TY - GEN
T1 - Experimental correction of the axial shielding equation
AU - Paperno, E.
AU - Sasada, I.
AU - Tashiro, K.
N1 - Publisher Copyright:
©2002 IEEE.
PY - 2002/1/1
Y1 - 2002/1/1
N2 - Analytical descriptions of axial shielding for cylindrical shields (neglecting the effect of the openings or caps) is based on the assumption that the field reduction inside the shield is due to the demagnetizing field within the equivalent ellipsoid: Sax = 1 + Nell μav = 1 + 4 Nell μt/D (equation 1), where Sax is the axial shielding factor, Nell is the demagnetizing factor of the equivalent ellipsoid, μav is the average permeability of the shield (the permeability that is averaged over the shield's cross-sectional area, μav = 4μt/D), μ is the permeability and t/D is the thickness-to-diameter ratio of the shield. Equation (1) shows some discrepancy; it seems more reasonable to replace the Nell in (1) by the demagnetizing factor of the equivalent rod, Nrod, because the shields analyzed have the same outer surface as the rod does. In order to support the above idea experimentally, we built and investigated ten cylindrical shields with L/D ratios from 1 to 8.3. The results obtained show that the employment of the Nrod in (1) provides much better agreement between the experimental and analytical results.
AB - Analytical descriptions of axial shielding for cylindrical shields (neglecting the effect of the openings or caps) is based on the assumption that the field reduction inside the shield is due to the demagnetizing field within the equivalent ellipsoid: Sax = 1 + Nell μav = 1 + 4 Nell μt/D (equation 1), where Sax is the axial shielding factor, Nell is the demagnetizing factor of the equivalent ellipsoid, μav is the average permeability of the shield (the permeability that is averaged over the shield's cross-sectional area, μav = 4μt/D), μ is the permeability and t/D is the thickness-to-diameter ratio of the shield. Equation (1) shows some discrepancy; it seems more reasonable to replace the Nell in (1) by the demagnetizing factor of the equivalent rod, Nrod, because the shields analyzed have the same outer surface as the rod does. In order to support the above idea experimentally, we built and investigated ten cylindrical shields with L/D ratios from 1 to 8.3. The results obtained show that the employment of the Nrod in (1) provides much better agreement between the experimental and analytical results.
UR - http://www.scopus.com/inward/record.url?scp=85017273557&partnerID=8YFLogxK
U2 - 10.1109/INTMAG.2002.1001223
DO - 10.1109/INTMAG.2002.1001223
M3 - Conference contribution
AN - SCOPUS:85017273557
T3 - INTERMAG Europe 2002 - IEEE International Magnetics Conference
BT - INTERMAG Europe 2002 - IEEE International Magnetics Conference
A2 - Fidler, J.
A2 - Hillebrands, B.
A2 - Ross, C.
A2 - Weller, D.
A2 - Folks, L.
A2 - Hill, E.
A2 - Vazquez Villalabeitia, M.
A2 - Bain, J. A.
A2 - De Boeck, Jo
A2 - Wood, R.
PB - Institute of Electrical and Electronics Engineers
T2 - 2002 IEEE International Magnetics Conference, INTERMAG Europe 2002
Y2 - 28 April 2002 through 2 May 2002
ER -