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Several papers about FLUKA are available on-line at http://www.slac.stanford.edu/esh/rp/docs/FLUKA/papers/bibliography.html
The authors of the present FLUKA version are Alberto Fasso (at SLAC or at CERN), Alfredo Ferrari, Johannes Ranft, and Paola Sala.
The program can be obtained by sending a request, for example, to Alberto Fasso or Stefan Roesler. Please indicate on which computer platform you plan to use it. Following is a description of the program.
FLUKA is an integrated, versatile multiparticle Monte Carlo program, capable of handling a wide variety of radiation transport problems, including activation and shielding of proton and electron accelerators of any energy. Versions are available for various UNIX platforms, VAX-VMS/OpenVMS, and Linux.
FLUKA can simulate, with high accuracy, the interaction and propagation in matter of about 60 different particles, including neutrons from thermal energies to about 20 TeV, gammas and electrons from 1 keV to thousands of TeV, muons of any energy, protons, mesons, neutrinos, and all the corresponding antiparticles. It can handle even very complex geometries, using an improved version of the well-known combinatorial geometry (CG) package. The FLUKA CG is faster, more flexible, and more user-friendly, and it has been designed to track charged particles correctly (even in the presence of magnetic or electric fields). Various visualization and debugging tools are also available.
The FLUKA hadron-nucleon interaction models are based on resonance production and decay below a few GeV, and on the Dual Parton model. Two models are used also in hadron-nucleus interactions. At momenta below 3-5 GeV/c, the PEANUT package includes a very detailed generalized intranuclear cascade (GINC) and a pre-equilibrium stage, while at high energies the Gribov-Glauber multiple collision mechanism is included in a less-refined GINC. Both modules are followed by equilibrium processes: evaporation, fission, Fermi break-up, and gamma de-excitation. FLUKA can also simulate photonuclear interactions (described by vector meson dominance, delta resonance, and quasideuteron and giant dipole resonance) and can do fully integrated photon-neutron coupled calculations.
An original treatment of multiple coulomb scattering and of ionization fluctuations allows the code to handle accurately some challenging problems, such as electron backscattering and energy deposition in thin layers, even in the few keV energy range. The program can also transport polarized photons (e.g., synchrotron radiation) and optical photons.
For neutrons with energy lower than 20 MeV, FLUKA uses its own neutron cross-section library (P5 Legendre angular expansion, 72 neutron energy groups), containing more than 60 different materials selected for their interest to physics, dosimetry, and accelerator engineering and derived from the most recently evaluated data. Neutron energy deposition is calculated by means of kerma factors; however, recoil protons and protons from N(n,p) reactions are transported explicitly.
For most applications, no programming is required of the user. However, a number of user interface routines (in Fortran 77) are available for users with special requirements.
In fully analog mode, FLUKA can be used in radiation detector studies to predict fluctuations, coincidences, and anticoincidences. On the other hand, deep-penetration shielding calculations are made possible by several available variance reduction techniques. Other current applications include photon, electron, and proton radiotherapy; boron neutron-capture therapy; prediction of activation and radiation damage at proton and electron accelerators; aircrew and space dosimetry; cosmic ray studies; calculation of fluence-to-dose conversion coefficients; and design of high-energy physics experiments and accelerator-driven subcritical systems (such as energy amplifiers and waste transmutation).