We experimentally demonstrate the stable trapping of a permanent magnet sphere above a lead superconductor, at vacuum pressures of 4 x 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 similar to 10(-10) m/root Hz at 30.75 Hz frequency. With current experimental parameters, we find an acceleration sensitivity of S-a(1/2) = 1.2 +/- 0.2 x 10(-10) g/root Hz, for a thermal noise limited system. By considering a 300 mK environment, at a background helium pressure of 1 x 10(-10) mbar, acceleration sensitivities of S-a(1/2) similar to 3 x 10(-15) g/root Hz could be possible with ideal conditions and vibration isolation. To feasibly measure with such a sensitivity, feedback cooling must be implemented. Published under license by AIP Publishing.

Acceleration sensing with magnetically levitated oscillators above a superconductor / Timberlake, Chris; Gasbarri, Giulio; Vinante, Andrea; Setter, Ashley; Ulbricht, Hendrik. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - 115:22(2019). [10.1063/1.5129145]

Acceleration sensing with magnetically levitated oscillators above a superconductor

Vinante, Andrea;
2019-01-01

Abstract

We experimentally demonstrate the stable trapping of a permanent magnet sphere above a lead superconductor, at vacuum pressures of 4 x 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 similar to 10(-10) m/root Hz at 30.75 Hz frequency. With current experimental parameters, we find an acceleration sensitivity of S-a(1/2) = 1.2 +/- 0.2 x 10(-10) g/root Hz, for a thermal noise limited system. By considering a 300 mK environment, at a background helium pressure of 1 x 10(-10) mbar, acceleration sensitivities of S-a(1/2) similar to 3 x 10(-15) g/root Hz could be possible with ideal conditions and vibration isolation. To feasibly measure with such a sensitivity, feedback cooling must be implemented. Published under license by AIP Publishing.
2019
22
Timberlake, Chris; Gasbarri, Giulio; Vinante, Andrea; Setter, Ashley; Ulbricht, Hendrik
Acceleration sensing with magnetically levitated oscillators above a superconductor / Timberlake, Chris; Gasbarri, Giulio; Vinante, Andrea; Setter, Ashley; Ulbricht, Hendrik. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - 115:22(2019). [10.1063/1.5129145]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/343884
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