Low energy electron beam radial propagation through gases and foils
Monte Carlo trajectories

Low energy electron beam radial propagation through gases and foils
 

Scientific software description

"BEAM"

The package is intended for numerical simulation of the electron beam propagation through foils, vacuum or arbitrary gas mixture filled chambers (lasers and so on), having any complex shape and in the presence of electric and magnetic fields of any configuration. Besides, the package may be used for the calculation of electron transport parameters for any compound matter.

Calculations are based upon Monte Carlo trajectory method. While program running, all real successive collisions  of electrons with atoms are simulated, such as scattering due to elastic impact, excitation and ionization  or "delta"-electron creation.  Corresponding energy losses and scattering angles are determined from appropriate differential collisional cross-sections.  High energy secondary electrons (i.e. "delta"-electrons) motion is considered in a similar way.

Three-dimensional tracks of moving particles can be displayed on the chamber's cuts background  (for two orthogonal projections) as an illustration and for the brief qualitative analysis.

After program has finished the following statistical characteristics of the process are reported: angular and energy distributions of passed electrons, spatial distribution of energy deposited in the chamber volume, fractions of passed, reflected and stopped particles, their energies, etc.

An accuracy of obtained statistical results depends on the total amount of considered trajectories (i.e. injected test particles). It takes about 0.5 second with IBM PC /486 to trace a full path in matter for electron with initial energy about 500 keV. It is possible to save the intermediate results on the disk and run program again from the frozen point any time later.

An arbitrary compound matter (gas mixture, foil, etc.), formed of any chemical elements, may be taken into consideration. The program automatically derives all necessary medium characteristics from chemical formulae for components defined in ordinary text form.
 
Click here to download FoilTrans demo program
 
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