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Manuscript Title: HEIZ: a program to estimate temperature modifications in laser plasma interaction experiments by inverse bremsstrahlung absorption and classical heat conduction.
Authors: B. Gellert, J. Handke
Program title: HEIZ
Catalogue identifier: ACES_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 30(1983)169
Programming language: Fortran.
Computer: CDC 175.
Operating system: NOS.
RAM: 26K words
Word size: 6
Peripherals: graph plotter.
Keywords: Laser physics, Plasma interaction, Inverse bremsstrahlung, Heat conduction.
Classification: 15.

Nature of problem:
In order to overcome the lack of knowledge of several authors engaged in laser plasma interaction experiments about the modification of an underdense plasma due to high power laser irradiation, a simple model was set up. The predictions of this model could be proved by several independent experiments. The principle idea is that heating by inverse bremsstrahlung absorption is balanced by classical heat conduction out of the interaction zone.

Solution method:
Apart from an analytical recursion, only lowest order explicit Runge- Kutta methods are used for the solution of the corresponding differential equations.

Restrictions:
The 1-dimensional model assumes a homogeneous, extended plasma slab, and a homogeneous temperature distribution, before the laser is incident. The program is written for the CO2-laser (lambda=10.6 mu m). Parametric processes and further non-linear mechanisms are not taken into account. Electron quiver velocity should not exceed 6 times electron thermal velocity.

Unusual features:
If plots are wished, subroutine MALEN makes use of FOPLOT graphics commands. For different graphics systems, MALEN can easily be replaced by any user supplied plotting routine.

Running time:
7.5 sfor the test run.