SIMION®
The field and particle trajectory simulator
Industry standard charged particle optics software
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SIMION v8.1.3.1-TEST posted - EA with new GEM features!
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SIMION 8.0 Issues/Bugs/Enhancements

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Issue I440 [80,defect,fly2,resolved]
  KE precision error when defining very low speed or momentum in FLY2.

  Prior to 8.0.4-TEST16, if in FLY2 file "velocity format" was defined
  as "direction+speed" and v/c was small (< about 10^-7), where v is particle
  speed and c is speed of light, then particle KE can be off significantly
  (> about 3%).  The FLY2 code was using a full relativistic calculation
  for converting speed to KE, and that calculation lacked numerical precision
  at very low v/c.  This defect does not affect other parts of SIMION
  (e.g. speed_to_ke function).  As of 8.0.4-TEST16, the FLY2 code uses
  the built-in speed_to_ke function, which doesn't have this precision problem.

  Similarly, prior to 8.0.4-TEST14, if in FLY2 file "velocity format" was defined
  as "direction+momentum" and momentum/mass was small (< about 10^-4), where
  momentum in units of MeV/c and mass in units of u,
  then particle KE can be off significantly (> about 1%).

  Affects 8.0.0-8.0.4-TEST15.
  Resolved in 8.0.4-TEST16.

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