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Key features
- FEM can use large meshes both to define the geometry of the problem
(up to 100x100 coarse mesh lines) and large fine mesh (up to 200000
mesh points).
- Graphical user interface allows the user to generate and modify the
geometry of the problem. It also automatically generates a fine mesh with
smoothly graded mesh step. All data are input on easy-to-understand
menus. The interface generates a correct data file for the FEM
computation. The outputs of the computation can be displayed with the
interface, copied as standard Windows
bitmaps or output to HPGL files, that can be easily used to generate
documentation.
- The programs for the computation of electron optical properties,
each of them equipped with its own user interface, provide paraxial
properties, 1st order chromatic and 3rd order geometrical
aberrations.
- Ray tracing programs solve the 3D equation of motion of charged
particles in numerically computed fields. They are general enough to
calculate paths of any charged particle and accurate enough to obtain
aberrations of arbitrary order.
Specific capabilities
- Very fast solution of FEM equations
- With our ICCG method we can solve 200000 equations in about a minute
on 1 GHz PC. The program itself needs less than 32 MB RAM to do such a
computation!
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- Very high accuracy of FEM results
- Optimum potential for each of the problem is
selected providing the best accuracy of potential and axial field.
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- Graphical user interfaces
- The user interface relieves the user of typing in a lot of numbers:
it is easy to add extra lines, move points or lines or rotate a line,
straighten a line connecting two points, specify all inputs like
excitations.
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- Additional graphics
- The user can with the help of SGPLOT
program display the contours of the lens or deflector (generated by
the graphical interface) and the axial field. The interfaces produce
outputs in HPGL format, that can be loaded into MS Word®, CorelDraw®
or into auxiliary programs like SPLOT®.
The scheme of interlinked programs within the MLD package. The programs in
blue are user interfaces running in DOS window, the programs in red are
computation programs written in Fortran (32-bit Windows executables), SGPlot is
an auxiliary 2D graphics program.
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