From SIMION
A uniform magnetic field (with no fringing effects) is easy to input into SIMION via a mangetic PA file (e.g. p.2-10 of the SIMION 7.0 manual) or via an mfield_adjust segment in a user program attached to an empty magnetic PA file (e.g. p. I-28 of the SIMION 7.0 manual). However, a real solenoid has fringing effects (non-uniform fields), especially near the two solenoid ends.
As of SIMION 8.0.3, calculation of magnetic fields from wire currents (including air-core solenoids) is supported via a Biot-Savart magnetic field calculation. See Issue 287 (http://www.simion.com/issue/287).
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See Also
- Importing a solenoid magnetic field into SIMION by multiple methods (http://www.simion.com/docs/solenoid.html). Various approaches to importing solenoid magnetic fields (warning: This article is older, before Biot-Savart calculations were implemented in SIMION).
- Magnets

