Self-compensation of the residual field gradient in double-shell open-ended cylindrical axial magnetic shields

E. Paperno, I. Sasada, H. Naka

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Abstract

An important and not-obvious demonstration' made in this work Is that replacing a closed double-shell axial cylindrical shield with a similar but open-ended shield can lead to an increasing in not only the axial shielding factor, but in the residual magnetic field uniformity as well. It is shown that a self-compensation of the residual field gradient and a significant improvement of the total residual field uniformity are potentially possible, by combining two open-ended cylindrical shells having different length-to-diameter ratios and providing opposite signs and appropriate magnitudes of the residual field gradients. A numerical example confirms the applicability of the method. It is shown that an -6-fold reduction of the residual field gradient along the axial direction and an ~2fold reduction of that along the radial direction over a relatively wide area inside a double-shell cylindrical axial shield are possible if its both ends are open.

Original languageEnglish
Pages (from-to)3943-3945
Number of pages3
JournalIEEE Transactions on Magnetics
Volume35
Issue number5 PART 2
DOIs
Publication statusPublished - Dec 1 1999

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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