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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.

Restrictions:
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