Generation of intense magnetic fields with high homogeneity

Various arrangements and geometries of air-core solenoids were investigated with a view to designing magnetic standards capable of producing magnetic fields in the range of 20-25 kG with a field homogeneity of 1 in 10⁵ or better over a spherical volume of 1-in diameter. An analysis based on the method of zonal harmonics is presented. The effect of different coil geometries on field intensity and homogeneity is studied. In the case of the two-coil system, the effect of coil separation on field homogeneity is examined for various coil geometries. The method of adding compensating windings to the cylindrical solenoid for improving the field homogeneity is also investigated. The field homogeneity figures are computed for certain coil arrangements. The severe problem of cooling high-powered air-core solenoids is examined