A high-performance magnetic shield with large length-to-diameter ratio

Susannah Dickerson*, Jason M. Hogan, David M.S. Johnson, Timothy Light Kovachy, Alex Sugarbaker, Sheng Wey Chiow, Mark A. Kasevich

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

22 Scopus citations

Abstract

We have demonstrated a 100-fold improvement in the magnetic field uniformity on the axis of a large aspect ratio, cylindrical, mumetal magnetic shield by reducing discontinuities in the material of the shield through the welding and re-annealing of a segmented shield. The three-layer shield reduces Earths magnetic field along an 8 m region to 420 μG (rms) in the axial direction, and 460 and 730 μG (rms) in the two transverse directions. Each cylindrical shield is a continuous welded tube which has been annealed after manufacture and degaussed in the apparatus. We present both experiments and finite element analysis that show the importance of uniform shield material for large aspect ratio shields, favoring a welded design over a segmented design. In addition, we present finite element results demonstrating the smoothing of spatial variations in the applied magnetic field by cylindrical magnetic shields. Such homogenization is a potentially useful feature for precision atom interferometric measurements.

Original languageEnglish (US)
Article number065108
JournalReview of Scientific Instruments
Volume83
Issue number6
DOIs
StatePublished - Jun 2012

ASJC Scopus subject areas

  • Instrumentation

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