Mar 1, 2012

Wire mesh grid simulation in Simion



Tof + voltage deflector + Einzel lens.
Elements are intentially placed closer to each other to let see the finer details of the elements.


Preface:
http://simion.com/info/grid.html

We want to compare the differences in electric field distortion between wire mesh plates and single-hole plates as voltage plates in our TOF mass spectrometer. The electric field can be simulated a program called Simion.

Ions accelerated by hole plates suffers a focusing effect (beam expansion):

Ions accelerated by mesh grid wires has 'less' focusing effect (trajectories are more parallel):


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Tof acceleration plates plus a voltage deflector, for steering the direction of the ion beam.
Another view.


Fine grid voltage mesh simulation, CF a hole voltage plate.

Potential contour details showing the distortions of electric field near the fine metal wires:
The vertical lines are the ions coming from top. Horizontal contours are the potential energy lines.

Simion 7 3D problems:
1. Directories in C:/Documents and settings/The One/ are not listed completely in directory tree window, even after the scan action performs. There is a warning on top of the file manage window saying "Warning, files nested too deep". Did not find a cure in the manual in the first try. Hope someone can help.