Design and characterization of a compact magnetic shield for ultracold atomic gas experiments

Year: 2019

Authors: Farolfi A., Trypogeorgos D., Colzi G., Fava E., Lamporesi G., Ferrari G.

Autors Affiliation: Univ Trento, INO CNR BEC Ctr, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, I-38123 Povo, Italy; INFN, Trento Inst Fundamental Phys & Applicat, I-38123 Povo, Italy.

Abstract: We report on the design, construction, and performance of a compact magnetic shield that facilitates a controlled, low-noise environment for experiments with ultracold atomic gases. The shield was designed to passively attenuate external slowly varying magnetic fields while allowing for ample optical access. The geometry, number of layers, and choice of materials were optimized using extensive finite-element numerical simulations. The measured performance of the shield is in good agreement with the simulations. From measurements of the spin coherence of an ultracold atomic ensemble, we demonstrate a residual field noise of 2.6 μG and a suppression of external dc magnetic fields by more than five orders of magnitude.

Journal/Review: REVIEW OF SCIENTIFIC INSTRUMENTS

Volume: 90      Pages from: 115114-1  to: 115114-6

More Information: This work was supported by the Provincia Autonoma di Trento and the Istituto Nazionale di Fisica Nucleare under the FISh project. We acknowledge received funding from the project NAQUAS of QuantERA ERA-NET Cofund in Quantum Technologies (Grant Agreement No. 731473) implemented within the European Union´s Horizon 2020 Programme.
KeyWords: Magnetic shield; finite-element analysis; magnetic materials
DOI: 10.1063/1.5119915

Citations: 29
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