, acceleration sensitivities of S 1/2 a ∼ 3 × 10−15 g/
√ Hz could be possible with ideal conditions and vibration isolation. To feasibly measure with such a sensitivity, feedback cooling must be implemented.
0003-6951
Timberlake, Christopher
0389857f-3bb0-4e90-96f0-363591417d50
Gasbarri, Giulio
1f6df418-5a22-4ec4-b24e-68aa10e0a684
Vinante, Andrea
f023d600-0537-41c4-b307-bf9cdfc1f56c
Setter, Ashley
cd66c5c7-86d8-40bd-b964-85daedbc04d0
Ulbricht, Hendrik
5060dd43-2dc1-47f8-9339-c1a26719527d
Timberlake, Christopher
0389857f-3bb0-4e90-96f0-363591417d50
Gasbarri, Giulio
1f6df418-5a22-4ec4-b24e-68aa10e0a684
Vinante, Andrea
f023d600-0537-41c4-b307-bf9cdfc1f56c
Setter, Ashley
cd66c5c7-86d8-40bd-b964-85daedbc04d0
Ulbricht, Hendrik
5060dd43-2dc1-47f8-9339-c1a26719527d

Timberlake, Christopher, Gasbarri, Giulio, Vinante, Andrea, Setter, Ashley and Ulbricht, Hendrik (2019) Acceleration sensing with magnetically levitated oscillators above a superconductor. Applied Physics Letters, 115 (22), [224101]. (doi:10.1063/1.5129145).

Record type: Article

Abstract

We experimentally demonstrate stable trapping of a permanent magnet sphere above a lead superconductor, in vacuum pressures of 4×10−8 mbar. The levitating magnet behaves as a harmonic oscillator, with frequencies in the 4-31 Hz range detected, and shows promise to be an ultrasensitive acceleration sensor. We directly apply an acceleration to the magnet with a current carrying wire, which we use to measure a background noise of ∼ 10−10 m/ √ Hz at 30.75 Hz frequency. With current experimental parameters, we find an acceleration sensitivity of S 1/2 a = 1.2 ± 0.2 × 10−10 g/ √ Hz, for a thermal noise limited system. By considering a 300 mK
environment, at a background helium pressure of 1 × 10−10 mbar, acceleration sensitivities of S 1/2 a ∼ 3 × 10−15 g/
√ Hz could be possible with ideal conditions and vibration isolation. To feasibly measure with such a sensitivity, feedback cooling must be implemented.

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Accepted/In Press date: 16 November 2019
e-pub ahead of print date: 26 November 2019

Identifiers

Local EPrints ID: 436025
URI: http://eprints.soton.ac.uk/id/eprint/436025
ISSN: 0003-6951
PURE UUID: 686afed2-64be-4a80-a63c-37335067210b
ORCID for Andrea Vinante: ORCID iD orcid.org/0000-0002-9385-2127

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Date deposited: 26 Nov 2019 17:30
Last modified: 06 Oct 2020 17:10

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