**Scientific software description**

**"DISTREL"**

**The package is intended
for quick calculation of the electron energy distribution function and
correspondent collisional rate coefficients in the gas-discharge or electron
beam formed plasma under arbitrary non-stationary conditions. Calculations
are based on the Boltzmann equation. Original, effective and quick numerical
methods are developed.**

**A physical model takes
into account the following processes: heating of electrons by electric
field, high-voltage beam heating of electrons and creation of the secondary
electrons, electron-electron collisions, elastic, inelastic and superelastic
electron-atomic collisions, recombination, attachment and a number of other
processes. Each of them may be turned on/off by means of a start
menu.**

**Arbitrary set of active
particle types may be taken into consideration. The distribution function
may be calculated in accordance with the kinetics of population densities,
determined basing on the real rate coefficients.**

**The package may be used
for the electron distribution function and electron transport coefficients
analysis in any physical situation - independently, or as a subroutine
for other plasma simulation program (see NIKIN-B
package description). The package provides useful graphical representation
of the distribution function time evolution.**

** Scientific software
discription**

** "DEGREL"**

**The package is intended
for a quick calculation of the electron energy distribution function, formed
as a result of energy degradation process, initiated by electron beam or
other high-speed particle beam propagation through a gas mixture.**

**The energy distribution
function is derived from so called "Degradation Equation". A new
effective and reliable numerical method is developed to solve this equation.
PC run time in case of electron degradation in argon is about 1 sec only
for IBM PC /486, with exact particle number and total energy conservation.**

**The program may be used
for determination and investigation of any beam formed plasma characteristics
- independently, or as a subroutine.**