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摘要
The code MULTI-fs is a numerical tool devoted to the study of the interaction of ultrashort sub-picosecond laser pulses with matter in the intensity range from 10(11) to 10(17) W cm(-2). Hydrodynamics is solved in one-dimensional geometry together with laser energy deposition and transport by thermal conduction and radiation. In contrast to long nanosecond pulses, short pulses generate steep gradient plasmas with typical scale lengths in the order of the laser wavelength and smaller. Under these conditions. Maxwell%26apos;s equations are solved explicitly to obtain the light field. Concerning laser absorption, two different models for the electron-ion collision frequency are implemented to cover the regime of warm dense matter between high-temperature plasma and solid matter and also interaction with short-wave-length (VUV) light. MULTI-fs code is based on the MULTI radiation-hydrodynamic code [R. Ramis, R. Schmalz, J. Meyerter-Vehn, Comp. Phys. Comm. 49 (1988) 475] and most of the original features for the treatment of radiation are maintained. %26lt;br%26gt;Program summary %26lt;br%26gt;Program title: MULTI-fs %26lt;br%26gt;Catalogue identifier: AEKT_v1_0 %26lt;br%26gt;Program summary URL: http://cpc.cs.qub.ac.uk/summaries/AEKT_v1_0.html %26lt;br%26gt;Program obtainable from: CPC Program Library, Queen%26apos;s University, Belfast. N. Ireland %26lt;br%26gt;Licensing provisions: Standard CPC licence, http://cpc.cs.qub.ac.uk/licence/licence.html %26lt;br%26gt;No. of lines in distributed program, including test data, etc.: 49 598 %26lt;br%26gt;No. of bytes in distributed program, including test data, etc.: 443 771 %26lt;br%26gt;Distribution format: tar.gz %26lt;br%26gt;Programming language: FORTRAN %26lt;br%26gt;Computer: PC (32 bits and 64 bits architecture) %26lt;br%26gt;Operating system: Linux/Unix %26lt;br%26gt;RAM: 1.6 MiB %26lt;br%26gt;Classification: 19.13, 21.2 %26lt;br%26gt;Subprograms used: Cat Id: AECV_v1_0; Title: MULTI2D; Reference: CPC 180 (2009) 977 %26lt;br%26gt;Nature of problem: One-dimensional interaction of intense ultrashort (sub-picosecond) and ultraintense (up to 10(17) W cm(-2)) laser beams with matter. %26lt;br%26gt;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. %26lt;br%26gt;Restrictions: The code has been designed for typical conditions prevailing in short pulse (fs-ps time scale) laser-matter interactions at moderate intensities (10(12)-10(17) W cm(-2)). Although a wider range of situations can be treated, extrapolations to regions beyond this design range need special care. %26lt;br%26gt;Additional comments: A graphical post processor is included in the package. Its use requires the previous installation of code MULTI2D (see %26quot;Subprograms used%26quot; above). %26lt;br%26gt;Running time: 4.8 seconds for the example supplied.
- 出版日期2012-3
