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Manuscript Title: MULTI-fs - A Computer Code for Laser-Plasma Interaction in the Femtosecond Regime
Authors: R. Ramis, K. Eidmann, J. Meyer-ter-Vehn, S. Hüller
Program title: MULTI-fs
Catalogue identifier: AEKT_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 183(2012)637
Programming language: FORTRAN.
Computer: PC (32 bits and 64 bits architecture).
Operating system: Linux/Unix.
RAM: 1.6 MiB
Keywords: Laser and VUV Light Absorption in Warm Dense Matter, Radiation Transport, Computational Methods in Gas Dynamics, Short Pulse Laser Interaction.
PACS: 47.11.-j, 47.70.Mc, 52.20.Fs, 52.38.Dx.
Classification: 19.13, 21.2.

Subprograms used:
Cat Id Title Reference
AECV_v1_0 MULTI2D CPC 180(2009)977

Nature of problem:
One dimensional interaction of intense ultrashort (subpicosecond) and ultraintense (up to 1017 W cm-2) laser beams with matter.

Solution method:
The hydrodynamic motion coupled to laser propagation and several transport mechanisms is solved in one-dimensional geometry using a fractional step scheme. Fluid motion together with heat diffusion is solved by using an implicit Lagrangian method. Transport by thermal conduction and radiation as well as electron-ion energy transfer are treated in a two-temperature (electron and ion) model covering the wide range from solid state to high temperature plasma. Laser propagation is calculated from the one-dimensional Maxwell equations. Radiation transfer is solved by using the forward-reverse method for a discrete number of frequency groups. Matter properties are interpolated from tables (equations-of-state, ionization, opacities, and emissivities) generated by external codes. An alternative WKB laser deposition package is available to be used for long pulse lasers.

The code has been designed for typical conditions prevailing in short pulse (fs-ps time scale) laser-matter interactions at moderate intensities (1012-1017 W cm-2). Although a wider range of situations can be treated, extrapolations to regions beyond this design range need special care.

Additional comments:
A graphical post processor is included in the package. Its use requires the previous installation of code MULTI2D (see "Subprograms used" above)

Running time:
4.8 seconds for the example supplied