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Self-Compensation of the Residual Field Gradient in Double-Shell Open-Ended Cylindrical Axial Magnetic Shields
- Source :
- IEEE Transactions on Magnetics. Sept, 1999, Vol. 35 Issue 5, 3943
- Publication Year :
- 1999
-
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 ~2-fold 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. Index Terms--Magnetic shielding, open-ended cylindrical shields, uniformity, self-compensation.
Details
- ISSN :
- 00189464
- Volume :
- 35
- Issue :
- 5
- Database :
- Gale General OneFile
- Journal :
- IEEE Transactions on Magnetics
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.60272940