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Abstract #3112

Magnetic fields produced by simple coils inside finite-length cylindrical passive shields with end-caps

Richard W. Bowtell1, Michael Packer 2, Peter Hobson 2, James Leggett1, Niall Holmes1, Paul Glover 1, Matthew Brookes1, and Mark Fromhold2
1Sir Peter Mansfield Imaging Centre, University of Nottingham, Nottingham, United Kingdom, 2School of Physics and Astronomy, University of Nottingham, Nottingham, United Kingdom

Cylindrical shields formed from material of high permeability are commonly used in providing low-magnetic field environments for experimental research. Cylindrical coils are often sited inside such shields to produce controlled patterns of field variation, but interaction of the coils with the mu-metal distorts the fields. Here we show how to analytically calculate the fields that are produced by simple coils inside a finite-length, cylindrical mu-metal shield with end-caps, and report experimental measurements on two different coils (loop and saddle), demonstrating excellent agreement with the theory. Optimal spacings of Helmholtz-type coils inside finite-length shields are also derived using the analytic expressions.

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