Effect of Fringe Fields for a Bending (Dipole) Magnet on Field Integral?

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    Bending Fringe Magnet
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SUMMARY

This discussion focuses on the modeling of a bending magnet using FEMM for magnetic spectrometry, specifically examining the impact of fringe fields on the field integral ∫B ds. The initial model considered a hard edge scenario without fringe fields, while subsequent analysis included these fields. The consensus is that the field integral decreases when fringe fields are incorporated, as the normal B field diminishes with an extended path length into the fringe regions.

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  • FEMM (Finite Element Method Magnetics) software proficiency
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  • Knowledge of bending magnet design principles
  • Familiarity with fringe field effects in magnetism
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rubixx14
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I'm doing some modeling of a bending magnet in FEMM, to use as a magnetic spectrometer, and came across the following equation:
Energy_spectrometer_equation_cropped.png

with the setup of the magnetic spectrometer similar to the following figure:
Energy_spectrometer_figure.png

At first I modeled a hard edge scenario in a 2D cross section, where no fringe fields had been considered, and then I began to look at adding the fringe fields. My question relates to the field integral of ∫B ds and how it changes (does it increase or decrease?) when you add in the fringe fields? My initial thinking is that the integral would decrease, since the normal B field I acquired from my model decreased when I extended the path length out to include the fringe regions, but I'm not entirely confident on my conclusion.
 

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