Coil Shape Optimization of Magnetic-Shielding-type Transverse Field Gradient Coils with Eddy Shapes

1994 ◽  
Vol 114 (10) ◽  
pp. 694-700
Author(s):  
Takao Takahashi
Keyword(s):  
Shape Optimization ◽  
Field Gradient ◽  
Transverse Field ◽  
Magnetic Shielding ◽  
Gradient Coils ◽  
Coil Shape

scholarly journals Vector Magnetic Fields at the Base of Filaments and the Filament Environment

1998 ◽  
Vol 167 ◽  
pp. 98-101 ◽  
Author(s):  
Jingxiu Wang ◽  
Wei Li
Keyword(s):  
Magnetic Fields ◽  
Magnetic Structure ◽  
Field Gradient ◽  
Neutral Line ◽  
Transverse Field ◽  
Line Of Sight ◽  
Horizontal Gradient ◽  
Major Fraction ◽  
Flux System ◽  
Magnetic Neutral Line

AbstractBased on an analysis of three active filaments in AR 6891, we find that vector magnetic fields at the base of filaments and the filament environment is characterized by the following: (1) The transverse field is parallel along the magnetic neutral line for most of the filaments. The average transverse field beneath the filaments is more than 400 G. (2) The horizontal gradient of the line-of-sight field crossing the neutral line is, more or less, constant along the major fraction of a filament, but very steep at the two ends. The average gradient is 0.06 G/km. (3) For each of the filaments there is a squeezing magnetic structure which represents an intrusion of a satellite bipole into the main flux system. The neutral line for a squeezing magnetic structure has a large curvature, a strong sheared transverse field of more than 1 KG, and a steep field gradient of approximate 0.3 G/km. (4) The transverse field and field gradient are clearly enhanced before the filament eruption.

scholarly journals On Superposed Magnetic Inductions in Iron

1904 ◽  
Vol 24 ◽  
pp. 312-313
Author(s):  
James Russell
Keyword(s):  
Magnetic Induction ◽  
Early Stage ◽  
Transverse Field ◽  
Magnetic Shielding ◽  
The Subject

A communication was made to this Society on February 3, 1902, on ‘Magnetic Shielding in ollow Iron Cylinders.’ At an early stage of this investigation, and when dealing with more magnetising forces than that due to the transverse field acting upon the shield, the subject of cross magnetisation necessarily came to the front. This paper deals, First, with the superposition of two magnetising forces at right angles to each other, and the coordination of the two components of the resultant magnetic induction, under the various conditions of field superposition; and Second, with the magnetic œolotropy of demagnetised iron. The same hollow iron cylinders were used as in the shielding experiments.

DENSITY FUNCTIONAL THEORY STUDY OF BINDING ENERGIES, 7Li NUCLEAR MAGNETIC SHIELDING, AND ELECTRIC FIELD GRADIENT TENSORS ON THE SMALL CLUSTERS OF LinHm (m ≤ n ≤ 4)

2007 ◽  
Vol 06 (04) ◽  
pp. 959-973 ◽  
Author(s):  
MEHDI D. ESRAFILI ◽  
FATEMEH ELMI ◽  
NASSER L. HADIPOUR
Keyword(s):  
Density Functional Theory ◽  
Electric Field ◽  
Electric Field Gradient ◽  
Field Gradient ◽  
Density Functional ◽  
Three Dimensional ◽  
Lithium Hydride ◽  
Binding Energies ◽  
Magnetic Shielding ◽  
Functional Theory

The binding energies, geometries, 7 Li magnetic shielding, and electric field gradient tensors of hydrogenated lithium clusters, Li n H m (m ≤ n ≤ 4), were studied via density functional theory approach. We optimized the structures using B3LYP functional and 6-311++G (2d,2p) basis set. The calculated binding energies of lithium hydride clusters indicate that hydrogenation energy of Li n H m clusters decreases as the number of hydrogen atoms within the cluster increases. Our calculations also showed that for n = 4 clusters, the three-dimensional structure is more stable than the planar one. The study of the trends in the 7 Li magnetic shielding isotropy, σiso, and anisotropies, Δσ, values are explained in terms of the interplay between the electronic and geometrical effects. The variations in the 7 Li nuclear quadrupole coupling constants, χ, and their associated asymmetry parameters, ηQ, for different isomers of the lithium hydride clusters and the influence of hydrogenation on the EFG tensors are also discussed. For n = 4, we obtained a noticeable difference in the χ value from the planar to the three-dimensional structures. The atoms in molecules (AIM) analysis at the Li–H bond critical point reveals remarkably different topographical properties of the charge density and associated Laplacian fields for the planar and three-dimensional lithium hydride clusters.

ESR Microscopic Imaging with Microfabricated Field Gradient Coils

1987 ◽  
Vol 26 (Part 2, No. 6) ◽  
pp. L929-L931 ◽  
Author(s):  
Motoji Ikeya ◽  
Toshikatsu Miki
Keyword(s):  
Field Gradient ◽  
Gradient Coils ◽  
Microscopic Imaging
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