Field Inhomogeneities of a Betatron Magnet

概要

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Field inhomogeneities of a betatron with H type magnet are investigated with peaking strip and search coil methods. A new formula estimating the time lag between the field applied externally and the corresponding induction is given theoretically as a function of various parameters of the magnet and the magnetic materials in the magnet. The field inhomogeneities are discussed on the basis of this formula and explained as mainly due to inhomogeneities of angles ψ between magnetic paths and laminations in the magnet. The angle is attended with a large time lag and an effective thickness of the lamination in the pole piece may be considerably large at least at low field. The upper limit of the angle ψ may be estimated to be of the order of d_s(γ)/L_s, where d_s(γ) is the thickness of the sector at a radius γ, and L_s the length along the magnetic path of the sector.
社団法人応用物理学会の論文
1962-12-15