A typical axially compact, square window core steering magnet has a very small 2D good field region (GFR) of 18% of the iron core aperture. It is weak with 85% of its dipole in the fringes. Increasing the current fed area (coil) to increase the dipole strength lowers the good field zone. Some novel and simple coil shapes can expand their 2D/3D GFR to 94/40% of the iron aperture. They are axially compact, i.e., stronger with 60–65% of the dipole in fringes. The reduction in error sextupole field is more profound. A novel 2D coil shape with vanished 2D sextupole proves the concept. For axially short cores, a gap between the coil and the iron aperture can increase the 3D sextupole, missing in 2D simulations. A new asymmetric one-axis steering magnet core and coil shape with high dipole field and homogeneity is also given. The new, practical coil shapes significantly improve the dipole field homogeneity and strength of these magnets.

中文翻译：

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具有均匀偶极场的紧凑而坚固的窗芯转向磁铁

典型的轴向紧凑方形窗芯转向磁铁具有非常小的 2D 良场区域 (GFR)，仅为铁芯孔径的 18%。它很弱，其偶极子的 85% 位于边缘。增加电流馈电面积（线圈）以增加偶极子强度会降低良场区。一些新颖简单的线圈形状可以将它们的 2D/3D GFR 扩展到铁孔径的 94/40%。它们在轴向上是紧凑的，即更强，60-65% 的偶极子在边缘。误差六极场的减少更为深刻。具有消失的 2D 六极杆的新型 2D 线圈形状证明了这一概念。对于轴向较短的磁芯，线圈和铁孔之间的间隙会增加 3D 六极杆，这在 2D 模拟中是缺失的。还给出了具有高偶极场和均匀性的新型非对称单轴转向磁芯和线圈形状。新的，