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Manuscript Title: ELENDIF: a time-dependent Boltzmann solver for partially ionized plasmas.
Authors: W.L. Morgan, B.M. Penetrante
Program title: ELENDIF77
Catalogue identifier: ABLX_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 58(1990)127
Programming language: Fortran.
Computer: CRAY X-MP.
Operating system: NLTSS, VMS, UNIX, MAC OS, DOS.
Keywords: Boltzmann equation, Electron distribution, Transport coeffcients, Physics laser, Plasma physics, Gas discharges, Kinetic model.
Classification: 19.8, 19.11.

Nature of problem:
ELENDIF calculates the time evolution of the electron energy distribution function in a mixture of partially ionized gases with or without an applied electric field. The code can treat inelastic and superelastic processes, electron-electron and electron-ion collisions, photon-electron (free-free) processes, attachment and recombination, ionization including a distribution of secondary electrons, and an external source of electrons (e.g. an electron beam). The code also computes the mean electron energy, drift velocity, diffusion coefficient, rate coefficients and energy flow rates for the processes being included in the calculation.

Solution method:
ELENDIF solves the time-dependent Boltzmann transport equation in terms of the electron number density. By finite-differencing the electron energy axis, the Boltzmann equation is transformed into a finite set of coupled differential equations for the electron number density at each energy grid as a function of time. The matrix of densities is then evolved forward in time using a combination of explicit and implicit methods. The electron energy distribution is then convolved with the cross section to provide the transport coefficients, collisional rates and energy flow rates.

Restrictions:
It is assumed in the formulation of ELENDIF that the two-term spherical harmonic expansion of the electron distribution function is adequate.

Running time:
On the Vax 8650 the code takes 0.11 seconds per timestep if the effects of electron-electron collisions are ignored, and 0.46 seconds per timestep if electron-electron collisions are included.