This page is abridged from the full SIMION "Supplemental Documentation" (Help file). The following additional sections can be found in the full version of this page accessible via the "Help > Supplemental Documentation" menu in SIMION 8.1.1 or above:
  • Links to all Examples


Below are many screenshots from SIMION.

General Features


SIMION main menu.


SIMION Modify geometry screen showing exit section of quadrupole.


SIMION Modify geometry screen showing ion trap.


Fast adjust voltages on electrodes.


Refining geometry (solving electric field).


Geometry file (GEM) compilation.


SL Tools utility with CAD conversion and PA import/export functions. See also SL Tools Tutorial.


Image annotation screen (before printing).


Print/image export options screen.

Einzel Lens Example


Einzel lens geometry (three cylindrical lenses).


Equipotential lines showing electric field.


Particles flying through lens.

See also A Tour of the SIMION Demo and Lens.

Buncher Lens Example


Buncher lens example (“buncher”). The problem is to slow a packet of ions so that they converge in time. The trick is to have them decelerate in a linear field and then (when they are in the middle of it) chop the field to zero. Thus the leading ions will be going slower than the trailing ions and they will bunch together at some point down stream.

Ions in flight, along with a trace of times of ion splats against the electrode. Notice that ion splat times are near identical, as desired in an ion buncher.

RF Quadrupole Example

For additional information, see Quadrupole Mass Filter.


SIMION Modify geometry screen showing exit section of quadrupole.


Fast adjust voltages on electrodes.


Refining potential array.


Cut inside quadrupole to see trajectories.


Workbench definition size.


List of PA instances in workbench.


Potential energy surface.


Particle flying.


Particle flying, side view.


Define particle initial conditions.


More complex example of defining particle initial conditions.


Data recording screen.


Equipotential lines in quadrupole.


Potential energy surface of quadrupole.


Undulating potential energy surface of ion trap with ions flying as dots.


Time of flight example showing data recording results in Log window.


User adjustable variables in quadrupole example.

For additional examples, refer to the SIMION 2020 Supplemental Documentation.

RF Quadrupole Ion Trap Example


SIMION Modify geometry screen showing 3D quadrupole ion trap.


3D quadrupole ion trap, with adjustable variables.


3D quadrupole ion trap, potential energy view.


3D quadrupole ion trap, particle motion (showing heavy ions in largest shell).

See also Paul Trap.

Time of Flight Example


3D view of time of flight system.


Cutway to see particle inside reflectron.


PE view of reflectron.


TOF particle definitions.

See also Time of Flight

Lens Tuning Example


SIMION “tune” example, showing a user program to tune a lens. A simple three element fast adjust lens is provided for tuning. The middle electrode is adjusted via user program. This should serve as a simple example of how tuning problems might be approached.

See also Optimization.