The Measurement of Two-Dimensional Fields. Part II: Study of a Quadrupole Magnet

Abstract

The characteristics of a dc quadrupole magnet have been measured using some of the techniques for measuring two‐dimensional fields and gradients proposed by W. C. Elmore and M. W. Garrett in the preceding paper. Saturation curves and measurements of the flux distribution in the magnet are presented. The characteristics of the magnet have been determined both in the interior and in the fringing region at each end. It is shown that by using a pole tip of circular cross section and correctly chosen radius it is possible to produce a magnetic field with gradient constant to ±1 percent out to 0.8 of the radius of the gap.