Saturation Control in RHIC DipolesVariation in (m-1)/(m+1) in Iron Yoke
Better to examine (m-1)/(m+1) instead of |B|. It appears more in formula, e.g.
and provides a better scale to compare (see pictures above).
Compare the azimuthal variation in (m-1)/(m+1) with and without saturation control holes, particularly near the yoke inner surface. A more uniform iron magnetization reduces saturation induced harmonics.