This paper first presents an analytical model for calculating the shielding effectiveness of static magnetic fields using a rotating double-shell cylindrical shield with electromagnetically thin layers made of non-magnetic conducting material. Then a procedure is given for finding the optimum distance between the shells and their thickness for maximum mass reduction compared to a thick single shield for a given shielding factor.
BidinostiC.P. and MartinJ.W., Passive magnetic shielding in static gradient fields, AIP ADVANCES4 (2014), 047135.
2.
SchulzR.B.PlantzV.C. and BrushD.R., Shielding theory and practice, IEEE Transactions on Electromagnetic Compatibility30(3) (1988), 187–201.
3.
RikitakeT., Magnetic and Electromagnetic Shielding, Terra Scientific (TERRAPUB), Tokyo, Japan, 1987.
4.
BaoX.ZhangC.HuY.ChenY. and ShengZ., Combined passive shielding design of magnetic field generated by air-core reactor of power supply of EAST poloidal field, International Journal of Applied Electromagnetics and Mechanics54(3) (2017), 289–299.
5.
van HelvoortM.J.A.M. and HarbertsD.W., Low-frequency electromagnetic shielding and scattering of multiple cylindrical shells, IEEE Transactions on Electromagnetic Compatibility63 (2021), 46–56.
6.
PapernoE.PeliwalS.RomalisM.V. and PlotkinA., Optimum shell separation for closed axial cylindrical magnetic shields, Journal of Applied Physics97 (2005), 10Q104.
7.
YashchukV.LeeS. and PapernoE., Magnetic shielding, in: Optical MagnetometryBudkerD. and Jackson KimballD. (eds), Cambridge, 2013, pp. 225–248.
8.
AshkinM., A theoretical analysis of finite-length electromagnetic shields of superconducting turbine generators, IEEE Trans. Power Apparatus and Systems100 (1981), 1049–1057.
9.
DagalkisN. and Kirtley Jr.J.L., Protection of superconducting field winding for electrical machines by the use of an inertial free electromechanical shields, IEEE Trans. Magn.11 (1975), 650–652.
10.
ZiolkowskiM. and GratkowskiS., Shielding from external magnetic fields by rotating nonmagnetic conducting cylindrical shells, IEEE Transactions on Electromagnetic Compatibility51 (2009), 720–724.
11.
GratkowskiS. and ZiolkowskiM., Simple analytical models of an electromagnetically thin nonmagnetic conducting cylindrical shell rotating in external, static, and slowly time-varying magnetic fields, IEEE Transactions on Electromagnetic Compatibility62 (2020), 2325–2329.
12.
COMSOL Multiphysics® v. 5.6. www.comsol.com. COMSOL AB, Stockholm, Sweden, 2021.
